Climate averages 1991–2020
Chiang Mai weather
in May.
A hot, wet month: the 3rd warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Chiang Mai: daytime highs average 33.1°C and nights cool to about 24.6°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 99 mm of rain on roughly 13 days, which makes May a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 00 min on an average May day.
The nearest other city in this atlas is Lampang (77 km away). In May its highs average 32.8°C, about as warm as Chiang Mai, with 168 mm of rain.
Among the 46 cities listed in Thailand, Chiang Mai ranks joint 17th of 46 for the warmest May highs and 2nd of 46 for the driest May (rainfall, lowest first). The mean May high of those 46 cities is 32.7°C; Chiang Mai is 0.4°C warmer than that mean.
From May to June, average highs fall by 2.2°C to 30.9°C, and monthly rainfall rises from 99 mm to 120 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Chiang Mai climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.1°C16.2°C | 16.2°C | 6.7 | 1.3 | 11.111 h |
| February | 31.3°C18.4°C | 18.4°C | 3.3 | 0.7 | 11.512 h |
| March | 34.3°C21.7°C | 21.7°C | 12 | 2.1 | 12.012 h |
| April | 35.8°C24.5°C | 24.5°C | 26 | 4.3 | 12.613 h |
| May, selected | 33.1°C24.6°C | 24.6°C | 99 | 13.1 | 13.013 h |
| June | 30.9°C24.1°C | 24.1°C | 120 | 18.3 | 13.213 h |
| July | 29.9°C23.8°C | 23.8°C | 175 | 21.9 | 13.113 h |
| August | 29.1°C23.4°C | 23.4°C | 236 | 25.0 | 12.813 h |
| September | 29.3°C22.9°C | 22.9°C | 227 | 23.4 | 12.312 h |
| October | 28.9°C21.5°C | 21.5°C | 114 | 15.7 | 11.712 h |
| November | 28.3°C18.8°C | 18.8°C | 21 | 4.0 | 11.311 h |
| December | 27.1°C16.0°C | 16.0°C | 9.1 | 1.2 | 11.011 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Lampang in MayThailand · 77 kmHigh 32.8°C · Low 24.6°C · 168 mm rain
- Chiang Rai in MayThailand · 153 kmHigh 31.5°C · Low 23.4°C · 292 mm rain
- Nyaunglebin in MayMyanmar · 256 kmHigh 33.0°C · Low 25.2°C · 208 mm rain
- Taungoo in MayMyanmar · 269 kmHigh 33.2°C · Low 25.0°C · 198 mm rain
- Thaton in MayMyanmar · 269 kmHigh 31.1°C · Low 25.2°C · 428 mm rain
- Mawlamyine in MayMyanmar · 293 kmHigh 30.5°C · Low 25.2°C · 374 mm rain
- Yawnghwe in MayMyanmar · 299 kmHigh 29.3°C · Low 20.7°C · 126 mm rain
- Taunggyi in MayMyanmar · 301 kmHigh 26.4°C · Low 17.5°C · 126 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Chiang Mai) is explained once on the Chiang Mai year overview and on the Sources, method and limits page.