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Chiang Rai, Thailand climate
Aw Tropical savanna (dry winter)
Chiang Rai has a mildly seasonal tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is May with an average daily high near 34°C, while the coldest is December averaging around 14°C at night. Precipitation totals about 1693 mm a year and is strongly seasonal — August alone averages 368 mm while January barely receives 7 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Chiang Rai climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 31 | 34 | 35 | 34 | 33 | 31 | 31 | 31 | 31 | 30 | 28 |
| Avg temp (°C) | 21 | 23 | 26 | 28 | 28 | 28 | 28 | 27 | 27 | 26 | 24 | 21 |
| Avg low (°C) | 13 | 14 | 17 | 21 | 23 | 24 | 24 | 24 | 23 | 21 | 18 | 14 |
| Precipitation (mm) | 7 | 15 | 37 | 81 | 236 | 193 | 307 | 368 | 276 | 97 | 58 | 17 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 31 | 34 | 35 | 34 | 33 |
| Avg temp (°C) | 21 | 23 | 26 | 28 | 28 | 28 |
| Avg low (°C) | 13 | 14 | 17 | 21 | 23 | 24 |
| Precipitation (mm) | 7 | 15 | 37 | 81 | 236 | 193 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 31 | 31 | 31 | 30 | 28 |
| Avg temp (°C) | 28 | 27 | 27 | 26 | 24 | 21 |
| Avg low (°C) | 24 | 24 | 23 | 21 | 18 | 14 |
| Precipitation (mm) | 307 | 368 | 276 | 97 | 58 | 17 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 2 | 2 | 4 | 10 | 17 | 18 | 21 | 23 | 17 | 11 | 5 | 3 |
| Days with high ≥ 32°C (days) | 0.9 | 13 | 24 | 24 | 22 | 18 | 12 | 10 | 12 | 9 | 3 | 0.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 2 | 2 | 4 | 10 | 17 | 18 |
| Days with high ≥ 32°C (days) | 0.9 | 13 | 24 | 24 | 22 | 18 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 21 | 23 | 17 | 11 | 5 | 3 |
| Days with high ≥ 32°C (days) | 12 | 10 | 12 | 9 | 3 | 0.6 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 26 | 21 | 31 | 48 | 75 | 89 | 92 | 92 | 82 | 63 | 40 | 33 |
| Relative humidity (%) | 70 | 60 | 55 | 60 | 72 | 79 | 83 | 85 | 83 | 81 | 79 | 76 |
| Wind speed (mph) | 1.6 | 1.7 | 1.9 | 1.9 | 1.9 | 2.0 | 1.9 | 1.7 | 1.5 | 1.5 | 1.5 | 1.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 26 | 21 | 31 | 48 | 75 | 89 |
| Relative humidity (%) | 70 | 60 | 55 | 60 | 72 | 79 |
| Wind speed (mph) | 1.6 | 1.7 | 1.9 | 1.9 | 1.9 | 2.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 92 | 92 | 82 | 63 | 40 | 33 |
| Relative humidity (%) | 83 | 85 | 83 | 81 | 79 | 76 |
| Wind speed (mph) | 1.9 | 1.7 | 1.5 | 1.5 | 1.5 | 1.5 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Chiang Rai, a weather station, about 3 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.