Click on a day for an hourly weather forecast
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.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 27° / 26° | 8 | 23 | 0 | 326 mm | Good | Koh Phangan in January |
| February | 28° / 26° | 3 | 25 | 0 | 87 mm | Perfect | Koh Phangan in February |
| March | 28° / 27° | 5 | 26 | 0 | 178 mm | Perfect | Koh Phangan in March |
| April | 29° / 28° | 7 | 23 | 0 | 171 mm | Ok | Koh Phangan in April |
| May | 30° / 28° | 7 | 24 | 0 | 155 mm | Ok | Koh Phangan in May |
| June | 30° / 28° | 9 | 21 | 0 | 184 mm | Ok | Koh Phangan in June |
| July | 29° / 27° | 8 | 23 | 0 | 163 mm | Ok | Koh Phangan in July |
| August | 29° / 27° | 8 | 23 | 0 | 150 mm | Ok | Koh Phangan in August |
| September | 29° / 27° | 10 | 20 | 0 | 188 mm | Ok | Koh Phangan in September |
| October | 29° / 27° | 14 | 17 | 0 | 368 mm | Ok | Koh Phangan in October |
| November | 29° / 27° | 17 | 13 | 0 | 565 mm | Ok | Koh Phangan in November |
| December | 28° / 27° | 11 | 20 | 0 | 368 mm | Good | Koh Phangan in December |