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.

☀️ All year

Hot

Daytime highs near 34°C most of the year.

About 149 days a year above 32 °C

🌙 Nights

Stays warm

Even the coolest nights stay near 14°C.

🌧️ Rain

Very wet

About 1693 mm of rain a year.

Wettest in August

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.7 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours 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 (m/s)	0.7	0.8	0.9	0.9	0.9	0.9	0.8	0.7	0.7	0.7	0.7	0.7

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 (m/s)	0.7	0.8	0.9	0.9	0.9	0.9

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 (m/s)	0.8	0.7	0.7	0.7	0.7	0.7

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.

How we build these numbers →