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Best time to visit · Thailand
For the most comfortable weather in Chiang Mai, aim for December & January. January tops our comfort score at 94/100, with highs around 83°F (28°C) and 0.6 in (15 mm) of rain. February and November are good shoulder-season months. The toughest months are May and August & September, mainly because of cloud cover.
Highs run from 81°F to 98°F across the year, and the yearly total is about 49.1 in (1246 mm) of rain.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 83°F28°C | 90°F32°C | 95°F35°C | 98°F37°C | 93°F34°C | 90°F32°C | 88°F31°C | 87°F30°C | 86°F30°C | 85°F29°C | 83°F28°C | 81°F27°C |
| Avg low | 61°F16°C | 63°F17°C | 67°F20°C | 74°F23°C | 75°F24°C | 74°F24°C | 74°F23°C | 74°F23°C | 74°F23°C | 71°F22°C | 67°F19°C | 62°F17°C |
| Rain | 0.6 in15 mm | 0.2 in5 mm | 0.9 in23 mm | 2.5 in63 mm | 7.4 in189 mm | 5.6 in141 mm | 7.0 in178 mm | 9.3 in237 mm | 8.7 in222 mm | 4.8 in123 mm | 1.5 in37 mm | 0.5 in13 mm |
| Humidity | 67% | 56% | 52% | 56% | 75% | 81% | 83% | 87% | 89% | 87% | 82% | 76% |
| Cloud | 28% | 21% | 32% | 47% | 80% | 94% | 95% | 95% | 89% | 69% | 41% | 34% |
| Comfort | 94 | 80 | 67 | 52 | 35 | 39 | 37 | 31 | 33 | 55 | 82 | 93 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. Temperatures were adjusted from the grid cell's ~759 m (2,490 ft) to Chiang Mai's ~314 m (1,030 ft) elevation using the standard lapse rate of 6.5°C per 1,000 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
Close to the tropics, rain does as much as temperature to shape the year in Chiang Mai.
Expect steady highs of 81–98°F (27–37°C). It's the driest half, with only about 6.1 in (156 mm) of rain, 13% of the year's total. November & December feel humid, with humidity near 82%. Comfort peaks here: December & January rank with the year's best, and the season averages 78/100.
Temperatures slide from 93°F highs in May to 85°F by October. It's the wettest half, with about 42.9 in (1090 mm) of rain, 87% of the year's total. May – October feel humid, with humidity near 75%. Comfort scores bottom out in May and August & September; the season averages 38/100.
By comfort score: 4 Great, 1 Good, 2 Fair and 5 Tough. Great months: November – February. Tap a month for its own guide.
For the most comfortable weather in Chiang Mai, aim for December & January. January tops our comfort score at 94/100, with highs around 83°F (28°C) and 0.6 in (15 mm) of rain. February and November are good shoulder-season months. The toughest months are May and August & September, mainly because of cloud cover.
August is the wettest month, averaging about 9.3 in (237 mm) of rain. February is the driest, with about 0.2 in (5 mm). The yearly total is around 49.1 in (1246 mm).
January is the coldest, with average lows of 61°F (16°C) and highs of 83°F (28°C). The warmest is April, with average highs of 98°F (37°C).
Yes for much of the year: humidity averages 74% annually, and May – December combine warmth with 75%+ humidity, which feels sticky.
The wettest three-month stretch is July – September, with about 25.1 in (637 mm) of rain combined. The driest stretch is December – February, with about 1.3 in (33 mm).
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