The standard advice about Nepal trekking is to avoid the monsoon. Go in October, go in March — that's what most guides say, and for the Annapurna Circuit, the Langtang Valley, and the standard Everest Base Camp route, that advice is sound. The southern flanks of the Himalaya receive 1,500 to 3,000 millimetres of rainfall between June and September. Trails turn to mud. Leeches emerge in the forest. Mountain views disappear behind cloud for days at a stretch.
But Nepal is not a single landscape and the monsoon is not uniform. The same Himalayan range that catches all that moisture on its southern face acts as a barrier that blocks it from crossing north. The high plateau regions beyond the main ridgeline — the ancient Tibetan borderlands of Upper Mustang, Dolpo, Nar Phu, and Tsum Valley, along with the upper reaches of the Khumbu — sit in a geographic rain shadow that receives little to none of the monsoon rainfall battering the trails to their south. These areas have distinct character: stark canyon walls in shades of ochre and red, whitewashed gompas above wide valleys, yak pastures under open sky. And from June to September, when the popular trekking routes are at their most uncomfortable, these places are walkable, relatively clear, and almost entirely free of other trekkers.
This guide covers the five best monsoon trekking trails in Nepal that stay dry through the rainy season, explaining the geography behind each, what the walking involves, the permits required, and the best months to go. For a full overview of Nepal's trekking regions, see our Annapurna trekking guide and Everest region trekking guide for the post-monsoon alternatives.
Why Some Trails Stay Dry: The Rain Shadow Explained
Trail 2: Dolpo Trek (Lower and Upper)
Trail 5: Upper Khumbu and Gokyo Lakes
Trail Comparison: Difficulty, Duration and Permits
What to Expect Trekking Nepal in Monsoon
What to Pack for Monsoon Trekking in Nepal
Nepal's monsoon is driven by moisture-laden air that sweeps north from the Bay of Bengal each June. As this air mass hits the main Himalayan barrier — a wall of 7,000 to 8,800 metre peaks running east to west — it is forced upward, cools rapidly, and drops the majority of its moisture on the southern slopes. By the time any remaining air crosses to the northern side, it has lost most of its precipitation potential. The result is a dramatic rainfall gradient: Pokhara, on the southern side, averages around 400mm of rainfall in July alone. Lo Manthang in Upper Mustang, sitting north of the Annapurna-Dhaulagiri corridor just 80 kilometres away as the crow flies, receives closer to 40mm across the entire monsoon season.
This is not weather luck. It is consistent, predictable geography that makes specific northern valleys genuinely viable for trekking in months when the standard trails are at their worst. Trekking operators who understand this pattern run regular monsoon departures to these regions every year. The terrain, the accommodation, and the experience are different from anything the standard October or March trekker encounters.
Not every rain-shadow region is equally dry. Upper Mustang and Dolpo offer the strongest rain-shadow protection. Nar Phu and Tsum Valley receive somewhat more precipitation but still dramatically less than their south-facing counterparts, and the walking and cultural experience they offer make the occasional rain shower a worthwhile trade-off. Upper Khumbu at altitude also stays workable through August, though with more variable cloud than the far-north plateau regions.
Upper Mustang is Nepal's most celebrated monsoon trekking destination and for good reason. The former Kingdom of Lo sits on a high plateau north of the Annapurna-Dhaulagiri Himalayan barrier at elevations between 2,800 and 4,200 metres, in a landscape so geographically and culturally distinct from the rest of Nepal that it feels like a separate country — which, until 1992, it effectively was.
The terrain is pure Tibetan plateau: eroded canyon walls in deep red and ochre, flat-roofed villages of whitewashed mud brick, ancient cave monasteries carved directly into cliff faces, and wide valley floors under open sky. The walking routes follow the Kali Gandaki River north from Kagbeni through Chele, Syangboche, Ghami, and Tsarang before reaching Lo Manthang, the walled capital that was the seat of the Lo kings for over 500 years.
A standard Upper Mustang trek takes 12 to 14 days from Pokhara, including two days of road driving through the Annapurna Conservation Area to reach Kagbeni, then eight to ten days of actual walking in the restricted zone. The route is non-technical: there is no high pass above 4,500 metres and no glacier crossing. This makes it accessible to fit trekkers without high-altitude mountaineering experience. Daily walking stages average five to seven hours on good trails. Teahouse accommodation is available throughout, though lodges are simpler than on the Annapurna or Everest main routes.
The rainfall statistics tell the essential story. During July, most of Nepal is being rained on heavily. Upper Mustang records less than 50mm of precipitation for the entire month. Skies are frequently blue, the canyon walls photograph brilliantly in summer light, and wildflowers are in full bloom in the side valleys. The one caveat: morning cloud does build in the Kali Gandaki valley in afternoon hours, and occasional brief showers are possible even in the driest years. But "possible showers" in Mustang is not remotely comparable to "monsoon trekking" on the Annapurna Circuit.
Restricted Area Permit required: USD 500 per person for the first 10 days, USD 50 per additional day. Annapurna Conservation Area Permit (ACAP) also required. Both must be arranged through a registered Nepalese trekking agency. See our Upper Mustang Tiji Festival Trek for a monsoon-season departure that combines the trek with the most important festival in the Lo calendar, typically falling in May or early June.
Best monsoon months for Upper Mustang: June and September are ideal, with July and August also very viable. The Tiji Festival in Lo Manthang falls in May or early June depending on the Tibetan lunar calendar, making late May to June the most culturally rewarding period.
If Upper Mustang is Nepal's best-known monsoon trek, Dolpo is its most remote. Located in western Nepal north of the Dhaulagiri massif, Dolpo encompasses Lower Dolpo — a rugged but accessible walking region centred on Phoksundo Lake and Ringmo village — and Upper Dolpo, the restricted inner plateau that was the setting for Eric Valli's film Himalaya and remains one of the least visited trekking destinations in Asia.
The landscape is extraordinary by any measure. Shey Phoksundo National Park protects the region's high-altitude ecosystem, including snow leopard habitat, Himalayan wolf, blue sheep, and Tibetan gazelle. Phoksundo Lake, at 3,611 metres, is the deepest lake in Nepal and one of the most visually dramatic — turquoise water against scree slopes and pine forest, reached after a three to four day walk from the roadhead at Dunai. The ancient Bon monastery at Shey Gompa, in Upper Dolpo at 4,200 metres, is one of the oldest continuously functioning monasteries in the Himalayan region.
Lower Dolpo is accessible without a restricted area permit, though still requiring the Shey Phoksundo National Park entry fee and standard trekking permits. Upper Dolpo requires a restricted area permit costing USD 500 per person for 10 days, the same structure as Upper Mustang. The terrain in Upper Dolpo is significantly more demanding than Mustang: several passes above 5,000 metres are crossed, camping is required in many sections, and a full Upper Dolpo circuit takes 20 to 25 days. This is an experienced trekkers' route that should be undertaken with a professional guide and full camping support.
The rain shadow in Dolpo is as strong as in Mustang. Jumlans and the Dolpo plateau sit north of Dhaulagiri's massive barrier and receive minimal monsoon rainfall. The Phoksundo Lake area, positioned slightly further south, receives some rainfall in July and August but far less than the standard trekking zones.
Best monsoon months for Dolpo: Late June through August for both Lower and Upper sections. September opens the door to combining Dolpo with the start of the autumn season if route flexibility allows. Access is either by road from Nepalgunj via Dunai (Lower Dolpo) or by charter flight to Juphal, which makes logistics dependent on aircraft availability — another reason to work with an experienced local operator.
Nar Phu Valley sits immediately north of the Annapurna range, accessed via a side valley off the Annapurna Circuit route near Koto. For most of the 20th century it was entirely closed to outsiders; even after Nepal opened it as a restricted trekking area in 2002, fewer than 500 trekkers walk the valley in any given year. The monsoon season, when virtually all of those trekkers avoid it in favour of dry weather elsewhere, reduces that number to a handful.
What those few find is a valley of exceptional character. The villages of Nar and Phu are among Nepal's most intact high-altitude Tibetan communities, with traditional architecture, active monasteries, and a Tibetan-speaking population that has maintained its cultural practices largely unchanged for centuries. The terrain shifts from rhododendron forest in the lower sections — wetter and greener in monsoon than at any other time of year — to open plateau grassland around Nar village at 4,100 metres, where the rain shadow becomes fully effective and the skies clear.
The standard Nar Phu circuit takes 10 to 14 days and is most commonly combined with the Annapurna Circuit, creating an extended route of 20-plus days that takes in both the rain-shadow plateau of Nar Phu and the post-monsoon Annapurna crossing in September and October. For purely monsoon season walking, the Nar Phu section offers the best conditions: the lower Annapurna Circuit sections that connect Besisahar with Koto remain monsoon-wet, but from Koto northward into the restricted valley the landscape transitions rapidly to drier Tibetan plateau conditions.
Camping is required in parts of Nar Phu where teahouse accommodation is unavailable. A restricted area permit costs NPR 3,500 per week per person and a Manang and Mustang special permit must accompany it. As with all restricted area treks, a minimum of two trekkers is required per group and a licensed guide is mandatory — solo independent trekking is not permitted.
Best monsoon months for Nar Phu: July and August in the upper valley. The crossing to Nar from Koto involves a section of trail that can be muddy in heavy rain years; June and September are marginally drier at the lower elevations. For a combined Nar Phu and Annapurna Circuit route, aim for late August departure to hit the Thorong La pass crossing in early October optimal conditions.
Tsum Valley was opened to trekkers in 2008 and remains one of Nepal's least-visited restricted trekking areas. Located in the northern reaches of the Gorkha district, directly north of the Manaslu massif, it sits in a broad valley that runs toward the Tibetan border and is protected on its southern flank by the Ganesh Himal and Baudha Himal. This protection provides sufficient rain shadow during the monsoon to make it a realistic, if wetter than Mustang, option for July and August trekking.
Tsum Valley is sometimes described as a "hidden sanctuary" and that framing, while slightly worn from overuse, has genuine basis. The valley's population is ethnically Tsumba — a Tibetan-origin people whose isolation preserved a deeply conservative Buddhist culture with distinctly Tibetan art, architecture, and religious practice. Gompas like Mu Gompa and Rachen Gompa sit above the valley floor, the latter a functioning nunnery that welcomes trekking visitors. Mani walls, prayer flag strings, and chortens line the trails throughout.
The standard Tsum Valley trek runs 16 to 18 days from Arughat or Soti Khola and is commonly combined with the lower Manaslu Circuit route, which shares the same approach trail as far as Philim before the Tsum Valley branch heads north. The combination produces a 20 to 24 day itinerary that is one of the richer cultural treks in the entire Himalayan region. It should be noted that the Manaslu Circuit section south of Philim receives normal monsoon rainfall and should not be promoted as a dry-weather route — only the northern Tsum Valley section benefits from meaningful rain shadow protection.
Rainfall in Tsum Valley during July and August is higher than in Upper Mustang or Dolpo — expect occasional afternoon showers rather than the prolonged downpours of the southern routes — but significantly lower than Manaslu standard circuit and entirely manageable with appropriate waterproof gear. Trails stay in better condition than lower-elevation monsoon routes because the valley floor is wide, the gradient moderate, and teahouse accommodation solid enough that wet-weather walking has infrastructure support.
Permit requirements: Tsum Valley Restricted Area Permit (NPR 3,000 per week for the first four weeks, NPR 1,500 per week thereafter), plus Manaslu Conservation Area Permit (MCAP). Minimum group size of two trekkers with a licensed guide. Camping required in some upper valley sections.
Best monsoon months for Tsum Valley: July and August are viable, with June and September offering slightly drier lower-valley conditions. The combination of cultural richness and relative accessibility makes Tsum Valley the best monsoon option for trekkers who want a genuine high-altitude Himalayan experience without the longer duration and logistical complexity of Dolpo.
The Everest region is not a rain-shadow area in the same sense as Mustang or Dolpo, and the standard lower Khumbu trail from Lukla to Namche Bazaar receives genuine monsoon rainfall in July and August. But the upper Khumbu, above 4,500 metres, operates by different rules. At altitude, the monsoon cloud base often sits below the high valleys, and trekkers above it can spend entire days in sun while the lower Sagarmatha National Park is in cloud. This makes a targeted high-altitude itinerary focused on Gokyo Lakes and the Ngozumpa Glacier a surprisingly workable monsoon option for experienced acclimatised trekkers.
The Gokyo valley runs west of the main Everest approach, ending at Gokyo Lake at 4,750 metres and continuing to the Renjo La pass at 5,360 metres. In August, while Namche Bazaar sees afternoon rain and reduced visibility, the ridge above Gokyo frequently clears to give views of Everest, Lhotse, Makalu, Cho Oyu, and the full Ngozumpa Glacier — the longest glacier in the Himalaya outside Central Asia — under blue skies. The effect is temporary and not guaranteed, but experienced monsoon trekkers to Gokyo report far more clear-sky days than the lower-altitude Khumbu experience suggests is possible.
The trade-off is the approach. Lukla to Namche Bazaar takes two days of walking through lower forest that is genuinely wet in monsoon. Leeches are present below 3,500 metres. The trail above Namche through Dole and Machhermo to Gokyo improves steadily as altitude increases, and from Dole (4,040m) upward the monsoon cloud is frequently below the trekker rather than above. For those who can stomach two wet days in and two wet days out, the upper Gokyo circuit is a legitimate and often spectacular monsoon itinerary.
A direct helicopter approach from Kathmandu or Lukla to Namche Bazaar or higher eliminates the wet lower section entirely for trekkers whose budget allows it. Helicopter access to the Khumbu exists year-round and operates on fair-weather days even during the monsoon. Contact our team via www.getawaynepal.com for current helicopter availability on Khumbu monsoon departures.
Best monsoon months for Upper Khumbu: August is the most reliable month for altitude-based cloud inversion in the Khumbu. July is wetter at all elevations. September sees improving conditions from mid-month onward as the monsoon begins to break.
Upper Mustang: Moderate difficulty. 12 to 14 days from Pokhara. Max elevation 4,200m (Lo Manthang). Restricted Area Permit USD 500 for 10 days + ACAP. Monsoon suitability: Excellent — among the driest accessible trekking destinations in Nepal in July and August. Teahouse trekking throughout.
Dolpo (Lower): Moderate to challenging. 14 to 18 days from Nepalgunj or Juphal. Max elevation 5,190m (Numa La). No restricted area permit for Lower Dolpo section; Shey Phoksundo NP entry fee required. Monsoon suitability: Very good for the plateau sections north of Dunai. Some rainfall at lower elevations around Phoksundo.
Dolpo (Upper): Challenging to strenuous. 20 to 25 days. Max elevation above 5,000m on multiple passes. Restricted Area Permit USD 500 for 10 days. Camping required. Monsoon suitability: Excellent on the high plateau; requires experienced guides and full camping setup. Not suitable for independent or first-time trekkers.
Nar Phu Valley: Moderate to challenging. 10 to 14 days standalone; 20 to 25 days combined with Annapurna Circuit. Max elevation 5,320m (Kang La). Restricted Area Permit NPR 3,500 per week. Camping required in some sections. Monsoon suitability: Good above Koto in the restricted valley; lower approach sections receive some monsoon rainfall.
Tsum Valley: Moderate. 16 to 18 days from Soti Khola. Max elevation 4,000m (upper valley). Restricted Area Permit NPR 3,000 per week + MCAP. Monsoon suitability: Good in upper valley, with occasional afternoon showers rather than prolonged monsoon rainfall. Best combined with Manaslu lower approach for a full circuit.
Upper Khumbu / Gokyo: Moderate to challenging. 14 to 18 days from Kathmandu including flights. Max elevation 5,360m (Renjo La). Standard TIMS card and Sagarmatha National Park permit. Monsoon suitability: Variable — excellent above 4,500m in August when cloud inversion works in your favour; wet below 3,500m on approach and exit days.
On rain-shadow routes, the monsoon season delivers several advantages over the peak seasons that are rarely discussed in standard trekking guides.
Fewer trekkers. Upper Mustang in October can have 50 or more trekking groups on the trail simultaneously. In July, you may go entire days without passing another foreign trekker. Teahouses have rooms available at short notice. Monastery caretakers have time for unhurried conversations. The experience of genuinely remote Himalayan travel is substantially easier to access when you're not competing for it with the autumn crowd.
Vivid landscapes. The rain shadow doesn't mean no green. Even in dry Mustang, the lower valleys and side drainages show more wildflower colour in June and July than at any other time of year. The combination of blooming cactus and wild roses against red canyon walls in July Mustang is visually striking in a way the October version of the same landscape isn't.
Cultural events. Several of the most significant festivals in the high plateau regions fall within or immediately before the monsoon season. The Tiji Festival in Lo Manthang takes place in May or early June. Yartung horse festival in Mustang falls in August. Planning a monsoon trek around these events gives access to cultural experiences unavailable at any other time of year. See our Upper Mustang Tiji Festival Trek for a package built around the Lo Manthang festival calendar.
Lower costs. Restricted area permits are fixed costs regardless of season, but teahouse rates, guide day rates, and some flight fares are lower in monsoon months than in October or March peak season. For trekkers on a budget, monsoon offers the same route at meaningfully lower overall cost.
What you accept in return: On the rain-shadow routes, you accept occasional afternoon cloud and the possibility of a brief shower even in the driest areas. You accept that the approach and exit legs of some routes pass through lower-altitude terrain that receives normal monsoon rainfall. You accept that mountain views, while often clear, are not guaranteed on every morning. In Upper Mustang and Dolpo these trade-offs are minor. In Nar Phu and Tsum Valley they require a pragmatic attitude toward weather variability.
Packing for a rain-shadow monsoon trek is closer to packing for a standard Himalayan trek than it is to preparing for trekking in monsoon conditions on the Annapurna Circuit. The core principles are the same, with a few monsoon-specific additions.
Waterproof layers are non-negotiable, even in the driest rain-shadow areas. A Gore-Tex or equivalent hardshell jacket and waterproof pack cover should be at the top of the kit list. In Upper Mustang and Dolpo these may spend most of the trip in your bag, but the days you need them — a brief July cloudburst on the plateau, a wet afternoon arrival at a teahouse — you need them properly.
Sun protection is more critical than rain protection on rain-shadow treks. High-altitude UV is intense, reflected sunlight off pale canyon walls intensifies it further, and the clear skies that make Mustang and Dolpo so walkable in monsoon also mean full-day UV exposure. SPF 50+ sunscreen, UV-blocking sunglasses, and a broad-brim hat are essential.
Warm layers for altitude. Upper Mustang at 4,000 metres, Dolpo at 5,000 metres, and Nar Phu above 5,000 metres all experience cold nights regardless of season. Nights can drop below freezing at altitude even in July and August. A down jacket, thermal base layers, and a sleeping bag rated to at least -5°C are standard requirements.
Gaiters and trekking poles are valuable on sections of trail that cross stream crossings swollen by seasonal melt and any residual monsoon rainfall above the rain shadow line. Even in dry Upper Mustang, water crossings can be fuller in July than in October.
Cash. ATMs do not exist in Mustang, Dolpo, Nar Phu, Tsum Valley, or upper Khumbu above Namche Bazaar. Carry sufficient Nepalese Rupees for the full duration of the trek before leaving the last road town, plus a contingency amount for unexpected delays or extended stays.
June is the ideal entry point for monsoon trekking on all five routes. The monsoon has typically established itself by mid-June, which means the rain-shadow effect is fully active and the popular trails genuinely wet, but the temperature at altitude is still moderate and the days long. The Tiji Festival in Lo Manthang falls in late May to early June, making this the month of highest cultural value for Upper Mustang. Wildflowers in the Mustang side valleys and Dolpo are at their most vivid. Some high passes in Dolpo and Nar Phu still retain snowpack from winter in early June, so late June is safer for the higher-altitude options.
July is the driest month in the rain-shadow regions and the peak of the monsoon on the standard trekking routes. Upper Mustang in July offers the most reliable blue-sky statistics. Dolpo's high plateau is at its most accessible. This is the strongest month for the purely rain-shadow argument, though it is also the hottest month at lower altitudes, which affects the approach legs to some routes.
August continues the pattern with very similar conditions to July on the high routes. Upper Khumbu above 4,500 metres is at its most viable for altitude-above-cloud walking in August. The Yartung horse festival in Mustang takes place in August, creating another significant cultural calendar event. Afternoon cloud build-up can be slightly more pronounced in August than July in some years.
September is the transition month. The monsoon breaks progressively from the northwest during September, with Mustang and Dolpo clearing even further by mid-September while the south-facing routes are still wet until late in the month. Early September remains a monsoon-season option for all five routes. By late September, conditions on the standard routes improve rapidly, and October marks the return of peak-season trekking across Nepal. September is arguably the sweet spot for combining rain-shadow monsoon trekking with the very beginning of autumn-season clarity.
Can you trek in Nepal during the monsoon?
Yes, on specific routes. The rain-shadow trails north of the main Himalayan barrier — Upper Mustang, Dolpo, Nar Phu Valley, Tsum Valley, and upper Khumbu above 4,500 metres — receive little to no monsoon rainfall and stay walkable June through September. Standard routes including Annapurna Circuit, Langtang, and lower Khumbu receive heavy monsoon rainfall and are generally best avoided June to August.
What is the rain shadow in Nepal trekking?
The rain shadow is produced when the main Himalayan range blocks the monsoon winds arriving from the Bay of Bengal. Moisture-laden air is forced upward on the southern face, drops its rainfall, and crosses the ridge depleted. The high plateau regions north of the range receive only 10 to 20 percent of the rainfall that falls on the southern slopes, making them walkable year-round including during the June to September monsoon season.
When is monsoon season in Nepal?
Nepal's monsoon typically runs from mid-June to mid-September, with July and August the heaviest months on south-facing routes. Rain-shadow treks are viable from early June through late September. The autumn trekking season begins in October when the monsoon breaks and clear skies return across all regions.
Do you need a special permit for Upper Mustang in monsoon?
Yes. Upper Mustang's restricted area permit costs USD 500 per person for the first 10 days plus USD 50 per additional day, and is required year-round regardless of season. Dolpo and Nar Phu also require restricted area permits. Tsum Valley requires a Tsum Valley special permit. All must be arranged through a registered Nepalese trekking agency such as Getaway Nepal Adventure.
What are the advantages of trekking Nepal in monsoon season?
On rain-shadow routes: dramatically fewer trekkers, more authentic teahouse and village interaction, lower overall costs, vivid wildflower landscapes, and access to cultural festivals including the Tiji Festival in Mustang and Yartung horse festival in August. The combination of a genuinely remote experience at lower cost and with more cultural access is compelling for trekkers who have already done the standard routes in peak season.
The advice to avoid Nepal in monsoon season made sense when the trekking infrastructure was limited to the Annapurna and Everest standard routes and information about rain-shadow alternatives wasn't widely circulated. It makes less sense now. Upper Mustang has reliable teahouse accommodation, an established trail network, and a rain-shadow guarantee that most October trekking destinations can't match for weather consistency. Dolpo offers wilderness at a scale that simply doesn't exist anywhere on the standard monsoon-alternative circuits of Southeast Asia. Nar Phu and Tsum Valley provide cultural immersion in still-intact Tibetan communities that is harder to access in October when visitor numbers are higher.
The permits, the remoteness, and the need for an experienced local operator are real — these aren't routes where showing up independently at the trailhead with a downloaded map is an option. But that's precisely what keeps them genuinely undiscovered, and what makes the experience so different from anything the standard trekking seasons in Nepal produce.
Getaway Nepal Adventure runs monsoon season departures to all five of these routes every year. Our guides know which passes to cross on which days of the week to maximise clear-sky probability, which teahouses in Mustang have the most reliable kitchens, and where in Tsum Valley the morning light hits the monastery walls just right. Tell us your available travel dates below and we'll put together a monsoon trekking itinerary that makes the most of Nepal's best-kept seasonal secret.
Tell us your travel dates, trekking experience level, group size, and which route interests you most. We respond within 24 hours with availability, permit costs, and a suggested itinerary.
Getaway Nepal Adventure (P.) Ltd.
Thamel Kathmandu, Nepal
Tel: +977 98510 38 908
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