Gangtok Weather in September
What's the weather like in Gangtok (Sikkim) in September 2025?
The climate in Gangtok during September can be summarized as warm, humid and very wet.
September is in the fall / autumn in Gangtok and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 25°C (78°F), whilst at night 18°C (64°F) is normal.
| Daytime temperature | 25.4°C 77.7°F |
|---|---|
| Nightly temperature | 17.8°C 64°F |
| Average temperature | 21.6°C 70.9°F |
| Daily sunshine | 5 hrs |
| Avg rainfall | 438 mm 17.3 ins |
| Rainy days | 11 days |
| Sea temperature | 25.6°C 78.2°F |
| Humidity | 87% |
| Windspeed | 3.6kph 2 mph |
On average September is the 4th wettest month of the year in Gangtok with around 438mm 17.3 inches of rain making it a very wet time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.
On the flip side this corresponds to an average of 5 hours of sunshine per day.
September temperatures in Gangtok
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Gangtok in September 2025.
Other monthly averages
Best places to visit in September
Gangtok weather stats
| Hottest month: | August | 25.8°C 78.4°F |
|---|---|---|
| Driest month: | December | 8mm 0.3ins |
| Sunniest month: | January | 7.6hrs |
| Coldest month: | January | 15.9°C 60.6°F |
| Wettest month: | July | 825mm 32.5ins |
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