Kathmandu Weather in September

With daytime temperatures of 26°C (79°F) and nighttime lows of 19°C (66°F), September in Kathmandu brings high temperatures during the day. Do keep in mind that September is part of the rainy season, with frequent and often heavy rainfall.

Rainfall in Kathmandu in September

As part of the rainy season, Kathmandu sees around 10 days of rain in September, with an average of 336 mm (13 in). Showers during the rainy season tend to be heavy and can come down intensely. An umbrella is often not enough, so a poncho or waterproof jacket is a better choice.

Temperature in Kathmandu in September

September in Kathmandu brings high temperatures, with highs of 26°C (79°F) and nights around 19°C (66°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. 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 Kathmandu in September

The city usually sees around 133 hours of sunlight, indicating a moderately sunny period (despite it being part of rainy season).

Wind Speed in Kathmandu in September

September sees wind speeds averaging (). You'll typically experience very calm weather with minimal air movement throughout the month. Keep in mind this is an average. While most days are nearly windless, occasional windier days may still occur.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. March, April, October, November and December typically offer the best weather for Kathmandu.

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For a detailed overview over the year and the best time to visit Nepal, check out our Kathmandu's climate page.

Kathmandu Temperature in September

Min Temperature 19°C (66°F)  

Max Temperature 26°C (79°F)  

Chance of Rain 34%  

Precipitation 336 mm (13 in)  

Rainy days 10 days  

Humidity 82% *  

Windspeed () *  

Sunshine 133 hours *  

Percentage Sunshine *  

* Data from: Katmandu, Nepal (4 KM, 2 Miles).

Daily Historical Temperatures

30-year average (1988-2025)

Based on our historical records, temperatures in Kathmandu typically stay consistent throughout September, with daily highs averaging around 26°C (79°F). Nights are pleasant, with lows typically ranging from 18°C (64°F) to 20°C (68°F).

Average temperatures in September

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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

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Historical weather for Kathmandu in September

Browse day-by-day weather records for Kathmandu spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Kathmandu historical weather extremes in September

Based on 19 years of weather observations (2006-2025), these are the most extreme conditions recorded in Kathmandu.

• The hottest September day on record in Kathmandu reached 35°C (95°F) (September 18, 2014).
• On September 28, 2024, Kathmandu saw its coldest September day with temperatures maxing out at 19°C (66°F).
• The coldest night in September in Kathmandu was on September 13, 2014, with a minimum of 12°C (54°F).
• The heaviest September precipitation occurred on September 28, 2024, when 194 mm (7.6 in) of precipitation fell.

What to Wear in Kathmandu in September

Warm but pleasant conditions in Kathmandu 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. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Kathmandu in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Nepal, check out our Kathmandu's climate page.

More climate data for Kathmandu

Temperature Rainfall Sunshine Humidity Wind Speed

See the full Kathmandu climate overview or explore weather in Nepal.