Climate averages 1991–2020
Chiang Rai weather
in May.
A hot, very wet month: the 3rd warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Chiang Rai: daytime highs average 31.5°C and nights cool to about 23.4°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 292 mm of rain on roughly 23 days, which makes May a very wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 04 min on an average May day.
The nearest other city in this atlas is Chiang Mai (153 km away). In May its highs average 33.1°C, 1.6°C warmer than Chiang Rai, with 99 mm of rain.
Among the 46 cities listed in Thailand, Chiang Rai ranks joint 38th of 46 for the warmest May highs and 45th of 46 for the driest May (rainfall, lowest first). The mean May high of those 46 cities is 32.7°C; Chiang Rai is 1.2°C cooler than that mean.
From May to June, average highs fall by 1.1°C to 30.4°C, and monthly rainfall rises from 292 mm to 297 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 Rai climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.6°C15.0°C | 15.0°C | 22 | 3.0 | 11.111 h |
| February | 30.0°C16.2°C | 16.2°C | 14 | 2.5 | 11.511 h |
| March | 33.0°C19.3°C | 19.3°C | 42 | 5.1 | 12.012 h |
| April | 33.6°C22.4°C | 22.4°C | 132 | 11.8 | 12.613 h |
| May, selected | 31.5°C23.4°C | 23.4°C | 292 | 22.8 | 13.113 h |
| June | 30.4°C23.7°C | 23.7°C | 297 | 26.2 | 13.313 h |
| July | 29.5°C23.4°C | 23.4°C | 398 | 28.4 | 13.213 h |
| August | 29.2°C23.2°C | 23.2°C | 383 | 28.8 | 12.813 h |
| September | 29.0°C22.9°C | 22.9°C | 295 | 25.1 | 12.312 h |
| October | 28.4°C21.6°C | 21.6°C | 139 | 17.8 | 11.712 h |
| November | 27.2°C18.4°C | 18.4°C | 49 | 6.6 | 11.211 h |
| December | 25.5°C15.4°C | 15.4°C | 27 | 3.7 | 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
- Chiang Mai in MayThailand · 153 kmHigh 33.1°C · Low 24.6°C · 99 mm rain
- Lampang in MayThailand · 183 kmHigh 32.8°C · Low 24.6°C · 168 mm rain
- Kēng Tung in MayMyanmar · 192 kmHigh 31.0°C · Low 21.5°C · 125 mm rain
- Möng Yang in MayMyanmar · 216 kmHigh 30.0°C · Low 20.0°C · 139 mm rain
- Yunjinghong in MayChina · 255 kmHigh 32.0°C · Low 22.0°C · 207 mm rain
- Menglang in MayChina · 295 kmHigh 29.2°C · Low 19.7°C · 142 mm rain
- Taunggyi in MayMyanmar · 307 kmHigh 26.4°C · Low 17.5°C · 126 mm rain
- Yawnghwe in MayMyanmar · 314 kmHigh 29.3°C · Low 20.7°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 Rai) is explained once on the Chiang Rai year overview and on the Sources, method and limits page.