Ko Lanta Weather in September
What's the weather like in Ko Lanta (Krabi) in September 2025?
The climate in Ko Lanta during September can be summarized as hot, humid and very wet.
September is in the fall / autumn in Ko Lanta and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a steamy 30°C (87°F), whilst at night 24°C (76°F) is normal.
| Daytime temperature | 30.4°C 86.7°F |
|---|---|
| Nightly temperature | 24.2°C 75.6°F |
| Average temperature | 27.3°C 81.1°F |
| Daily sunshine | 5.9 hrs |
| Avg rainfall | 365 mm 14.4 ins |
| Rainy days | 22 days |
| Sea temperature | 29.3°C 84.8°F |
| Humidity | 84% |
| Windspeed | 7.2kph 5 mph |
On average September is the wettest month of the year in Ko Lanta with around 365mm 14.4 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 5.9 hours of sunshine per day.
September temperatures in Ko Lanta
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 Ko Lanta in September 2025.
Other monthly averages
Best places to visit in September
Ko Lanta weather stats
| Hottest month: | March | 33.9°C 93°F |
|---|---|---|
| Driest month: | February | 26mm 1ins |
| Sunniest month: | February | 9.5hrs |
| Coldest month: | December | 30.7°C 87.3°F |
| Wettest month: | September | 365mm 14.4ins |
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