Chiang Rai Weather in September
Thailand · 30-year monthly averages
⚠️ Challenging time to visit
September in Chiang Rai is hot, with average daytime highs around 31°C (89°F) and nighttime lows near 23°C (74°F). Expect roughly 275mm of precipitation spread over about 15 rainy days, and heavy rainfall is common — this is peak wet season territory.
Avg high
31°C
89°F
Avg low
23°C
74°F
Rainfall
275mm
very wet
Rainy days
15
days with ≥1mm
☀️ About 163 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 Rai in September?
- September in Chiang Rai is hot, with average daytime highs around 31°C (89°F) and nighttime lows near 23°C (74°F). Expect roughly 275mm 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 Rai in September?
- Chiang Rai sees around 275mm of precipitation in September on average — very wet by global standards.
- Is September a good time to visit Chiang Rai?
- September is a challenging month to visit Chiang Rai weather-wise — plan around the conditions.