Chiang Rai climate — normals and trends

Q: What is the climate of Chiang Rai?

Chiang Rai has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 23.8 °C and it receives 2,123 mm of precipitation per year.

Q: What is the hottest day ever recorded in Chiang Rai?

The hottest day measured in Chiang Rai between 1940 and 2025 was 1 May 2024, reaching 41.8 °C.

Q: What is the coldest day in Chiang Rai?

The coldest day measured in Chiang Rai between 1940 and 2025 was 6 January 1974, at 3.9 °C.

Q: Does it snow in Chiang Rai?

Almost never: Chiang Rai sees virtually no snow, with about 0 frost days per year.

Q: Has the climate of Chiang Rai warmed?

Yes: Chiang Rai warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Chiang Rai?

The wettest day measured in Chiang Rai between 1940 and 2025 was 1 September 1995, with 145 mm of rain in 24 hours.

Q: What was the windiest day in Chiang Rai?

The windiest day measured in Chiang Rai between 1940 and 2025 was 9 November 1990, with winds reaching 22.7 km/h.

Q: What is the warmest month in Chiang Rai?

The warmest month in Chiang Rai is April (26.5 °C on average); the coldest is December (19.1 °C).

Q: How much does it rain in Chiang Rai?

Chiang Rai receives on average 2,123 mm of precipitation per year, spread over about 187 rainy days.

Q: Is it sunny in Chiang Rai?

Chiang Rai gets on average 9.5 hours of sunshine per day, roughly 3,468 hours per year over 1940-2025.

Chiang Rai (Thailand) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 23.8 °C and it receives 2,123 mm of precipitation per year.

These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.

The warmest month is April (26.5 °C on average) and the coldest is December (19.1 °C). Rainfall peaks in August.

Chiang Rai averages 0 frost days, 169 hot days (≥ 30 °C) and 187 rainy days per year.

Chiang Rai has warmed by +2.0 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.

The hottest day of the period reached 41.8 °C (on 1 May 2024) and the coldest 3.9 °C (on 6 January 1974).

Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.

Climate normals · ERA5

Chiang RaiChiang Rai

coords: 19.91°, 99.83°
period: 1940–2025 · 86 yrs

AmTropical monsoonWarmest monthAprilColdest monthDecemberWettest monthAugustDriest monthFebruary

Mean daily temperature

23.8°C

Average daily high

29.7°C

Average daily low

19.4°C

Annual rainfall

2,123mm

Sunshine / day

9.5h

Mean relative humidity

77%

Average peak wind

7.8km/h

Seasonal range

7.4°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

169 d/yr

Rainy days (≥ 1 mm)

187 d/yr

Annual snowfall

0.0 cm

Average feels-like high

33.2 °C

Average feels-like low

22.0 °C

Average peak gust

26.1 km/h

Tropical nights (≥ 20 °C)

206 d/yr

Solar radiation

17.5 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.0 °C

since 1940

+0.2 °C per decade · r² = 0.77 · p = < 0.001

19402025

Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).

A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.

Records for the period

Hottest day

41.8 °C

1 May 2024

Coldest day

3.9 °C

6 January 1974

Wettest day

145 mm

1 September 1995

Windiest day

22.7 km/h

9 November 1990

Strongest gust

69.1 km/h

9 November 1990

Hottest feels-like

45.4 °C

11 May 2016

Coldest feels-like

1.3 °C

6 January 1974

Sunniest day

13.0 h

26 June 1941

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	38.4 °C25 April 2025	8.9 °C29 November 2025	24.7 °C	1,982 mm	212
2024	41.8 °C1 May 2024	11.6 °C5 February 2024	25.4 °C	2,358 mm	246
2023	40.8 °C18 April 2023	10.3 °C16 January 2023	25.4 °C	1,695 mm	251
2022	36.8 °C5 March 2022	10.2 °C1 February 2022	24.8 °C	1,912 mm	225
2021	38.6 °C21 March 2021	10.3 °C14 January 2021	24.8 °C	1,722 mm	222
2020	40.3 °C21 April 2020	7.4 °C27 January 2020	25.1 °C	1,613 mm	260
2019	41.0 °C8 May 2019	7.1 °C9 December 2019	25.3 °C	1,229 mm	268
2018	36.1 °C13 April 2018	11.0 °C25 January 2018	24.3 °C	2,512 mm	194
2017	39.0 °C10 April 2017	7.6 °C21 December 2017	24.8 °C	2,285 mm	210
2016	40.5 °C27 April 2016	6.7 °C26 January 2016	24.9 °C	1,834 mm	233
2015	37.9 °C21 March 2015	9.8 °C15 February 2015	24.7 °C	2,174 mm	242
2014	37.6 °C19 March 2014	6.3 °C23 January 2014	24.6 °C	1,750 mm	235
2013	37.5 °C20 April 2013	8.0 °C18 December 2013	24.4 °C	2,277 mm	214
2012	38.0 °C26 April 2012	9.4 °C28 January 2012	24.7 °C	2,093 mm	231
2011	36.5 °C6 March 2011	10.9 °C9 February 2011	24.2 °C	2,313 mm	169
2010	39.2 °C11 April 2010	10.7 °C9 February 2010	25.2 °C	1,807 mm	240
2009	37.6 °C24 April 2009	9.5 °C16 January 2009	24.5 °C	1,862 mm	232
2008	37.2 °C9 April 2008	8.5 °C2 December 2008	24.2 °C	2,581 mm	176
2007	38.9 °C31 March 2007	9.7 °C22 January 2007	24.2 °C	2,023 mm	200
2006	38.5 °C12 April 2006	8.7 °C23 December 2006	24.4 °C	2,083 mm	207
2005	36.3 °C12 March 2005	10.9 °C20 December 2005	24.4 °C	2,313 mm	221
2004	37.3 °C30 March 2004	9.8 °C21 January 2004	24.0 °C	2,239 mm	189
2003	37.2 °C7 May 2003	11.8 °C25 January 2003	24.2 °C	1,548 mm	202
2002	37.5 °C21 April 2002	10.9 °C22 December 2002	24.0 °C	2,482 mm	186
2001	38.8 °C24 April 2001	9.4 °C29 November 2001	24.3 °C	2,161 mm	192
2000	35.7 °C3 April 2000	9.8 °C14 January 2000	23.7 °C	2,482 mm	153
1999	36.0 °C12 March 1999	4.2 °C26 December 1999	23.9 °C	2,430 mm	152
1998	38.8 °C14 April 1998	8.7 °C13 January 1998	24.8 °C	1,725 mm	232
1997	37.0 °C22 March 1997	8.4 °C10 February 1997	24.2 °C	1,871 mm	204
1996	37.7 °C31 March 1996	7.9 °C2 January 1996	24.0 °C	2,366 mm	163
1995	38.7 °C22 April 1995	8.8 °C30 December 1995	24.3 °C	2,513 mm	185
1994	37.9 °C10 April 1994	11.1 °C1 January 1994	24.2 °C	2,548 mm	190
1993	36.8 °C1 April 1993	6.6 °C29 December 1993	23.8 °C	1,863 mm	179
1992	40.4 °C9 May 1992	8.6 °C6 January 1992	23.8 °C	1,808 mm	188
1991	38.7 °C18 April 1991	9.9 °C25 January 1991	24.1 °C	1,973 mm	190
1990	40.5 °C23 April 1990	8.1 °C10 January 1990	24.0 °C	2,293 mm	178
1989	39.2 °C21 April 1989	8.3 °C11 January 1989	24.1 °C	1,897 mm	174
1988	37.9 °C12 April 1988	10.6 °C23 January 1988	23.9 °C	2,439 mm	174
1987	37.2 °C24 April 1987	8.9 °C24 December 1987	23.9 °C	2,155 mm	190
1986	37.1 °C30 March 1986	8.8 °C8 January 1986	23.6 °C	2,262 mm	172
1985	37.8 °C14 April 1985	7.7 °C25 December 1985	23.8 °C	2,175 mm	156
1984	38.8 °C4 April 1984	8.7 °C23 January 1984	23.8 °C	2,341 mm	168
1983	39.9 °C18 April 1983	7.9 °C2 December 1983	24.3 °C	1,987 mm	198
1982	36.7 °C24 March 1982	7.6 °C28 December 1982	23.7 °C	2,335 mm	150
1981	38.3 °C7 April 1981	10.9 °C18 January 1981	23.9 °C	2,580 mm	176
1980	39.3 °C30 April 1980	8.2 °C29 January 1980	24.1 °C	2,115 mm	172
1979	37.4 °C6 May 1979	9.8 °C24 December 1979	24.1 °C	2,087 mm	184
1978	37.0 °C7 April 1978	7.8 °C18 December 1978	23.5 °C	2,422 mm	149
1977	36.2 °C18 March 1977	10.4 °C3 February 1977	23.2 °C	2,284 mm	149
1976	37.0 °C15 April 1976	5.4 °C1 January 1976	23.2 °C	2,336 mm	155
1975	39.1 °C29 April 1975	4.9 °C31 December 1975	23.5 °C	2,434 mm	163
1974	36.0 °C16 March 1974	3.9 °C6 January 1974	23.1 °C	2,322 mm	140
1973	37.8 °C15 April 1973	5.7 °C27 December 1973	23.5 °C	2,741 mm	168
1972	36.5 °C13 May 1972	8.9 °C22 January 1972	23.5 °C	2,380 mm	175
1971	35.4 °C1 April 1971	6.4 °C6 January 1971	22.7 °C	2,282 mm	133
1970	38.0 °C20 April 1970	10.6 °C21 December 1970	23.6 °C	2,655 mm	150
1969	39.5 °C23 April 1969	9.0 °C28 January 1969	23.8 °C	2,066 mm	187
1968	36.2 °C27 May 1968	9.6 °C6 February 1968	23.2 °C	2,161 mm	142
1967	36.5 °C4 April 1967	9.0 °C17 January 1967	23.4 °C	2,257 mm	132
1966	39.4 °C1 May 1966	10.4 °C3 January 1966	23.9 °C	2,044 mm	102
1965	39.1 °C30 April 1965	8.8 °C20 January 1965	23.3 °C	2,358 mm	133
1964	37.3 °C11 April 1964	8.5 °C20 December 1964	23.3 °C	2,158 mm	146
1963	38.1 °C23 April 1963	7.5 °C28 January 1963	23.3 °C	2,149 mm	162
1962	37.1 °C13 April 1962	8.7 °C7 December 1962	23.4 °C	1,800 mm	154
1961	37.4 °C26 March 1961	8.2 °C18 January 1961	23.5 °C	2,283 mm	124
1960	41.3 °C28 April 1960	9.7 °C3 January 1960	23.9 °C	1,962 mm	148
1959	41.1 °C11 April 1959	8.8 °C2 January 1959	23.7 °C	2,035 mm	154
1958	38.2 °C26 April 1958	8.6 °C18 December 1958	23.6 °C	1,801 mm	167
1957	39.7 °C13 May 1957	8.8 °C5 February 1957	23.8 °C	1,957 mm	166
1956	38.9 °C10 April 1956	8.2 °C4 January 1956	23.6 °C	2,053 mm	153
1955	36.2 °C21 March 1955	6.2 °C4 December 1955	22.9 °C	2,065 mm	140
1954	38.0 °C19 April 1954	7.2 °C17 December 1954	23.6 °C	1,732 mm	152
1953	34.4 °C15 April 1953	9.7 °C27 January 1953	22.5 °C	2,238 mm	88
1952	37.5 °C3 May 1952	9.6 °C20 December 1952	23.2 °C	2,274 mm	112
1951	39.0 °C9 April 1951	9.5 °C18 December 1951	23.2 °C	2,177 mm	119
1950	39.6 °C23 April 1950	9.6 °C18 January 1950	23.5 °C	2,030 mm	116
1949	33.7 °C12 April 1949	8.1 °C3 January 1949	23.0 °C	1,716 mm	83
1948	36.6 °C13 March 1948	9.6 °C4 January 1948	23.0 °C	2,199 mm	89
1947	36.6 °C7 May 1947	10.2 °C31 December 1947	23.3 °C	1,622 mm	91
1946	37.5 °C12 March 1946	9.4 °C8 January 1946	23.3 °C	1,490 mm	107
1945	36.8 °C3 April 1945	10.5 °C24 December 1945	23.0 °C	2,194 mm	71
1944	37.3 °C4 May 1944	9.5 °C22 December 1944	23.2 °C	2,109 mm	108
1943	37.3 °C7 April 1943	10.3 °C6 February 1943	23.1 °C	1,894 mm	112
1942	38.3 °C17 April 1942	9.8 °C16 December 1942	22.6 °C	2,393 mm	88
1941	37.2 °C6 April 1941	11.5 °C30 January 1941	22.9 °C	2,183 mm	88
1940	36.2 °C11 April 1940	7.9 °C1 January 1940	22.8 °C	2,212 mm	95

Normals computed over complete calendar years 1940–2025.

A specific year

Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?

Year

Across the whole year

Average daily high

30.6 °C

+0.9 °C

Hot days (≥ 30 °C)

212 d/yr

+43

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1982 mm

-141 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	27.0 °C	0.0 °C	0 mm	-22 mm
Feb	31.4 °C	+1.2 °C	7 mm	-11 mm
Mar	34.0 °C	+1.2 °C	8 mm	-40 mm
Apr	34.2 °C	+0.8 °C	57 mm	-69 mm
May	31.7 °C	+0.3 °C	322 mm	+17 mm
Jun	31.6 °C	+1.0 °C	268 mm	-49 mm
Jul	30.0 °C	0.0 °C	467 mm	+112 mm
Aug	31.0 °C	+1.3 °C	437 mm	+51 mm
Sep	30.9 °C	+1.4 °C	213 mm	-99 mm
Oct	30.7 °C	+1.9 °C	101 mm	-54 mm
Nov	26.9 °C	-0.4 °C	100 mm	+44 mm
Dec	27.4 °C	+1.7 °C	3 mm	-22 mm

The year's extremes

Hottest day

38.4 °C

25 Apr 2025

Coldest day

8.9 °C

29 Nov 2025

Wettest day

61.3 mm

28 Aug 2025

Windiest day

17.1 km/h

27 Jan 2025

Strongest gust

50.0 km/h

26 Jan 2025

Hottest feels-like

42.5 °C

10 May 2025

Coldest feels-like

7.5 °C

29 Nov 2025

Sunniest day

13.0 h

18 Jul 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Chiang Rai?

Chiang Rai has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 23.8 °C and it receives 2,123 mm of precipitation per year.

What is the hottest day ever recorded in Chiang Rai?

The hottest day measured in Chiang Rai between 1940 and 2025 was 1 May 2024, reaching 41.8 °C.

What is the coldest day in Chiang Rai?

The coldest day measured in Chiang Rai between 1940 and 2025 was 6 January 1974, at 3.9 °C.

Does it snow in Chiang Rai?

Almost never: Chiang Rai sees virtually no snow, with about 0 frost days per year.

Has the climate of Chiang Rai warmed?

Yes: Chiang Rai warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Chiang Rai?

The wettest day measured in Chiang Rai between 1940 and 2025 was 1 September 1995, with 145 mm of rain in 24 hours.

What was the windiest day in Chiang Rai?

The windiest day measured in Chiang Rai between 1940 and 2025 was 9 November 1990, with winds reaching 22.7 km/h.

What is the warmest month in Chiang Rai?

The warmest month in Chiang Rai is April (26.5 °C on average); the coldest is December (19.1 °C).

How much does it rain in Chiang Rai?

Chiang Rai receives on average 2,123 mm of precipitation per year, spread over about 187 rainy days.

Is it sunny in Chiang Rai?

Chiang Rai gets on average 9.5 hours of sunshine per day, roughly 3,468 hours per year over 1940-2025.

Are there tropical nights in Chiang Rai?

Yes: Chiang Rai has on average 206 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Chiang Rai?

In Chiang Rai, between 1940 and 2025, the highest apparent temperature reached 45.4 °C on 11 May 2016, and the lowest was 1.3 °C on 6 January 1974.

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