Thailand · 30-year monthly climate averages
Based on 30 years of climate data, the most comfortable months to visit Chiang Mai are January, November and December, when daytime temperatures are agreeable and rainfall is relatively low.
Chiang Mai sees its warmest weather in April, when daytime highs average around 37°C, and its coolest in December (around 29°C).
Annual precipitation totals roughly 1139mm — August is typically the wettest month (~223mm) and February the driest (~10mm).
A distinctly wetter period runs from May to October — worth planning around if you prefer dry days.
March is the sunniest month, with about 268 hours of sunshine.
🟧 avg daytime high · 🟦 dashed: avg nighttime low · bars: monthly rainfall
Daily forecast highs vs the 30-year normal — last 60 days
Each bar is one day: orange above normal, blue below.
| Month | High / Low | Rainfall | Travel rating |
|---|---|---|---|
| January | 30° / 16°C | 11mm | 👍 Good |
| February | 33° / 17°C | 10mm | 👍 Good |
| March | 35° / 20°C | 20mm | 🤔 Fair |
| April | 37° / 23°C | 54mm | 🤔 Fair |
| May | 35° / 24°C | 168mm | ⚠️ Challenging |
| June | 33° / 25°C | 118mm | 🤔 Fair |
| July | 32° / 24°C | 149mm | 🤔 Fair |
| August | 32° / 24°C | 223mm | ⚠️ Challenging |
| September | 32° / 24°C | 207mm | ⚠️ Challenging |
| October | 32° / 23°C | 124mm | 🤔 Fair |
| November | 31° / 20°C | 41mm | 👍 Good |
| December | 29° / 17°C | 14mm | 🌟 Great |
January in Chiang Mai is hot, with average daytime highs around 30°C (86°F) and nighttime lows near 16°C (60°F). Expect roughly 11mm of precipitation spread over about 1 rainy days, and rain is rare.
☀️ About 258 hours of sunshine over the month (~9h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
February in Chiang Mai is hot, with average daytime highs around 33°C (91°F) and nighttime lows near 17°C (62°F). Expect roughly 10mm of precipitation spread over about 1 rainy days, and rain is rare.
☀️ About 252 hours of sunshine over the month (~8h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
March in Chiang Mai is extremely hot, with average daytime highs around 35°C (96°F) and nighttime lows near 20°C (68°F). Expect roughly 20mm of precipitation spread over about 2 rainy days, with little rainfall.
☀️ About 268 hours of sunshine over the month (~9h/day).
🎒 What to pack — very light, loose clothing · high-SPF sunscreen and a sun hat · plan activities for early morning or evening
April in Chiang Mai is extremely hot, with average daytime highs around 37°C (98°F) and nighttime lows near 23°C (74°F). Expect roughly 54mm of precipitation spread over about 5 rainy days, with little rainfall.
☀️ About 253 hours of sunshine over the month (~8h/day).
🎒 What to pack — very light, loose clothing · high-SPF sunscreen and a sun hat · plan activities for early morning or evening
May in Chiang Mai is hot, with average daytime highs around 35°C (94°F) and nighttime lows near 24°C (76°F). Expect roughly 168mm of precipitation spread over about 12 rainy days, and this is one of the wetter months.
☀️ About 217 hours of sunshine over the month (~7h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
June in Chiang Mai is hot, with average daytime highs around 33°C (92°F) and nighttime lows near 25°C (76°F). Expect roughly 118mm of precipitation spread over about 12 rainy days, and this is one of the wetter months.
☀️ About 146 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
July in Chiang Mai is hot, with average daytime highs around 32°C (90°F) and nighttime lows near 24°C (76°F). Expect roughly 149mm of precipitation spread over about 14 rainy days, and this is one of the wetter months.
☀️ About 115 hours of sunshine over the month (~4h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
August in Chiang Mai is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 24°C (75°F). Expect roughly 223mm of precipitation spread over about 17 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 111 hours of sunshine over the month (~4h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
September in Chiang Mai is hot, with average daytime highs around 32°C (90°F) and nighttime lows near 24°C (75°F). Expect roughly 207mm of precipitation spread over about 15 rainy days, and heavy rainfall is common — this is peak wet season territory.
☀️ About 153 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
October in Chiang Mai is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 23°C (73°F). Expect roughly 124mm of precipitation spread over about 9 rainy days, and this is one of the wetter months.
☀️ About 196 hours of sunshine over the month (~7h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
November in Chiang Mai is hot, with average daytime highs around 31°C (87°F) and nighttime lows near 20°C (68°F). Expect roughly 41mm of precipitation spread over about 3 rainy days, with little rainfall.
☀️ About 229 hours of sunshine over the month (~8h/day).
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
December in Chiang Mai is warm, with average daytime highs around 29°C (85°F) and nighttime lows near 17°C (62°F). Expect roughly 14mm of precipitation spread over about 1 rainy days, and rain is rare.
☀️ About 238 hours of sunshine over the month (~8h/day).
🎒 What to pack — light summer clothing · sunscreen and sunglasses