Kathmandu sits in a broad valley at the foot of the Himalayas, a city where ancient temples share narrow lanes with incense smoke and the aroma of steaming momos. Seven UNESCO World Heritage Sites cluster within the valley, from the gilded eyes of Boudhanath Stupa to the centuries-old Newari woodwork of Patan Durbar Square. It's the staging ground for Himalayan treks, yes, but Kathmandu rewards those who linger: morning walks through the spice-filled corridors of Asan Bazaar, plates of Samaya Baji loaded with beaten rice and smoky buffalo meat, and a festival calendar so packed that celebrations seem to spill into the streets every other week.
The best time to visit Kathmandu is early October through early December, when skies are clear, temperatures feel comfortable, and the valley's biggest festivals unfold. Dashain, Nepal's grandest celebration honoring the goddess Durga, fills the city with family gatherings, towering bamboo swings, and ceremonial blessings throughout October. Tihar follows in late October or November, lighting homes with oil lamps and colorful mandalas. Highs sit in the upper 70s°F and rain is virtually nonexistent. A strong secondary window runs from late February through late May, except for a stretch in early May when conditions can dip. Spring brings dry weather, the Holi festival of colors, and fewer crowds, though air quality deteriorates through March and April. Budget travelers will find the best accommodation deals in spring, when tourism hits its lowest point.
Spring in Kathmandu, Nepal
Spring is when Kathmandu slows down from the winter tourist rush, making it the quietest season for visitors. That translates to shorter lines at temple complexes and better rates on guesthouses. In March, the Holi festival transforms Thamel, Basantapur Durbar Square, and Patan into a riotous celebration where revelers pelt each other with colored powder and water balloons. The energy is contagious, though you'll want to wear clothes you don't mind losing. Around mid-April, the Nepali New Year kicks off with Bisket Jatra in nearby Bhaktapur, where hundreds of people haul massive wooden chariots through medieval alleys while Dhimay drums thunder through the streets.
Afternoon highs climb to 81.5°F (27.5°C), warm enough for comfortable sightseeing in a t-shirt, while mornings start cooler at 55.6°F (13.1°C), perfect for early walks through Asan Bazaar or the climb up Swayambhunath's 365 steps before the midday warmth sets in. Showers are rare, with precipitation appearing only zero to two days through the season. The one serious downside is air quality: January through April ranks among Kathmandu's worst months for haze, pushing conditions into the Unhealthy for Sensitive Groups range. Mountain views disappear behind a milky veil, and travelers with respiratory sensitivities should carry a face mask for extended walks around the Durbar Squares.
Humidity drops to its annual low in April, keeping things comfortable even as temperatures build toward summer. Pack sunscreen and a light layer for temple visits where shoulders and knees should be covered, plus sunglasses for the glare off whitewashed stupas.
Summer in Kathmandu, Nepal
The monsoon arrives in June and doesn't let go until September. This is when Kathmandu gets the vast majority of its annual rainfall, with August topping out as the wettest month at a 53% daily chance of significant rain. July isn't far behind at 52%. Heavy afternoon downpours turn the valley's rivers muddy and can trigger landslides on mountain roads, making this the worst season for trekking logistics. Flights to mountain airstrips like Lukla get canceled frequently due to cloud cover.
Seasonal highs average 84.5°F (29.2°C) with lows around 68.6°F (20.3°C), and humidity pushes into the mid-70s percent, making the air feel heavy. Early June brings the peak heat of the year, with highs of 86.8°F (30.4°C) and overnight lows of 67.1°F (19.5°C) before the monsoon clouds provide some relief. The upside is that the valley turns extraordinarily green: rice paddies surrounding the city glow emerald, and the gardens around Pashupatinath Temple look lush. Tourism dips, so accommodation rates drop, and you'll have temples largely to yourself.
If you're in Kathmandu during the monsoon, lean into indoor experiences: take a Newari cooking class where you learn to fold momos and simmer dal bhat, explore the Patan Museum's collection of bronze and stone work, or warm up with a bowl of thukpa noodle soup at a Tibetan restaurant in Boudha. Pack a compact rain jacket and waterproof bag for your electronics, because afternoon storms roll through without much warning.
Fall in Kathmandu, Nepal
October and November are when Kathmandu puts on its best show. The monsoon rains have scrubbed the air clean, and on clear mornings you can see the snow-capped Himalayan peaks from rooftop cafes near Boudhanath Stupa. This is also prime trekking season: the trails to Everest Base Camp, the Annapurna Circuit, and the Langtang Valley are all at peak accessibility. Dashain, Nepal's most important festival, typically falls in October. The celebration stretches over fifteen days, during which families gather, children play on towering bamboo swings, and elders place tika blessings of rice, vermillion, and yogurt on foreheads. Shortly after, Tihar (Nepal's version of Diwali) lights up the city with oil lamps, flower garlands, and the tradition of Mha Puja, the Newar self-worship ceremony.
Highs average a comfortable 78.8°F (26°C), ideal for full days of exploring the valley's heritage sites without overheating. Lows dip to 57.5°F (14.2°C), so evenings carry a pleasant coolness, perfect for lingering over a Newari khaja set at an outdoor eatery. Rain drops to almost nothing: November records a 0% chance of significant precipitation, and October sits at just 9%. The Indra Jatra street festival, with its masked dances and the chariot procession of Kathmandu's living goddess Kumari, typically falls in September, catching the very start of the season.
This is the second-busiest tourism period, so book accommodation and trekking permits well ahead. Long summer evenings have shortened, but you still get solid daylight with roughly 11.5 hours in October and 10.8 in November. Bring layers for the cooling nights and a good camera for the mountain panoramas that only this season delivers.
Winter in Kathmandu, Nepal
Winter in Kathmandu is a tale of two halves. December still carries some of fall's clarity, and the Kathmandu International Mountain Film Festival typically screens in early December, bringing mountain culture enthusiasts together for films, lectures, and workshops. The Newari community celebrates Yomari Purnima around the November-December full moon, when families gather to make yomari, sweet rice-flour dumplings filled with molasses and sesame seeds. Tourism peaks during the December holiday period, so expect more competition for guesthouses around Thamel.
Highs average 68°F (20°C), pleasant enough for daytime sightseeing in a light jacket, but mornings and evenings drop to 40.2°F (4.6°C). You'll feel that chill sharply in older guesthouses that lack central heating; pack warm base layers and a fleece. Rain is almost nonexistent, with December at just 1% and January at 2%. By January, however, air quality becomes a real concern. Haze from cooking fires, brick kilns, and vehicle emissions settles over the valley, pushing air quality into Unhealthy for Sensitive Groups territory through February. Mountain views that were stunning in October become obscured by a gray-brown haze.
Shorter days, around 10.4 hours of daylight in December, mean you'll want to start temple visits early. The compensating factor is that Kathmandu's cultural sites feel more intimate with fewer visitors. A steaming cup of butter tea at a Boudha rooftop cafe while watching pilgrims circumambulate the stupa is a quiet, memorable way to spend a winter afternoon.
At a Glance
Monthly weather, visitor crowds, air quality, holidays, and daylight hours to help you plan your trip.
Travel Tips & Safety for Kathmandu, Nepal
Kathmandu's traffic is dense and unpredictable; walking is often faster than driving for short distances, but always stay alert at intersections where vehicles, bikes, and pedestrians mix freely. For day trips to Patan, Bhaktapur, or Nagarkot, local minibuses run frequently from Ratnapark, though taxis and ride-hailing apps offer more comfort. Trekking permits for routes like the Annapurna or Everest regions can be arranged through agencies in Thamel, but allow an extra day for processing during busy fall months.
Stick to bottled or filtered water and be cautious with raw vegetables and street food from vendors with questionable hygiene practices. Altitude is not a concern in the Kathmandu Valley itself, which sits at roughly 4,600 feet, but anyone heading to higher elevations should acclimatize properly and carry altitude sickness medication. Watch for pickpockets in crowded areas like Durbar Square and Asan Bazaar, and always ask permission before photographing religious ceremonies or sadhus, as a donation is often expected.