Trincomalee Weather in September
What's the weather like in Trincomalee (Eastern Province) in September 2025?
The climate in Trincomalee during September can be summarized as very hot and a little damp.
September is in the fall / autumn in Trincomalee and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a warm 34°C (93°F), whilst at night 25°C (78°F) is normal.
| Daytime temperature | 34°C 93.1°F |
|---|---|
| Nightly temperature | 25.3°C 77.5°F |
| Average temperature | 29.6°C 85.3°F |
| Daily sunshine | 7.3 hrs |
| Avg rainfall | 96 mm 3.8 ins |
| Rainy days | 6 days |
| Sea temperature | 28.9°C 84.1°F |
| Humidity | 68% |
| Windspeed | 13.7kph 9 mph |
On average September is the 6th wettest month of the year in Trincomalee with around 96mm 3.8 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.3 hours of sunshine per day.
September temperatures in Trincomalee
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 Trincomalee in September 2025.
Other monthly averages
Best places to visit in September
Trincomalee weather stats
| Hottest month: | June | 34.6°C 94.3°F |
|---|---|---|
| Driest month: | June | 25mm 1ins |
| Sunniest month: | March | 9.2hrs |
| Coldest month: | January | 27.8°C 82°F |
| Wettest month: | December | 367mm 14.4ins |
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