When to go · Chiang Mai
Chiang Mai in September
Avoid month. Outside the best window (Nov–Jan (cooler and dry)). Across Thailand: Wettest month in Bangkok and on the Andaman coast; flooding in low areas. Only for low prices.
Key facts
- Verdict
- Avoid
- Temperature
- 31°C88°F / 24°C75°F
- average high / low
- Rain days
- 19
- Crowds
- Low
- Thailand overall
- Prices
- Low
- Thailand overall
Verdict
AvoidThailand month rating
Outside the best window (Nov–Jan (cooler and dry)). Across Thailand: Wettest month in Bangkok and on the Andaman coast; flooding in low areas. Only for low prices.
Weather in September
- Chiang MaiHighs around 31 °C, lows around 24 °C, rain on about 19 daysHighs around 88 °F, lows around 75 °F, rain on about 19 days
- North, Thailand · Chiang Mai, Chiang Rai, Pairainy
Cool nights Dec–Jan; the burning season (Feb–Apr) puts air quality among the worst in Asia — check AQI before booking.
Crowds and prices
- Crowds · Thailand overall
- Low
- Prices · Thailand overall
- Low
Thailand overall: Wettest month in Bangkok and on the Andaman coast; flooding in low areas. Only for low prices.
What to pack
- Light, breathable clothes, a sun hat and sunscreen
- A rain jacket or umbrella and shoes that dry fast