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.
Temperatures
32° / 22°
Rainy Days
15
Snowy Days
0
Dry Days
15
Rainfall
308
mm
Sun Hours
10.1
Hrs
