Quick Facts about Nepal Climate
- Best overall months: October, November, March and April
- Kathmandu daytime range: roughly 10°C in January to 30°C in June
- Coldest trekking point: Everest Base Camp region, down to -20°C at night in winter
- Wettest months: July and August, with rain on 17 to 20 days each month
- Driest month: November, often just a single rainy day
If you are trying to work out when to book flights to Nepal, the honest answer is that the date on the calendar matters less than where you are standing. A Kathmandu afternoon in December can feel like a mild English autumn, while a night at Everest Base Camp that same week can drop to minus 20°C. This nepal climate guide walks through what actually happens to the weather in Nepal year-round, month by month and region by region, so you can plan around it instead of guessing.
“People email us asking for ‘the weather in Nepal’ as if it’s one number,” says Saurab, AskMeNepal’s travel expert who has been building trekking and tour itineraries around Nepal’s seasons for over a decade. “I always tell them to think in layers, altitude, season and region, because Pokhara at 800 metres and Thorong La pass at 5,416 metres have completely different days even when the calendar says the same date.”
Why Nepal’s Weather Changes So Much Over Short Distances
Nepal packs an extraordinary elevation range into a narrow country, from around 60 metres above sea level in the Terai lowlands near the Indian border to 8,849 metres at the summit of Everest. As a rough rule, temperature drops by about 6°C for every 1,000 metres of ascent, which is why a warm morning in Kathmandu can turn into a genuinely cold evening a few hours up the trail.
Geographers usually split the country into three broad climate zones. The Terai in the south is subtropical, with summer highs regularly passing 40°C and even reaching 45°C in the far west. The mid-hills, home to Kathmandu (1,400m) and Pokhara (820m), sit in a temperate zone where the climate stays comparatively mild all year, with an average annual temperature between 8°C and 25°C. Above roughly 3,000 metres, the Himalayan zone takes over, and this is where trekkers heading to Everest Base Camp, Annapurna Base Camp or the Manaslu circuit start to feel proper mountain cold, even in the supposedly warm months.
This three-zone structure is worth understanding before you look at a single month-by-month chart, because a forecast for “Nepal” that does not specify a zone is not really telling you much.
The Terai Plains
The Terai stretches along Nepal’s southern border and includes Chitwan National Park and Bardia, the country’s best wildlife-watching destinations. Summers here are genuinely hot and humid, with temperatures that can feel oppressive by midday. Winter is the far more comfortable season, with daytime highs of 20°C to 25°C and cool mornings that bring animals down to riverbanks, which is exactly when Chitwan safari sightings tend to improve.
The Mid-Hills and Valleys
Kathmandu Valley, Pokhara and towns like Bandipur sit in this temperate band. Days rarely swing to extremes, and this is the zone most first-time visitors experience for the bulk of their trip, whether they are exploring Durbar Square or planning a day trip out to Kathmandu’s heritage sites.
The Himalayan Zone
Above the tree line, weather turns serious. Even in peak trekking season, mornings on high passes start below freezing, and anyone heading into this zone for routes like Annapurna trekking routes or the Mustang region needs proper down layers regardless of what the lowland forecast says.
Nepal’s Five Traditional Seasons
Most Western guidebooks describe Nepal in four seasons, but the traditional Nepali agricultural calendar actually recognises five: Basanta (spring), Grishma (early summer), Barsha (monsoon), Sharad (autumn) and Hemanta and Shishir together (late autumn into winter). For travel planning purposes, the practical version most guides use collapses neatly into four windows that matter for trip timing. So when does monsoon season actually start in Nepal? Generally the rains arrive in mid-June and taper off by mid-September, a detail that shapes almost every itinerary decision that follows.
Spring in Nepal: March to May
Spring is the country’s headline trekking season, and for good reason. As temperatures climb steadily through March, the lower and mid-hills warm to a comfortable 20°C to 25°C during the day, while nights stay cool, hovering around 10°C. Trails that were snow-bound in January reopen, and by late March the hillsides around Ghorepani and Poon Hill turn pink and red as rhododendron forests come into bloom.
By April, skies are largely clear and daytime highs in the hills can reach 28°C to 30°C, though early morning starts on high routes still call for a warm layer. May marks the transition toward monsoon, with rising humidity, particularly in the lowlands, and the odd unpredictable afternoon shower. Trekking is still very much on in May, but afternoons get muggier the closer you get to June.
This window suits Everest Base Camp, the Annapurna Circuit, Langtang Valley and Upper Mustang equally well, and it is also peak season, so teahouses along popular routes fill up fast. Booking permits and accommodation two to three months ahead is worth doing if you are set on specific dates.
Monsoon in Nepal: June to September
Monsoon gets a bad reputation it only partly deserves. Rain does arrive in force, with July typically bringing around 20 rainy days and the heaviest single-month totals of the year, often 300mm or more in the wettest hill districts. Daytime temperatures in Kathmandu and Pokhara sit around 24°C to 30°C, with high humidity that makes the air feel warmer than the thermometer suggests.
The practical downsides are real: leeches on lower trails, occasional landslides on mountain roads, and a meaningfully higher risk of flight cancellations to Lukla and other mountain airstrips. That said, monsoon is when the Himalaya’s rain shadow region comes into its own. Upper Mustang and Dolpo sit north of the main Himalayan range, so they receive a fraction of the rainfall that falls on Pokhara or the Annapurna foothills, which makes them a genuinely good monsoon-season alternative if you still want a trekking trip in July or August.
Monsoon is also low season for hotel and flight prices, and Kathmandu Valley’s sacred sites are quieter and lusher looking than at any other time of year, useful if crowds bother you more than a bit of rain.
Autumn in Nepal: October and November
If you only remember one season from this guide, make it this one. Autumn is consistently rated the best time to visit by both official tourism data and the guides who work these trails every year. The monsoon clears out by early to mid-October, leaving behind washed, dust-free skies, mountain views at their sharpest, and daytime temperatures in the mid-hills that sit comfortably between 20°C and 26°C.
November tends to be the driest month of the entire year, frequently logging no more than a single day of rain across the whole month, according to long-run climate averages. Nights start to cool noticeably, particularly at altitude, but daytime trekking conditions across Everest, Annapurna, Langtang and Mustang are close to ideal. This is also when Nepal’s two biggest festivals, Dashain and Tihar, usually fall, so travellers get excellent weather alongside genuine cultural events rather than staged performances.
Autumn is peak season for a reason, so expect busier trails, higher flight prices to Lukla, and the need to book teahouses and permits well in advance, especially for Everest Base Camp and the Annapurna Circuit.
Winter in Nepal: December to February
Winter divides opinion, and it should not. In the Terai and Kathmandu Valley, winter is mild and highly workable, with daytime temperatures of 12°C to 20°C, clear skies, and some of the year’s best visibility for mountain views from viewpoints like Nagarkot or Sarangkot. It is also the best window for wildlife safaris in Chitwan, when cooler weather pushes animals toward open riverbanks.
Higher up, the picture changes fast. Namche Bazaar, at 3,450 metres on the Everest trail, can drop to -7°C overnight, and Everest Base Camp itself regularly sees -15°C to -20°C after dark in January. High passes such as Thorong La on the Annapurna Circuit frequently close due to snow. That does not rule out winter trekking altogether, and lower routes like Ghorepani-Poon Hill or Mardi Himal generally stay open with the right gear, but anyone planning a high-altitude winter trek needs a serious cold-weather kit and realistic expectations about pass closures.
Winter is also Nepal’s quietest tourist season, which means better hotel rates, empty trails on the routes that do stay open, and a noticeably different, more solitary version of the mountains.
Matching the Season to What You Want to Do
Not every trip needs the same weather window. A few common scenarios:
- High-altitude trekking (Everest, Annapurna, Manaslu): aim for March to May or late September to November, when trails are clear and passes are open.
- Wildlife safari in Chitwan or Bardia: December to February gives the coolest, driest conditions and the best animal sightings near water sources.
- Cultural sightseeing around Kathmandu Valley: workable nearly year-round, though autumn and winter offer the clearest skies for temple and mountain photography.
- Budget travel with fewer crowds: monsoon months bring lower prices and quieter sites, provided you build in flexibility for transport delays.
- Rain-shadow trekking in monsoon season: Upper Mustang and Dolpo stay comparatively dry even in July and August.
According to the Nepal Tourism Board, the country’s climate genuinely supports year-round travel once trips are matched to the right zone and season, rather than treating Nepal as a single climate block the way many first-time visitors do.
What to Pack for Nepal’s Weather
Packing lists shift enormously depending on season and altitude, but a few essentials come up on almost every AskMeNepal trip:
- A warm, packable down layer, even for spring and autumn treks, since evenings at altitude turn cold fast
- A lightweight waterproof shell for monsoon months or unpredictable spring afternoons
- Sturdy, broken-in trekking boots with good ankle support for uneven trail surfaces
- Sun protection, including SPF 50+ and sunglasses rated for high-altitude UV exposure
- A microfibre or quick-dry travel towel, genuinely useful in humid monsoon conditions
- A basic first aid kit with altitude sickness medication if you are heading above 3,000 metres
“The mistake I still see every season,” Saurab notes, “is trekkers packing for the temperature in Kathmandu and forgetting that Namche or Manang will be a completely different climate by the time they get there. Layers, not one heavy jacket, are what actually work.”
A Detail Most Guides Skip: Diurnal Swing
Most climate articles quote a single daytime figure and leave it there. What genuinely matters for comfort on the trail is the diurnal swing, the gap between daytime high and nighttime low, which widens dramatically with altitude. In Kathmandu, that gap might be 10°C to 12°C. At Everest Base Camp in the trekking season, the same day can swing from a pleasant 15°C at noon to well below freezing after sunset, a 30°C or more shift within twelve hours. Packing for the average temperature of a region, rather than for that swing, is one of the most common and avoidable planning mistakes AskMeNepal sees from first-time trekkers.
Common Questions About Nepal’s Weather
Is Nepal cold or hot?
It depends entirely on where you stand. The Terai lowlands run hot and humid for most of the year, the mid-hills stay temperate, and anything above 3,000 metres is genuinely cold, particularly at night. There is no single answer that applies to the whole country.
What is the rainiest month in Nepal?
July, usually followed closely by August. Both months bring rain on roughly 17 to 20 days, concentrated in the mid-hills and Terai rather than the rain-shadow areas north of the main Himalayan range.
Can you trek in Nepal during winter?
Yes, at lower elevations. Routes like Ghorepani-Poon Hill and Mardi Himal generally stay open through December to February, though high passes such as Thorong La often close due to snow, and temperatures at altitude drop well below freezing overnight.
Does it snow in Kathmandu?
Rarely. Kathmandu Valley sits at around 1,400 metres, low enough that snowfall in the city itself is unusual, even in the coldest winter weeks, though frost on winter mornings is common.
Getting Weather-Ready Before You Travel
Once you have settled on a season, the practical planning questions become straightforward. Kathmandu’s Tribhuvan International Airport handles nearly all international arrivals, and domestic flights to trekking hubs like Lukla or Jomsom are far more weather-sensitive than the international side, so building a buffer day or two into any itinerary that depends on a mountain flight is genuinely worth doing. Tourist buses and jeeps connecting Kathmandu, Pokhara and trailheads run year-round but slow down on mountain roads during heavy monsoon rain.
For high-altitude routes, checking permit requirements alongside the season matters too. Routes through Annapurna Conservation Area and Sagarmatha National Park both carry entry permits, and TIMS card requirements apply on most major trekking routes regardless of month.
Nepal’s Climate, in Plain Terms
There is no single “Nepal weather,” and treating the country as one climate zone is where most trip-planning mistakes start. Autumn and spring give the most reliable trekking conditions across the board. Winter rewards patience with clear skies and thin crowds at lower altitude, while ruling out high passes. Monsoon punishes rigid itineraries but rewards travellers willing to shift toward rain-shadow regions like Mustang or simply enjoy a quieter, greener Kathmandu Valley.
Whichever window you choose, match your route, your gear and your expectations to the zone you will actually be standing in, not just the month on the calendar.
Planning a specific trek and want season-by-season advice for that route? Have a look at our Everest region trekking guides for altitude-specific weather notes before you book.
