Upper Mustang has a cold, arid trans-Himalayan desert climate, and it is mostly dry even during the monsoon season of Nepal. That single fact changes everything about how you plan your trip. Most trekkers spend months researching a route, book flights, apply for a restricted area permit (which costs USD 500 for the first 10 days), and then arrive in the wrong season.
In spring, afternoon winds hit them, in winter, it becomes extremely cold, and during the monsoon, they expect rain but find dry and dusty conditions instead. None of these situations is very serious in Upper Mustang, the way they would be elsewhere in Nepal, but getting the timing wrong still means wasted days, bad visibility, and uncomfortable nights.
This guide breaks down exactly what the weather looks like across every season so you can plan with precision.
Table of Contents
Why Upper Mustang Weather is Different
Upper Mustang is situated in the rain shadow of the Annapurna and Dhaulagiri mountain ranges, which block the moisture-laden monsoon winds blowing up from the Bay of Bengal. The result is an average annual rainfall of just 252 mm to 307 mm, compared to over 3,000 mm in parts of southern Nepal. Even during peak monsoon, precipitation here is minimal.
The average annual temperature of the region is approximately 10.9°C, and the climate is classified as a cold desert. Elevation has a big impact here; the higher you go, the colder it gets after sunset, regardless of how warm the afternoon feels.
One feature that surprises first-time trekkers is the wind. Afternoon winds are common in Upper Mustang for most of the year between February and May. By midday, gusts can make walking on open ridges difficult.
How is Upper Mustang Weather Throughout the Year?
Use this table to match your travel time with the actual weather conditions in the area.
Month
Average High
Average Low
Conditions
January
11°C
-7°C
Cold, dry, snowfall (sometimes)
February
13°C
-5°C
Cold, dry, windy
March
16°C
-2°C
Cool days, cold nights, wind picks up
April
15°C
0°C
Mild days, cool nights, some winds
May
18°C
4°C
Warm, dry, great trekking conditions
June
20°C
8°C
Warm, dry, potential afternoon winds
July
22°C
11°C
Warm, occasional cloud cover
August
22°C
11°C
Warm, light rains possible
September
20°C
7°C
Mild, clear skies, ideal trekking
October
17°C
3°C
Cool air, excellent visibility
November
12°C
-3°C
Cold, dry, cloudless skies
December
8°C
-10°C
Cold, dry, intermittent snow
Spring Weather in Upper Mustang
Spring (March to May) is considered one of the best seasons for trekking in Upper Mustang. Daytime temperatures average between 15°C and 21°C, the skies are clear, and the trails are dry.
The one consistent challenge in spring is wind. Afternoons, particularly between 1 PM and 4 PM, can bring powerful gusts across the plateau sections between villages. Experienced trekkers plan for early morning starts to cover ground before conditions deteriorate.
May also coincides with the Tiji Festival, a three-day religious ceremony held in Lo Manthang that attracts visitors from Nepal and the diaspora. If the festival falls during your travel window, weather and cultural experience align perfectly.
Summer Weather and the Rain Shadow Effect
Summer (June to August) is when Upper Mustang becomes very different from the rest of Nepal. While the trekking industry largely shuts down due to monsoon flooding, trail washouts, and leeches, Upper Mustang stays dry.
Daytime temperatures during summer peak at 22°C to 25°C, and nights are comfortable at 8°C to 11°C. The Annapurna and Dhaulagiri mountains block the monsoon clouds before they reach the area, keeping the valley dry.
However, there is one important thing to keep in mind. The lower section of the route through Jomsom and Kagbeni does receive some rainfall during this period. Road access and river crossings closer to Beni can be affected, but once you are inside Upper Mustang proper, conditions normalize quickly.
Autumn Weather in Upper Mustang
Autumn (September to November), like spring, is one of the best times to visit Upper Mustang when the weather is most favorable. September clears quickly after the tail end of the monsoon. Skies are completely blue, visibility extends for hundreds of kilometers, and temperatures are moderate: 12°C to 20°C during the day, dropping to -3°C to -8°C at night. October is considered the best month for trekking, with clear air, consistent weather, and little to no wind.
November is the start of a transition. Days are still clear and manageable, but nights begin to drop below -5°C regularly, and by late November, high passes start accumulating snow. Trekkers who push deep into November need to carry warmer gear and check trail conditions carefully.
Winter Weather in Upper Mustang
Winter (December to February) is very cold. Daytime temperatures in Lo Manthang stay around 0°C to 5°C, but at night they drop to -20°C to -25°C. The coldest month is January, when lows can reach -7.3°C even on the valley floor.
Snowfall is possible throughout winter, and some high passes on trekking routes into Lo Manthang can become inaccessible after heavy snowfall. That said, compared to most Himalayan regions, winter precipitation in Upper Mustang is low. The trails are not washed out or overgrown; the only challenge is the cold temperature.
For experienced, well-equipped trekkers, winter offers absolute solitude. Teahouses are mostly empty, and the cave monasteries and old villages look even more unique when covered with frost. In winter, there are about 9 hours of sunshine each day, so the cold is a dry cold that the sun can partially offset.
What to Pack for Each Season
Your packing list should match the season, not just a generic “Himalayan trekking” checklist.
Spring and Autumn
Summer
Winter
Moisture-absorbing base layers and mid-layer fleece
Lighter layers with a windproof shell
Down jacket rated to -20°C
A windproof outer shell (critical for spring afternoons)
Rain jacket for the lower elevation approach through Jomsom
Thermal base layers (top and bottom)
Insulated sleeping bag rated to at least -10°C
Dust protection (a buff or face mask) for dry, windy days on the plateau
Insulated gloves and a balaclava
Sun protection: UV index at altitude is extreme, sunscreen SPF 50+ and UV-blocking sunglasses are non-negotiable
Microspikes or crampons if venturing to higher passes
Trekking poles for rocky descents
Hand warmers as backup
Weather Myths about Upper Mustang
Even though Upper Mustang is known as a “rain shadow” desert, several common misconceptions can lead to poor planning for trekkers. Here are some myths about Upper Mustang.
The Myth
The Reality (Buster)
It Never Rains
While in a rain shadow, it still gets occasional rain.
Summer is Perfectly Dry
The trek is dry, but the access route (Pokhara to Jomsom) is mostly hit by heavy monsoon landslides
The Wind is a Breeze
It is a daily gale. After 12:00 PM, 40 km/h winds blow dust and sand
Winter is Just Quiet
It becomes very quiet. Most teahouses close as locals move south to avoid the extreme cold
Sun is the Same as Home
The air is thin, so UV rays are stronger. You can get sunburned much faster than at sea level
How Strong are the Winds and Dust Storms in Upper Mustang
Winds in Upper Mustang are one of the strongest natural forces. Calm conditions last only until late morning. After about 11 AM, wind speeds rise quickly as air moves up from the Kali Gandaki Gorge toward the Tibetan Plateau. Average afternoon winds reach 40 to 50 km/h, which is strong enough to slow walking speed and make communication difficult. In extreme cases, weather stations near Jomsom have recorded gusts close to 150 km/h, though such events are rare.
These strong winds lift loose sand and dust from the dry valley floor, creating short but intense dust storms. Visibility can drop quickly on open trails, and trekkers may struggle to see paths clearly. The wind also increases physical effort, as walking against it feels much harder than normal hiking. Dust can irritate the eyes and throat, so protection like sunglasses and a face covering is essential during the afternoon hours.
Does Upper Mustang Ever Get Snow?
Yes, but not as frequently as the other Himalayan regions. Snowfall occurs mainly between December and February, with late-season snow in March at higher elevations. The trans-Himalayan location means precipitation of any kind is relatively rare. When snow does fall, it clears within a day or two due to low humidity and sunshine.
The highest recorded temperature in Upper Mustang is around 35°C, documented in April and June. The temperature range across a single year in Upper Mustang is therefore extreme, from -25°C at high-altitude winter campsites to 35°C on a hot June afternoon in the valley.
Plan Your Trip Around the Weather
The data points to two clear seasons, late March through May and late September through October. Summer is an option if you want fewer crowds and don’t mind some wind and dust. Winter is viable only for experienced, properly planned trekkers.
Upper Mustang requires a Restricted Area Permit, organized through a licensed trekking agency. This is not a region where you show up and figure it out. Permits, logistics, and guide requirements make advance planning essential regardless of season. Himalayan 360 offers permitted treks in Upper Mustang, with seasonal itineraries planned according to the best weather periods outlined in this guide.
Starting in Nepal, there is a rare journey to the Upper Mustang Trek, leading to the last Forbidden Kingdom called Lo Manthang. Beyond the tall Himalayas and the reach of the monsoon, there lies a dry, desert-like land unlike much of Nepal. The trail was closed to outsiders until 1992, this area hold its old Tibetan culture and mysterious feeling. Along the way, there are ancient caravan trails, fortress villages, and monasteries built on cliffs, making it seem like a place frozen in time.
As you travel through desert-like trails, you’ll pass through age-old villages like Kagbeni, traditional Mustangi homes, and mysterious cave monasteries. The journey winds past terraced fields, hidden valleys, and the banks of the Trishuli and Marsyangdi Rivers. Along the way, take in stunning views of Annapurna, Dhaulagiri, and Manaslu. The stark landscapes are dotted with fossil rocks and sacred chortens. Lo Manthang, a walled city rich in legend and tradition, is at the heart of the trek. This is more than a trek, it’s a walk through living history.
Experience the exhilarating and awe-inspiring Upper Mustang Motorbike Tour, curated exclusively by Himalayan 360. Ignite your senses as you embark on a journey like no other, astride the powerful 500cc Classic Enfield or the rugged 411 CC Royal Enfield Himalayan bike. Brace yourself for an adventure that will leave an indelible mark on your soul as you traverse the mesmerizing landscapes of the majestic Tibetan Plateau.
The Upper Mustang Overland Jeep Tour is a quick and accessible exploration of the Upper Mustang region without the effort of long trekking days. Upper Mustang is known as the “Last Forbidden Kingdom of Nepal”. It was closed to outsiders until the early 1992. Since then, it slowly opened up and has now become a renowned travel destination due to easy roadway access.
Many people visit there to experience its ancient culture, dramatic landscapes, and quiet charm, which remains untouched by modern life. The region feels like a different world, with dry, desert-like hills, red cliffs, and villages that reflect a strong Tibetan Buddhist culture.
The 11 days Upper Mustang Overland tour package via jeep takes you deep into Nepal’s remote north, right up to the border of Tibet. Your journey starts in Kathmandu and takes you through famous places like Pokhara, Tatopani, Jomsom, Kagbeni, and Marpha before reaching the ancient walled city of Lo Manthang.
Along the way, you’ll explore monasteries, chortens, and prayer walls that share stories of the region’s spiritual heritage. You’ll also drive beside the Kali Gandaki River, known for its black fossils (shaligrams), and enjoy views of towering peaks like Nilgiri and Dhaulagiri. Other highlights include visits to mysterious sky caves, rare Himalayan landscapes, and colorful local villages where people still live by ancient customs. The region is rich in history, and the quiet beauty of Mustang makes it one of Nepal’s most unique and unforgettable destinations.
Mr. Raj’s main goal is to provide great services that give good value for money to his clients. He wants to create travel experiences that suit different preferences and ages, whether people are looking for moderate adventures or thrill-seeking activities. He knows that travel is not just about seeing new places but about making unforgettable memories.
In addition to helping travelers, Mr. Raj is committed to giving back to the community. He makes sure that part of his company’s profits goes to support struggling rural farming villages. This support goes beyond just money; he also works to improve the lives of people in these communities.
Mr. Raj is especially passionate about education. He believes that education can help break the cycle of poverty, so he invests in the needs of underprivileged children. This includes providing school supplies and supporting health and hygiene initiatives in schools. By doing this, Mr. Raj aims to empower current and future generations, helping to create a better and more sustainable future for everyone.
Share:
Tailor-Made Adventures Await
Wherever you want to go,
we’ll make it extraordinary and uniquely yours.
Create a travel experience that reflects your style and preferences.
With expert guidance, every moment of your trip is uniquely tailored to you.
This site uses cookies to optimize your user experience. By using this site, you are consenting to our use of these cookies. Check out our Privacy Policy.
Chat with Amrit on WhatsApp
Need help? Chat with our travel expert Mr. Amrit Nepal—just fill out the form below to get started!
