Click on a day for an hourly weather forecast
The weather in Chiang Rai in September is hot. The average temperatures are between 22°C and 32°C.
There’s going to be many days of rain during the month of September in Chiang Rai.
Chiang Rai 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 Chiang Rai in September 2025.
If you’re planning to visit Chiang Rai in the near future, we highly recommend that you review the 14 day weather forecast for Chiang Rai before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 29° / 14° | 1 | 30 | 0 | 22 mm | Good | Chiang Rai in January |
| February | 34° / 16° | 0 | 28 | 0 | 8 mm | Ok | Chiang Rai in February |
| March | 37° / 21° | 1 | 30 | 0 | 20 mm | Ok | Chiang Rai in March |
| April | 38° / 24° | 1 | 29 | 0 | 45 mm | Bad | Chiang Rai in April |
| May | 36° / 24° | 7 | 24 | 0 | 212 mm | Bad | Chiang Rai in May |
| June | 32° / 23° | 15 | 15 | 0 | 347 mm | Ok | Chiang Rai in June |
| July | 30° / 23° | 22 | 9 | 0 | 471 mm | Ok | Chiang Rai in July |
| August | 31° / 22° | 20 | 11 | 0 | 472 mm | Ok | Chiang Rai in August |
| September | 32° / 22° | 15 | 15 | 0 | 308 mm | Ok | Chiang Rai in September |
| October | 31° / 20° | 6 | 25 | 0 | 109 mm | Good | Chiang Rai in October |
| November | 31° / 17° | 1 | 29 | 0 | 43 mm | Good | Chiang Rai in November |
| December | 29° / 15° | 1 | 30 | 0 | 24 mm | Good | Chiang Rai in December |