Bintulu Weather in September
What's the weather like in Bintulu (Sarawak) in September 2025?
The climate in Bintulu during September can be summarized as hot, humid and very wet.
September is in the fall / autumn in Bintulu and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (87°F), whilst at night 23°C (73°F) is normal.
| Daytime temperature | 30.8°C 87.4°F |
|---|---|
| Nightly temperature | 22.8°C 73°F |
| Average temperature | 26.8°C 80.2°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 290 mm 11.4 ins |
| Rainy days | 22 days |
| Sea temperature | 29.6°C 85.3°F |
| Humidity | 85% |
| Windspeed | 4kph 2 mph |
On average September is the 5th wettest month of the year in Bintulu with around 290mm 11.4 inches of rain making it a very wet time to visit. This rainfall is typically spread over 22 days, although this may vary considerably.
On the flip side this corresponds to an average of 6 hours of sunshine per day.
September temperatures in Bintulu
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 Bintulu in September 2025.
Other monthly averages
Best places to visit in September
Bintulu weather stats
| Hottest month: | May | 31°C 87.8°F |
|---|---|---|
| Driest month: | May | 231mm 9.1ins |
| Sunniest month: | May | 7hrs |
| Coldest month: | January | 29.1°C 84.4°F |
| Wettest month: | December | 425mm 16.7ins |
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