The temperatures in Koh Phangan during September are extremely high, between 27°C and hot as 29°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Koh Phangan. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Koh Phangan in September 2025.
If you’re planning to visit Koh Phangan in the near future, we highly recommend that you review the 14 day weather forecast for Koh Phangan before you arrive.
Temperatures
29° / 27°
Rainy Days
10
Snowy Days
0
Dry Days
20
Rainfall
188
mm
Sun Hours
10.9
Hrs
