Negombo Weather in September
What's the weather like in Negombo (Western) in September 2025?
The climate in Negombo during September can be summarized as hot, humid and wet.
September is in the fall / autumn in Negombo and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (88°F), whilst at night 25°C (76°F) is normal.
| Daytime temperature | 31°C 87.7°F |
|---|---|
| Nightly temperature | 24.7°C 76.4°F |
| Average temperature | 27.8°C 82°F |
| Daily sunshine | 6.6 hrs |
| Avg rainfall | 187 mm 7.4 ins |
| Rainy days | 12 days |
| Sea temperature | 27.4°C 81.3°F |
| Humidity | 78% |
| Windspeed | 11.2kph 7 mph |
On average September is the 5th wettest month of the year in Negombo with around 187mm 7.4 inches of rain making it a wet time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.6 hours of sunshine per day.
September temperatures in Negombo
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 Negombo in September 2025.
Other monthly averages
Best places to visit in September
Negombo weather stats
| Hottest month: | April | 32.4°C 90.3°F |
|---|---|---|
| Driest month: | January | 48mm 1.9ins |
| Sunniest month: | March | 9.2hrs |
| Coldest month: | January | 30.9°C 87.6°F |
| Wettest month: | October | 351mm 13.8ins |
© Google
Locations nearby
Top Sri Lanka locations
- Anuradhapura
- Bentota
- Beruwala
- Colombo
- Dambulla
- Galle
- Hikkaduwa
- Kalutara
- Kandy
- Negombo
- Nuwara Eliya
- Tangalla
- Trincomalee