Weather in Chiang Mai in September
September in Chiang Mai is a hot month. Plan the serious walking for morning. The rest of the day wants shade and a slower pace.
In Thailand, this is how Chiang Mai actually wears September, not how a country centroid would. Compared with April and December, September sits in the middle of Chiang Mai's year.
- Average temp
- 28°C
24–32°C
- Rainfall
- 218 mm
A wet month
- Sunshine
- 5.1 h
hours per day
What to expect
Daytime
Hot days in Chiang Mai. Ruins, markets and hills are a morning job. Midday sightseeing is how people remember September for the wrong reason.
Nights stay warm. Air-con, if you can get it, is part of the brief. A jumper for September in Chiang Mai is almost always a waste of bag space.
Rain
September is the wet side of the year in Chiang Mai. Days can be heavy. Plans that cannot survive rain are the wrong plans.
This is not a reason to skip Chiang Mai if you like the place. It is a reason to pack for weather and to stop treating every grey hour as a failed holiday.
Evening
Evenings stay warm.
What to pack
Sun protection
Rain jacket
Where to stay in Chiang Mai
Dates are a starting point for September.
Travel guides for Chiang Mai
What to read before you book.
Average weather in Chiang Mai
TemperatureRainfall
Similar weather in September
Other destinations whose September averages sit close to this one.
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FAQs about Chiang Mai
Climate averages for Chiang Mai, 1991–2020.
The best time to visit Chiang Mai is between October and March, the most comfortable stretch of the year on these averages.
April is the hottest month, with an average around 30°C.
August is the wettest month, with about 234 mm of rain.
No. These are 1991–2020 climate normals from Meteostat, not a live forecast. Actual weather in any given week can differ.
