The temperatures in Koh Lanta during September are extremely high, between 27°C and hot as 29°C, drinking water regularly is advisable.
There’s going to be many days of rain during the month of September in Koh Lanta.
Koh Lanta should expect an average of 15 to 22 days of rain, so be sure to bring along a waterproof jacket to stay dry this month!
Our weather forecast can give you a great sense of what weather to expect in Koh Lanta in September 2025.
If you’re planning to visit Koh Lanta in the near future, we highly recommend that you review the 14 day weather forecast for Koh Lanta before you arrive.
Temperatures
29° / 27°
Rainy Days
17
Snowy Days
0
Dry Days
13
Rainfall
495
mm
Sun Hours
10.8
Hrs
