Kathmandu weather in September
“Mild and bright — an underrated time to visit.”
Roughly 29 rainy days across the month, on average.
September in Kathmandu is warm and wet, marking the tail end of the monsoon season. Expect daytime temperatures around 25.8°C (78°F) and cooler nights at 18.7°C (66°F). Rainfall is substantial with 432mm falling across roughly 28 days, so mornings and afternoons often bring heavy showers. Despite the rain, you'll still get around 8.7 hours of sunshine daily, usually in the early morning or late afternoon. The air is thick with humidity, and the valley's iconic views of the Himalayas remain obscured by monsoon clouds.
Culturally, September is a quieter time in Kathmandu. The monsoon keeps most tourists away, meaning lower prices and fewer crowds at temples like Pashupatinath and Boudhanath. The city feels fresher after the intense summer heat, and locals are preparing for Dashain, Nepal's biggest festival, which typically falls in October. The lush green landscape is at its most vibrant thanks to months of rainfall.
If you're considering visiting Kathmandu in September 2026, pack for wet weather and embrace the slower pace. Trekking is challenging due to rain and slippery trails, but city exploration, museum visits, and cultural experiences are rewarding. Book accommodation in advance despite lower tourism—many places still fill up during this shoulder season.
Thamel is backpacker theater; real Kathmandu eats at Bhojan Griha in Dilli Bazaar or Nepali dal-bhat thali at Thakali Bhanchha Ghar. Bhaktapur charges 1800 rupees entry but locals slip through side alleys pre-8am. Newari culture is distinct from Nepali; try yomari sweet in December. Pashupatinath cremations happen publicly, respect trumps photos. Load-shedding ended 2018 but power cuts still hit January cold snaps.
What to pack for Kathmandu in September
September demands rain-ready clothing alongside warm layers for variable temperatures. Mornings are cooler, afternoons warm and humid, and showers arrive suddenly. Waterproof gear is essential, as are breathable fabrics to manage moisture and sweat.
- Lightweight rain jacket or waterproof poncho
- Quick-dry linen or cotton shirts
- Water-resistant hiking pants or joggers
- Waterproof hiking boots or trail shoes
- Compact umbrella or rain hat
What to pack for Kathmandu in September
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Where to stay in Kathmandu
We don't review individual hotels — plenty of people do that well. What we do is send you to compare rooms in Kathmandu across trusted platforms.
Compare hotels on Booking.com→Estimated September trip to Kathmandu
Shoulder-season pricing — a balance of price and conditions. Rule-based estimates from a couple based in London — actual prices vary.
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Delayed flight to Kathmandu?
September sees 432mm of rain here — delays happen. Check if you're eligible for compensation. EU regulations cover flights departing from or arriving in the EU/UK.
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Things worth doing
Explore Pashupatinath Temple and Boudhanath Stupa, visit Kathmandu Durbar Square, trek to Nagarkot viewpoint early mornings, enjoy museum visits and indoor cultural experiences.
September vs. the rest of the year
How this month compares in Kathmandu. Tap any month to read more.
highlighted months are among the best time to visit.
Best time to visit Kathmandu
While September has its own character in Kathmandu, the data-backed best months to visit Kathmandu are February, March, April, November. These months combine the most favourable temperatures, rainfall, and sunshine across an 11-year climate record (2015–2025).
See the full best-time-to-visit guide for KathmanduOther places with a similar climate right now
Kathmandu in September — FAQ
Q01Is September a good time to visit Kathmandu?
Is September a good time to visit Kathmandu?
It is a challenging month — you may want to consider another time of year. In September, Kathmandu averages a high of 26°C (78°F) and a low of 19°C (66°F), with 432mm of rainfall across roughly 29 rainy days. October-November post-monsoon clears Himalayan haze for Nagarkot sunrise; Dashain and Tihar festivals fill October streets with marigolds and clay lamps.
Q02What is the average temperature in Kathmandu in September?
What is the average temperature in Kathmandu in September?
The average high temperature in Kathmandu during September is 26°C (78°F), with an average low of 19°C (66°F). These figures are averaged from 11 complete years of daily records (2015–2025, Open-Meteo Archive).
Q03How many rainy days does Kathmandu have in September?
How many rainy days does Kathmandu have in September?
Kathmandu averages approximately 29 rainy days in September, with a total monthly rainfall of about 432mm. This is based on daily precipitation records where days with 1mm or more of rain are counted as rainy days. June-September monsoon dumps 1500mm; leeches infest Shivapuri hikes, Bagmati floods Pashupatinath ghats, trekking basically ends.
Q04What should I pack for Kathmandu in September?
What should I pack for Kathmandu in September?
For Kathmandu in September, pack layered clothing for changing temperatures, a compact umbrella or waterproof jacket, sunscreen and sunglasses, comfortable walking shoes. These recommendations are based on 11 complete years of weather averages for this specific month. N95 masks for winter inversion when Kathmandu valley AQI regularly exceeds 300, worse than Beijing.
Q05How crowded is Kathmandu in September?
How crowded is Kathmandu in September?
Tourist crowds in Kathmandu during September are typically moderate — shoulder season, a sweet spot between crowds and weather. Consider this when planning accommodation — prices track crowd levels closely. Thamel is backpacker theater; real Kathmandu eats at Bhojan Griha in Dilli Bazaar or Nepali dal-bhat thali at Thakali Bhanchha Ghar. Bhaktapur charges 1800 rupees entry but locals slip through side alleys pre-8am. Newari culture is distinct from Nepali; try yomari sweet in December. Pashupatinath cremations happen publicly, respect trumps photos. Load-shedding ended 2018 but power cuts still hit January cold snaps.