Chilaw Weather in September
What's the weather like in Chilaw (North Western) in September 2025?
The climate in Chilaw during September can be summarized as very hot, humid and wet.
September is in the fall / autumn in Chilaw and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (88°F), whilst at night 25°C (77°F) is normal.
| Daytime temperature | 31.3°C 88.4°F |
|---|---|
| Nightly temperature | 24.8°C 76.6°F |
| Average temperature | 28.1°C 82.5°F |
| Daily sunshine | 6.6 hrs |
| Avg rainfall | 122 mm 4.8 ins |
| Rainy days | 9 days |
| Sea temperature | 27.4°C 81.3°F |
| Humidity | 76% |
| Windspeed | 11.9kph 7 mph |
On average September is the 6th wettest month of the year in Chilaw with around 122mm 4.8 inches of rain making it a wet time to visit. This rainfall is typically spread over 9 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 Chilaw
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 Chilaw in September 2025.
Other monthly averages
Best places to visit in September
Chilaw weather stats
| Hottest month: | May | 31.9°C 89.4°F |
|---|---|---|
| Driest month: | August | 43mm 1.7ins |
| Sunniest month: | March | 9.2hrs |
| Coldest month: | January | 30.7°C 87.3°F |
| Wettest month: | October | 314mm 12.4ins |
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