The temperatures in Koh Samet during September are extremely high, between 27°C and hot as 30°C, drinking water regularly is advisable.
There’s going to be many days of rain during the month of September in Koh Samet.
Koh Samet 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 Samet in September 2025.
If you’re planning to visit Koh Samet in the near future, we highly recommend that you review the 14 day weather forecast for Koh Samet before you arrive.
Temperatures
30° / 27°
Rainy Days
19
Snowy Days
0
Dry Days
11
Rainfall
563
mm
Sun Hours
10.4
Hrs
