Click on a day for an hourly weather forecast
The weather in Chiang Mai in September is hot. The average temperatures are between 22°C and 32°C.
You can expect about 3 to 8 days of rain in Chiang Mai during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Chiang Mai in September 2025.
If you’re planning to visit Chiang Mai in the near future, we highly recommend that you review the 14 day weather forecast for Chiang Mai before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 30° / 15° | 1 | 31 | 0 | 10 mm | Good | Chiang Mai in January |
| February | 34° / 17° | 0 | 28 | 0 | 3 mm | Ok | Chiang Mai in February |
| March | 37° / 21° | 0 | 31 | 0 | 14 mm | Ok | Chiang Mai in March |
| April | 39° / 24° | 1 | 29 | 0 | 32 mm | Bad | Chiang Mai in April |
| May | 37° / 24° | 4 | 27 | 0 | 117 mm | Ok | Chiang Mai in May |
| June | 33° / 23° | 6 | 24 | 0 | 122 mm | Good | Chiang Mai in June |
| July | 31° / 22° | 10 | 21 | 0 | 184 mm | Ok | Chiang Mai in July |
| August | 31° / 22° | 8 | 23 | 0 | 190 mm | Ok | Chiang Mai in August |
| September | 32° / 22° | 7 | 23 | 0 | 131 mm | Ok | Chiang Mai in September |
| October | 31° / 20° | 3 | 28 | 0 | 58 mm | Good | Chiang Mai in October |
| November | 31° / 18° | 1 | 29 | 0 | 24 mm | Good | Chiang Mai in November |
| December | 29° / 15° | 0 | 31 | 0 | 11 mm | Good | Chiang Mai in December |