Chiang Saen Weather in September
What's the weather like in Chiang Saen (Chiang Rai) in September 2025?
The climate in Chiang Saen during September can be summarized as hot, humid and very wet.
September is in the fall / autumn in Chiang Saen and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (88°F), whilst at night 22°C (72°F) is normal.
| Daytime temperature | 31°C 87.8°F |
|---|---|
| Nightly temperature | 22.2°C 72°F |
| Average temperature | 26.6°C 79.9°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 229 mm 9 ins |
| Rainy days | 17 days |
| Sea temperature | 29.1°C 84.5°F |
| Humidity | 84% |
| Windspeed | 2.9kph 2 mph |
On average September is the 3rd wettest month of the year in Chiang Saen with around 229mm 9 inches of rain making it a very wet time to visit. This rainfall is typically spread over 17 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 Chiang Saen
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 Chiang Saen in September 2025.
Other monthly averages
Best places to visit in September
Chiang Saen weather stats
| Hottest month: | May | 33.2°C 91.8°F |
|---|---|---|
| Driest month: | February | 9mm 0.4ins |
| Sunniest month: | February | 9.4hrs |
| Coldest month: | December | 26.2°C 79.2°F |
| Wettest month: | August | 356mm 14ins |
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