Chiang Mai weather by month
2006-2025, 20 years of records · Not a forecast Some months not station-calibrated
Chiang Mai is an inland northern city with a cool dry season from November to February, a hot season in March and April, and a rainy season from May to October. Rain is most frequent in August.
Towards the end of the dry season, from February to April, smoke from fires in fields and forests settles over the city, and March, with the most fires, is the peak. Check an air quality app when planning. The smoke clears in early May as the rains arrive.
December and January gave the best mix of comfortable warmth and few rain days in Chiang Mai. To dodge the rain, December to February (1 rain day) was the stretch to look at, not August (17).
Each month in a line
| JanuaryGood | properly hot, almost no rain | 30° / 16° |
|---|---|---|
| February | very hot | 33° / 17° |
| March | seriously hot, hardly any rain | 35° / 20° |
| April | very hot, only a little rain | 37° / 23° |
| May | seriously hot, rain on many days | 35° / 24° |
| June | very hot, frequent rain | 33° / 25° |
| July | seriously hot, rain every other day | 32° / 24° |
| August | very hot, rain on every second day | 32° / 24° |
| September | seriously hot, rain on every second day | 32° / 24° |
| October | seriously hot | 32° / 23° |
| November | hot, little rain | 31° / 20° |
| DecemberGood | properly hot, almost no rain | 29° / 17° |
The 12 months in numbers
Temperatures hardly moved: 37°C in April against 29°C in December.
| Month | High | Low | Rain days | Rainfall | Humidity | Clear days |
|---|---|---|---|---|---|---|
| January | 30° | 16° | 1 day | 14mm | 73% | 19 days |
| February | 33° | 17° | 1 day | 3mm | 62% | 21 days |
| March | 35° | 20° | 2 days | 20mm | 57% | 22 days |
| April | 37° | 23° | 5 days | 57mm | 57% | 15 days |
| May | 35° | 24° | 12 days | 181mm | 68% | 5 days |
| June | 33° | 25° | 11 days | 108mm | 73% | 0 days |
| July | 32° | 24° | 15 days | 162mm | 77% | 0 days |
| August | 32° | 24° | 17 days | 219mm | 82% | 0 days |
| September | 32° | 24° | 14 days | 198mm | 83% | 0 days |
| October | 32° | 23° | 10 days | 170mm | 83% | 4 days |
| November | 31° | 20° | 4 days | 52mm | 81% | 12 days |
| December | 29° | 17° | 1 day | 10mm | 78% | 16 days |
Enter your dates to see how that stretch went in each of the past 20 years.
Common questions
When is the best time to visit Chiang Mai?
December and January gave the best mix of comfortable warmth and few rain days in Chiang Mai. To dodge the rain, December to February (1 rain day) was the stretch to look at, not August (17).
Which month is driest in Chiang Mai?
February. Over 2006-2025 it averaged 1 rain day and 3 mm of rain.
Which month is warmest in Chiang Mai?
April, with highs averaging 37°C and lows 23°C. Temperatures hardly moved: 37°C in April against 29°C in December.