Khon Kaen Weather in September
What's the weather like in Khon Kaen (Khon Kaen) in September 2025?
The climate in Khon Kaen during September can be summarized as hot, humid and very wet.
September is in the fall / autumn in Khon Kaen and is typically the 6th coldest month of the year. Daytime maximum temperatures average around a steamy 32°C (89°F), whilst at night 24°C (75°F) is normal.
| Daytime temperature | 31.7°C 89°F |
|---|---|
| Nightly temperature | 23.8°C 74.8°F |
| Average temperature | 27.7°C 81.9°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 239 mm 9.4 ins |
| Rainy days | 18 days |
| Sea temperature | 29°C 84.1°F |
| Humidity | 82% |
| Windspeed | 2.9kph 2 mph |
On average September is the wettest month of the year in Khon Kaen with around 239mm 9.4 inches of rain making it a very wet time to visit. This rainfall is typically spread over 18 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 Khon Kaen
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 Khon Kaen in September 2025.
Other monthly averages
Best places to visit in September
Khon Kaen weather stats
| Hottest month: | April | 36.1°C 97°F |
|---|---|---|
| Driest month: | December | 3mm 0.1ins |
| Sunniest month: | January | 9.7hrs |
| Coldest month: | December | 29.4°C 84.9°F |
| Wettest month: | September | 239mm 9.4ins |
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