Climate averages 1991–2020
Chiang Rai weather
by month.
See how the year changes. April has the highest average daily maximum; February has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: JanuaryNovemberDecember
Long-term climate patterns, not a forecast for a particular trip.
Across the year Chiang Rai averages a daytime high of 29.5°C and a nighttime low of 20.4°C, with about 2,092 mm of rain on roughly 182 days. April is the warmest month (average high 33.6°C) and December the coolest (25.5°C). July is the wettest month with 398 mm; February is the driest with 14 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): January, November and December. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Chiang Rai
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 | 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
Nearby cities
- Chiang MaiThailand · 153 kmHigh 30.5°C · Low 21.3°C · 1,049 mm rain a year
- LampangThailand · 183 kmHigh 30.7°C · Low 22.0°C · 1,328 mm rain a year
- Kēng TungMyanmar · 192 kmHigh 28.0°C · Low 18.5°C · 1,353 mm rain a year
- Möng YangMyanmar · 216 kmHigh 26.9°C · Low 16.9°C · 1,367 mm rain a year
- YunjinghongChina · 255 kmHigh 28.8°C · Low 18.7°C · 1,700 mm rain a year
- MenglangChina · 295 kmHigh 25.9°C · Low 17.0°C · 1,326 mm rain a year
- TaunggyiMyanmar · 307 kmHigh 23.9°C · Low 14.7°C · 956 mm rain a year
- YawnghweMyanmar · 314 kmHigh 27.0°C · Low 18.1°C · 956 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC+7, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 19.90°, 99.80° (4 km from the city centre), adjusted up by 0.3°C for the difference between the city's elevation (401 m) and the cell's (448 m). Rain comes from the 0.25° cell at 20.00°, 99.75°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.