Chiang Mai Weather in September
Thailand · 30-year monthly averages
⚠️ Challenging time to visit
September in Chiang Mai is hot, with average daytime highs around 32°C (90°F) and nighttime lows near 24°C (75°F). Expect roughly 207mm of precipitation spread over about 15 rainy days, and heavy rainfall is common — this is peak wet season territory.
Avg high
32°C
90°F
Avg low
24°C
75°F
Rainfall
207mm
very wet
Rainy days
15
days with ≥1mm
☀️ About 153 hours of sunshine over the month (~5h/day).
🎒 What to pack
- breathable summer clothing
- sunscreen, hat and sunglasses
- refillable water bottle
- compact umbrella or rain jacket
September vs the rest of the year
FAQ
- How hot is Chiang Mai in September?
- September in Chiang Mai is hot, with average daytime highs around 32°C (90°F) and nighttime lows near 24°C (75°F). Expect roughly 207mm of precipitation spread over about 15 rainy days, and heavy rainfall is common — this is peak wet season territory.
- Does it rain a lot in Chiang Mai in September?
- Chiang Mai sees around 207mm of precipitation in September on average — very wet by global standards.
- Is September a good time to visit Chiang Mai?
- September is a challenging month to visit Chiang Mai weather-wise — plan around the conditions.