Weather in Kathmandu in September 2025
Average weather
Average temperature in Kathmandu in September
Going from a maximum of +31°C during the day to a minimum of +20°C during the night, the temperature in September averages around +29°C.
The average maximum temperature goes down 9% by the end of the month, compared with the beginning of the month, from +29°C to +28°C.
Is Kathmandu warm or cold in September?
Kathmandu is typically warm in September.
Maximum temperatures go up compared to the previous month from +28°C to +28°C. The minimum temperature also goes down from +23°C to +21°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the warmest months in Kathmandu, here is the comparison with other months:
Climate in Kathmandu in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +28°C | +28°C | +26°C | ||||
| Min. temperature | ||||||
| +20°C | +17°C | +11°C | ||||
| Max. temperature | ||||||
| +33°C | +32°C | +32°C | ||||
| Rainfall | ||||||
| 567 mm | 292 mm | 76 mm | ||||
| Wind | ||||||
| 0 m/s | 0 m/s | 0 m/s | ||||
| Humidity | ||||||
| 87% | 86% | 80% | ||||
| Air pressure | ||||||
| 1005 HPa | 1009 HPa | 1013 HPa | ||||
| Sunny days | ||||||
| 0 | 0 | 6 | ||||
| Cloudy days | ||||||
| 0 | 0 | 5 | ||||
| Rainy days | ||||||
| 26 | 25 | 18 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. The temperature levels stay the same in the area of +28°C for average maximum temperature during the day. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 567 mm to 292 mm. It feels drier, as humidity decreases from 87% to 86%. The average wind speed doesn’t change much during September, staying around 0 m/s. The amount of sunny days stay about the same, averaging 0 sunny days during the month.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 1 m/s getting up to 2 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Kathmandu is gradually increasing during September, going from 1 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Kathmandu?
Climate Change over Years
The climate in Kathmandu in September has not changed much over the last 43 years.
The average temperature was the lowest in 1997 (+24°C) and the highest in 2009 (+26°C). The driest year was 1992 with only 1680 mm of rainfall, and the wettest year was 2021 with 3560 mm.
FAQ
Is September a good time to visit Kathmandu?
Can you sunbathe in Kathmandu in September?
Is Kathmandu rainy in September?
Is it sunny in Kathmandu in September?
Monthly weather in Kathmandu
Source of the data
For this page, we’ve looked at the typical weather in Kathmandu, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.