Khao Chamao Weather in September
What's the weather like in Khao Chamao (Rayong) in September 2025?
The climate in Khao Chamao during September can be summarized as hot, humid and very wet.
September is in the fall / autumn in Khao Chamao and is typically the 6th coldest month of the year. Daytime maximum temperatures average around a steamy 31°C (87°F), whilst at night 24°C (75°F) is normal.
| Daytime temperature | 30.8°C 87.4°F |
|---|---|
| Nightly temperature | 24°C 75.2°F |
| Average temperature | 27.4°C 81.3°F |
| Daily sunshine | 5 hrs |
| Avg rainfall | 382 mm 15 ins |
| Rainy days | 21 days |
| Sea temperature | 29.2°C 84.5°F |
| Humidity | 84% |
| Windspeed | 5kph 3 mph |
On average September is the wettest month of the year in Khao Chamao with around 382mm 15 inches of rain making it a very wet time to visit. This rainfall is typically spread over 21 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 Khao Chamao
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 Khao Chamao in September 2025.
Other monthly averages
Best places to visit in September
Khao Chamao weather stats
| Hottest month: | April | 33.3°C 91.9°F |
|---|---|---|
| Driest month: | December | 11mm 0.4ins |
| Sunniest month: | December | 9.6hrs |
| Coldest month: | December | 30.6°C 87.1°F |
| Wettest month: | September | 382mm 15ins |
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