Best Time to Visit Chiang Mai
The best time to visit Chiang Mai is November to April, when the average temperature is 19–27°C and rainfall is low for Chiang Mai, at 5–63 mm a month.
Chiang Mai weather by month
The wettest month in Chiang Mai is August with 237 mm of rain, and the warmest is April at an average 27°C. The coolest is December at 19°C.
| Month | Average temperature | Rainfall | Verdict |
|---|---|---|---|
| January | 19°C / 67°F | 15 mm | Best |
| February | 22°C / 71°F | 5 mm | Best |
| March | 25°C / 76°F | 23 mm | Best |
| April | 27°C / 81°F | 63 mm | Best |
| May | 26°C / 78°F | 189 mm | Wet |
| June | 25°C / 77°F | 141 mm | Rainy |
| July | 24°C / 76°F | 178 mm | Wet |
| August | 24°C / 75°F | 237 mm | Wet |
| September | 24°C / 74°F | 222 mm | Wet |
| October | 23°C / 73°F | 123 mm | Rainy |
| November | 21°C / 69°F | 37 mm | Best |
| December | 19°C / 66°F | 13 mm | Best |
How we pick the best months
- Best: an average temperature of 15–28°C and low rainfall for Chiang Mai: under 150 mm, and no more than 116 mm, a quarter above Chiang Mai's median month (never set below 60 mm).
- If no month qualifies, we show the three driest months that average 10–30°C instead.
- Wet: 150 mm of rain or more. Rainy: more than 116 mm. Hot: 29°C or more on average. Cool: under 15°C. Cold: under 5°C.
Averages cover day and night, so afternoons are warmer than the figure shown. Weather is only one reason to pick a month: school holidays, festivals and prices matter too.
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Where these numbers come from
Monthly averages for January 2001 – December 2020 from the NASA POWER project, for the area around Chiang Mai International (CNX) at 18.77, 98.96. The model covers a grid about 50 km across, so a coastal or hilly spot can run a degree or two different. Retrieved 12 September 2026.
The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center (LaRC) Prediction of Worldwide Energy Resource (POWER) Project funded through the NASA Earth Science/Applied Science Program.