Chiang Mai monthly weather and climate
Chiang Mai · Northern Thailand · mountains
In Chiang Mai, January morning temperatures can fall to 15°C or lower, followed by clear days. In February and March, however, smoke from crop burning can make the sky hazy. Little rain doesn't necessarily mean clean air, so consider the timing of haze as well as the temperatures for your travel month.
4 mmJan9 mmFeb18 mmMar57 mmApr162 mmMay125 mmJun140 mmJul217 mmAug211 mmSep118 mmOct54 mmNov16 mmDec
When are the dry and rainy seasons?
- Best time to visit
- Nov–Feb
- Dry season
- Nov–Feb
- Rainy season
- May–Oct
- Hottest month
- Apr (36°C)
- Wettest month
- Aug (217 mm)
Monthly weather and climate
Use the table below to compare hotter and rainier months. These are historical climate averages, not a forecast for your travel dates or an indication that swimming is allowed or safe.
| Month | Travel rating | Temperature | Rainfall | Rainy days | Humidity | Sunshine | Sea conditions |
|---|---|---|---|---|---|---|---|
| January | ++ Very good | 15~29°C (59~84.2°F) | 4 mm | 1 days | 68% | 8.8 hours | Not applicable |
| February | ++ Very good | 17~32°C (62.6~89.6°F) | 9 mm | 1 days | 58% | 9.1 hours | Not applicable |
| March | ++ Very good | 20~35°C (68~95°F) | 18 mm | 2 days | 52% | 9.5 hours | Not applicable |
| April | + Good | 23~36°C (73.4~96.8°F) | 57 mm | 7 days | 57% | 9.3 hours | Not applicable |
| May | ± Average | 24~34°C (75.2~93.2°F) | 162 mm | 15 days | 71% | 6.4 hours | Not applicable |
| June | ± Average | 24~32°C (75.2~89.6°F) | 125 mm | 17 days | 77% | 5.2 hours | Not applicable |
| July | - Not recommended | 24~31°C (75.2~87.8°F) | 140 mm | 19 days | 79% | 3.9 hours | Not applicable |
| August | - Not recommended | 24~31°C (75.2~87.8°F) | 217 mm | 21 days | 81% | 3.8 hours | Not applicable |
| September | - Not recommended | 23~31°C (73.4~87.8°F) | 211 mm | 18 days | 81% | 4.8 hours | Not applicable |
| October | + Good | 22~30°C (71.6~86°F) | 118 mm | 12 days | 79% | 6.5 hours | Not applicable |
| November | + Good | 18~29°C (64.4~84.2°F) | 54 mm | 5 days | 75% | 7.2 hours | Not applicable |
| December | ++ Very good | 15~28°C (59~82.4°F) | 16 mm | 1 days | 73% | 8.2 hours | Not applicable |
| Month | Weather and travel advice |
|---|---|
| January | This is the coolest month of the year. Morning temperatures sometimes fall to 15°C or lower, while days are clear. |
| February | The weather is clear and dry, but smoke from crop burning begins to thicken. Low rainfall does not necessarily mean clean air. |
| March | Air pollution from crop burning is at its worst. The weather is hot and the sky looks hazy. |
| April | The hottest month coincides with Songkran. The source's notes describe this as the end of the smog season, but that does not mean the entire month is haze-free. |
| May | Rainy season begins, turning the mountains green. Smoke from crop burning decreases. |
| June | Rainy weather brings clear mornings followed by afternoon showers in the mountains. |
| July | Humidity and cloud cover are high. Temperatures cool and the surrounding landscape becomes lush and green. |
| August | This is the wettest month. Cloudy skies mean the fewest sunshine hours. |
| September | Rain continues, and rice is growing strongly in the fields. |
| October | Rain decreases, while the landscape stays green. |
| November | The dry season begins, bringing cooler evenings and clearer air. |
| December | The weather is cool and dry. Comfortable mornings are good for visiting temples. |