Click on a day for an hourly weather forecast
The weather in Koh Ngai in September is hot. The average temperatures are between 22°C and 31°C.
There’s going to be many days of rain during the month of September in Koh Ngai.
Koh Ngai 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 Ngai in September 2025.
If you’re planning to visit Koh Ngai in the near future, we highly recommend that you review the 14 day weather forecast for Koh Ngai before you arrive.
Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
---|---|---|---|---|---|---|---|
January | 29° / 16° | 1 | 30 | 0 | 5 mm | Good | Koh Ngai in January |
February | 33° / 18° | 0 | 28 | 0 | 1 mm | Good | Koh Ngai in February |
March | 36° / 22° | 1 | 30 | 0 | 7 mm | Ok | Koh Ngai in March |
April | 37° / 24° | 4 | 26 | 0 | 17 mm | Ok | Koh Ngai in April |
May | 35° / 25° | 9 | 22 | 0 | 50 mm | Ok | Koh Ngai in May |
June | 32° / 23° | 12 | 19 | 0 | 49 mm | Good | Koh Ngai in June |
July | 31° / 23° | 14 | 17 | 0 | 67 mm | Ok | Koh Ngai in July |
August | 30° / 23° | 16 | 15 | 0 | 86 mm | Ok | Koh Ngai in August |
September | 31° / 22° | 15 | 15 | 0 | 83 mm | Ok | Koh Ngai in September |
October | 30° / 21° | 9 | 22 | 0 | 52 mm | Ok | Koh Ngai in October |
November | 30° / 19° | 2 | 28 | 0 | 10 mm | Good | Koh Ngai in November |
December | 28° / 16° | 1 | 30 | 0 | 4 mm | Perfect | Koh Ngai in December |