Climate in Chiang Mai — Annual Weather Overview
Chiang Mai has a subtropical climate — hot summers, mild winters, rainfall spread throughout the year. The hottest month is April (average high 34.8°C) and the coolest is December (27.4°C). Temperatures are consistent year-round, with highs ranging only 7.4°C between the warmest and coolest months. Annual rainfall totals around 2052mm. September is the wettest month at 424.5mm, while January averages just 12.1mm. Average daily sunshine is 9.9 hours.
**Spring (March, April, May):** average highs 34.3°C, 300mm rain. **Summer (June, July, August):** average highs 30.7°C, 980mm rain. **Autumn (September, October, November):** average highs 29.1°C, 692mm rain. **Winter (December, January, February):** average highs 28.4°C, 80mm rain.
Chiang Mai — Monthly Temperatures
Chiang Mai — Monthly Rainfall
✅ Best months to visit
All year
ℹ️ No months to avoid
Weather in Chiang Mai stays reasonable all year.
Chiang Mai weather by month
| Month | High | Low | Rain | Sun/day | Rainy days | Rating |
|---|---|---|---|---|---|---|
| January | 27.7°C | 16.4°C | 12.1mm | 10.7h | 2 | 10/10 |
| February | 30.0°C | 17.8°C | 47.1mm | 10.7h | 2 | 10/10 |
| March | 34.5°C | 21.3°C | 15.3mm | 10.7h | 2 | 10/10 |
| April | 34.8°C | 23.2°C | 94.1mm | 10.6h | 9 | 10/10 |
| May | 33.7°C | 24.4°C | 191.0mm | 10.8h | 20 | 9/10 |
| June | 31.9°C | 24.1°C | 219.9mm | 9.3h | 26 | 8/10 |
| July | 30.7°C | 23.9°C | 343.1mm | 9.3h | 28 | 8/10 |
| August | 29.6°C | 23.6°C | 416.6mm | 7.6h | 30 | 8/10 |
| September | 29.4°C | 23.2°C | 424.5mm | 8.6h | 26 | 8/10 |
| October | 28.9°C | 22.1°C | 203.4mm | 9.4h | 19 | 8/10 |
| November | 29.0°C | 20.3°C | 64.5mm | 10.4h | 10 | 10/10 |
| December | 27.4°C | 17.5°C | 20.8mm | 10.6h | 2 | 10/10 |
For the full verdict on when to go, see the best time to visit Chiang Mai and the Chiang Mai rainy season guide. Seasonal breakdowns: spring, summer, autumn and winter.
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Frequently Asked Questions
What type of climate does Chiang Mai have?
Chiang Mai has a subtropical climate — hot summers, mild winters, rainfall spread throughout the year. Average highs range from 27.4°C in December to 34.8°C in April.
What is the hottest month in Chiang Mai?
April is the hottest month in Chiang Mai, with average highs of 34.8°C and lows of 23.2°C.
What is the coldest month in Chiang Mai?
December is the coolest month, with average highs of 27.4°C and lows of 16.4°C.
What is the wettest month in Chiang Mai?
September is the wettest month, averaging 424.5mm of rainfall over around 26 rainy days.
When is rainy season in Chiang Mai?
Rainy season in Chiang Mai runs May to October, when rainfall is significantly higher than the rest of the year. Full rainy season guide →
How much rain does Chiang Mai get per year?
Chiang Mai receives around 2052mm of rain per year. The driest month is January (12.1mm).
When is the best time to visit Chiang Mai?
The best time to visit Chiang Mai is All year. See the full month-by-month guide →
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For the packing side of things, our sister site has a ready-made checklist: Chiang Mai packing list at 247PackingList. For currency, language and country facts see the Thailand guide at 247CountryInfo. Some travellers fund a longer stay in Chiang Mai by teaching English along the way — a TEFL certificate is usually all it takes.
Trip essentials for Chiang Mai
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.