Katmandu Weather in September
Katmandu in September sees high daytime temperatures of 26°C (79°F) and nighttime lows of 19°C (66°F). As part of the rainy season, showers are frequent and often heavy. Budget around 332 mm (13 in) of rainfall for the month.
Rainfall in Katmandu in September
As part of the rainy season, Katmandu sees around 10 days of rain in September, with an average of 332 mm (13 in). Rain during the rainy season here tends to be intense rather than just persistent drizzle. Expect significant downpours.
Temperature in Katmandu in September
In September, Katmandu gets high temperatures, with highs of 26°C (79°F). Nights cool to around 19°C (66°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. Nights cool down to 19°C (66°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in Katmandu in September
The month brings about 133 hours of sunlight, offering a comfortable mix of sun and rainy moments.
Wind Speed in Katmandu in September
Wind speeds average () during September. This means conditions are typically very calm, with barely any noticeable air movement. While this is an average, some days may bring a light breeze, but many remain entirely still.September in Katmandu has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Nepal, check out our Katmandu's climate page.
Katmandu Temperature in September
Min Temperature
19°C (66°F)
Max Temperature
26°C (79°F)
Chance of Rain
34%
Precipitation
332 mm (13 in)
Rainy days
10 days
Humidity
82%
Windspeed
()
Sunshine
133 hours
Percentage Sunshine
Daily Historical Temperatures
30-year average (1988-2025)
Based on our historical records, temperatures in Katmandu typically stay consistent throughout September, with daily highs averaging around 26°C (79°F). Nights are pleasant, with lows around 19°C (66°F).
Average temperatures in September
Daily Historical Precipitation
30-year average (1988-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Katmandu in September
Browse day-by-day weather records for Katmandu spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Katmandu historical weather extremes in September
Based on 19 years of weather observations (2006-2025), these are the most extreme conditions recorded in Katmandu.
- The warmest day in September was on September 18, 2014, with a maximum of 35°C (95°F).
- On September 28, 2024, Katmandu saw its coldest September day with temperatures maxing out at 19°C (66°F).
- Katmandu registered its coldest September night on September 13, 2014, with temperatures dropping to 12°C (54°F).
- The wettest day in September Katmandu was on September 28, 2024 with 194 mm (7.6 in) of precipitation.
Best Places in Nepal in September
Find out more about the weather in Nepal and which places have the best travel conditions in this month. See all of Nepal in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Katmandu in September
Warm but pleasant conditions in Katmandu in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Katmandu in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Nepal, check out our Katmandu's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Katmandu climate overview or explore weather in Nepal.
