Chiang Mai · Thailand · 1995–2024 averages
Chiang Mai weather, month by month. January is the pick.
Thirty years of averages for Chiang Mai, Thailand — how hot it really feels, when the rain arrives, and what the air is like. January comes out on top; May is the one to skip.
The year at a glance
Tap a month for its full breakdown.
January
bestscore 77.3/100Warm, sticky and dry, with moderate air.
- Feels like
- 30°
- warm
- Real temp
- 28°
- warm
- Humidity
- 68%
- sticky
- Rain
- 11mm
- dry
- Cloud cover
- 27%
- clear
- Air quality
- 82
- moderate
- Daylight
- 11.1h
- shortish
Month by month, metric by metric
Each row is one measure across the same twelve months. The tint says how good that month is for it, the word says why.
- Good
- Okay
- Rough
- Grim
Feels like
peaks at 39° in April
- Jan30°warm
- Feb32°warm
- Mar36°hot
- Apr39°scorching
- May38°scorching
- Jun36°hot
- Jul35°hot
- Aug35°hot
- Sep35°hot
- Oct34°hot
- Nov32°warm
- Dec29°warm
Real temp
27–36° in the shade across the year
- Jan28°warm
- Feb31°warm
- Mar34°hot
- Apr36°hot
- May33°hot
- Jun31°warm
- Jul30°warm
- Aug29°warm
- Sep29°warm
- Oct29°warm
- Nov28°warm
- Dec27°mild
Humidity
51% at its driest, 87% at its most oppressive
- Jan68%sticky
- Feb56%comfy
- Mar51%comfy
- Apr55%comfy
- May72%sticky
- Jun80%sweaty
- Jul84%sweaty
- Aug86%soupy
- Sep87%soupy
- Oct84%sweaty
- Nov78%sweaty
- Dec73%sticky
Rain
276mm in August, 9mm in February
- Jan11mmdry
- Feb9mmdry
- Mar13mmdry
- Apr37mmdryish
- May135mmrainy
- Jun145mmrainy
- Jul221mmsoaking
- Aug276mmsoaking
- Sep269mmsoaking
- Oct132mmrainy
- Nov32mmdryish
- Dec12mmdry
Cloud cover
20% at its clearest, 93% at its greyest
- Jan27%clear
- Feb20%clear
- Mar24%clear
- Apr37%bright
- May70%grey
- Jun91%overcast
- Jul92%overcast
- Aug93%overcast
- Sep85%overcast
- Oct62%mixed
- Nov41%bright
- Dec33%clear
Air quality
worst in March, cleanest in July
- Jan82moderate
- Feb88moderate
- Mar101poor
- Apr97moderate
- May71moderate
- Jun55moderate
- Jul49clean
- Aug54moderate
- Sep61moderate
- Oct72moderate
- Nov81moderate
- Dec83moderate
Daylight
11h to 13.2h of daylight across the year
- Jan11.1hshortish
- Feb11.5hshortish
- Mar12heven
- Apr12.6heven
- May13heven
- Jun13.2heven
- Jul13.1heven
- Aug12.8heven
- Sep12.2heven
- Oct11.7hshortish
- Nov11.3hshortish
- Dec11hshortish
Chiang Mai's air changes sharply through the year
The air is at its worst in March at 101 AQI (poor), and at its cleanest in July at 49 (clean). The dirtiest months here are also the driest.
Every month in full
All twelve months, all seven measures.
| Month | Feels like | Real temp | Humidity | Rain | Cloud cover | Air quality | Daylight |
|---|---|---|---|---|---|---|---|
| January | 30° warm | 28° warm | 68% sticky | 11mm dry | 27% clear | 82 moderate | 11.1h shortish |
| February | 32° warm | 31° warm | 56% comfy | 9mm dry | 20% clear | 88 moderate | 11.5h shortish |
| March | 36° hot | 34° hot | 51% comfy | 13mm dry | 24% clear | 101 poor | 12h even |
| April | 39° scorching | 36° hot | 55% comfy | 37mm dryish | 37% bright | 97 moderate | 12.6h even |
| May | 38° scorching | 33° hot | 72% sticky | 135mm rainy | 70% grey | 71 moderate | 13h even |
| June | 36° hot | 31° warm | 80% sweaty | 145mm rainy | 91% overcast | 55 moderate | 13.2h even |
| July | 35° hot | 30° warm | 84% sweaty | 221mm soaking | 92% overcast | 49 clean | 13.1h even |
| August | 35° hot | 29° warm | 86% soupy | 276mm soaking | 93% overcast | 54 moderate | 12.8h even |
| September | 35° hot | 29° warm | 87% soupy | 269mm soaking | 85% overcast | 61 moderate | 12.2h even |
| October | 34° hot | 29° warm | 84% sweaty | 132mm rainy | 62% mixed | 72 moderate | 11.7h shortish |
| November | 32° warm | 28° warm | 78% sweaty | 32mm dryish | 41% bright | 81 moderate | 11.3h shortish |
| December | 29° warm | 27° mild | 73% sticky | 12mm dry | 33% clear | 83 moderate | 11h shortish |
Chiang Mai weather questions
- What is the best time to visit Chiang Mai?
- January scores best across temperature, rain, humidity and air quality — 30° feels-like, 11mm of rain and 68% humidity. May is the month to avoid: 135mm of rain and 71 AQI.
- How hot does Chiang Mai get?
- April is the peak, at 39° feels-like (36° in the shade) — scorching. Even in January it reaches 30°.
- When is the rainy season in Chiang Mai?
- August is the wettest month at 276mm, and February the driest at just 9mm.
- Is air quality a problem in Chiang Mai?
- March is the worst month at 101 AQI (poor), and July the best at 49 (clean).
Weather normals from Open-Meteo (ERA5 reanalysis, 1995–2024) and CAMS air quality (2015–2024), licensed CC-BY-4.0. Contains modified Copernicus Climate Change Service information. These are long-run averages, not forecasts — any given year will differ.
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