Mae Sai climate — normals and trends

Q: What is the climate of Mae Sai?

Mae Sai has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 23.8 °C and it receives 2,223 mm of precipitation per year.

Q: What is the hottest day ever recorded in Mae Sai?

The hottest day measured in Mae Sai between 1940 and 2025 was 29 April 1960, reaching 41.8 °C.

Q: What is the coldest day in Mae Sai?

The coldest day measured in Mae Sai between 1940 and 2025 was 27 December 1999, at 3.3 °C.

Q: Does it snow in Mae Sai?

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

Q: Has the climate of Mae Sai warmed?

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

Q: What is the wettest day in Mae Sai?

The wettest day measured in Mae Sai between 1940 and 2025 was 12 September 1970, with 186 mm of rain in 24 hours.

Q: What was the windiest day in Mae Sai?

The windiest day measured in Mae Sai between 1940 and 2025 was 9 November 1990, with winds reaching 21.4 km/h.

Q: What is the warmest month in Mae Sai?

The warmest month in Mae Sai is May (26.6 °C on average); the coldest is January (18.8 °C).

Q: How much does it rain in Mae Sai?

Mae Sai receives on average 2,223 mm of precipitation per year, spread over about 185 rainy days.

Q: Is it sunny in Mae Sai?

Mae Sai gets on average 9.3 hours of sunshine per day, roughly 3,395 hours per year over 1940-2025.

Mae Sai (Thailand) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 23.8 °C and it receives 2,223 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 May (26.6 °C on average) and the coldest is January (18.8 °C). Rainfall peaks in August.

Mae Sai averages 0 frost days, 174 hot days (≥ 30 °C) and 185 rainy days per year.

Mae Sai has warmed by +2.0 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.

The hottest day of the period reached 41.8 °C (on 29 April 1960) and the coldest 3.3 °C (on 27 December 1999).

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

Mae SaiChiang Rai

coords: 20.43°, 99.88°
period: 1940–2025 · 86 yrs

AmTropical monsoonWarmest monthMayColdest monthJanuaryWettest monthAugustDriest monthFebruary

Mean daily temperature

23.8°C

Average daily high

29.8°C

Average daily low

19.3°C

Annual rainfall

2,223mm

Sunshine / day

9.3h

Mean relative humidity

79%

Average peak wind

6.9km/h

Seasonal range

7.8°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

174 d/yr

Rainy days (≥ 1 mm)

185 d/yr

Annual snowfall

0.0 cm

Average feels-like high

33.4 °C

Average feels-like low

22.2 °C

Average peak gust

25.6 km/h

Tropical nights (≥ 20 °C)

205 d/yr

Solar radiation

17.0 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.0 °C

since 1940

+0.2 °C per decade · r² = 0.80 · 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

29 April 1960

Coldest day

3.3 °C

27 December 1999

Wettest day

186 mm

12 September 1970

Windiest day

21.4 km/h

9 November 1990

Strongest gust

65.9 km/h

24 August 1987

Hottest feels-like

45.3 °C

11 May 2016

Coldest feels-like

0.9 °C

27 December 1999

Sunniest day

13.0 h

13 June 1943

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	38.8 °C25 April 2025	8.2 °C29 November 2025	24.7 °C	2,242 mm	218
2024	41.3 °C1 May 2024	10.9 °C5 February 2024	25.4 °C	2,518 mm	245
2023	41.0 °C18 April 2023	9.7 °C16 January 2023	25.4 °C	1,635 mm	258
2022	37.1 °C28 April 2022	9.9 °C10 February 2022	25.0 °C	1,914 mm	246
2021	37.7 °C21 March 2021	10.4 °C14 January 2021	24.8 °C	1,817 mm	234
2020	39.3 °C21 April 2020	7.9 °C29 January 2020	25.1 °C	1,852 mm	273
2019	41.5 °C8 May 2019	6.3 °C9 December 2019	25.3 °C	1,340 mm	278
2018	37.5 °C13 April 2018	10.4 °C25 January 2018	24.3 °C	2,571 mm	216
2017	38.9 °C10 April 2017	6.3 °C21 December 2017	24.7 °C	2,308 mm	220
2016	40.6 °C11 May 2016	7.6 °C26 January 2016	24.8 °C	2,053 mm	232
2015	38.0 °C7 May 2015	9.7 °C13 January 2015	24.7 °C	2,102 mm	232
2014	38.7 °C24 April 2014	6.7 °C23 January 2014	24.7 °C	1,886 mm	240
2013	37.8 °C20 April 2013	7.3 °C18 December 2013	24.5 °C	2,307 mm	220
2012	39.3 °C26 April 2012	9.0 °C26 January 2012	24.8 °C	2,188 mm	243
2011	36.6 °C6 March 2011	10.6 °C10 February 2011	24.2 °C	2,162 mm	172
2010	39.8 °C11 April 2010	9.5 °C9 February 2010	25.1 °C	1,989 mm	232
2009	37.3 °C25 April 2009	9.4 °C16 January 2009	24.5 °C	2,001 mm	218
2008	37.1 °C9 April 2008	7.4 °C2 December 2008	24.1 °C	2,520 mm	173
2007	39.1 °C31 March 2007	9.1 °C22 February 2007	24.2 °C	2,131 mm	208
2006	38.3 °C11 April 2006	8.3 °C23 December 2006	24.4 °C	2,222 mm	210
2005	36.5 °C19 May 2005	10.3 °C20 December 2005	24.4 °C	2,353 mm	217
2004	36.7 °C24 March 2004	9.8 °C21 January 2004	23.9 °C	2,400 mm	192
2003	38.0 °C7 May 2003	11.6 °C24 February 2003	24.3 °C	1,896 mm	215
2002	37.0 °C6 April 2002	10.1 °C20 January 2002	24.0 °C	2,550 mm	186
2001	38.1 °C20 April 2001	8.9 °C27 January 2001	24.3 °C	2,305 mm	193
2000	35.9 °C3 April 2000	9.4 °C14 January 2000	23.8 °C	2,505 mm	150
1999	37.0 °C26 April 1999	3.3 °C27 December 1999	24.0 °C	2,444 mm	159
1998	38.4 °C13 April 1998	8.9 °C15 February 1998	24.9 °C	2,173 mm	227
1997	36.8 °C23 May 1997	7.5 °C10 February 1997	24.1 °C	2,086 mm	192
1996	37.6 °C10 April 1996	7.5 °C2 January 1996	23.9 °C	2,416 mm	174
1995	38.6 °C22 April 1995	8.3 °C30 December 1995	24.3 °C	2,429 mm	189
1994	39.0 °C10 April 1994	10.7 °C1 January 1994	24.2 °C	2,720 mm	177
1993	36.8 °C1 April 1993	6.0 °C29 December 1993	23.8 °C	1,961 mm	180
1992	40.3 °C9 May 1992	7.8 °C6 January 1992	23.8 °C	1,884 mm	190
1991	38.4 °C18 April 1991	8.9 °C16 February 1991	24.1 °C	2,056 mm	190
1990	40.3 °C23 April 1990	7.8 °C10 January 1990	24.0 °C	2,414 mm	173
1989	39.6 °C21 April 1989	7.6 °C9 January 1989	24.0 °C	2,159 mm	181
1988	38.2 °C7 April 1988	10.3 °C20 December 1988	24.0 °C	2,501 mm	177
1987	38.0 °C24 April 1987	9.1 °C25 December 1987	24.0 °C	2,092 mm	189
1986	37.5 °C31 March 1986	8.3 °C8 January 1986	23.7 °C	2,202 mm	181
1985	37.7 °C14 April 1985	7.7 °C25 December 1985	23.9 °C	2,451 mm	168
1984	38.9 °C5 April 1984	8.2 °C22 January 1984	23.9 °C	2,371 mm	176
1983	39.9 °C18 April 1983	7.5 °C1 December 1983	24.2 °C	2,224 mm	204
1982	37.1 °C24 March 1982	7.1 °C29 December 1982	23.6 °C	2,409 mm	158
1981	38.6 °C6 April 1981	10.0 °C16 February 1981	23.8 °C	2,715 mm	181
1980	39.8 °C15 May 1980	7.8 °C29 January 1980	24.1 °C	2,401 mm	179
1979	38.0 °C13 April 1979	9.2 °C24 December 1979	24.0 °C	2,177 mm	189
1978	37.0 °C3 April 1978	7.8 °C18 December 1978	23.5 °C	2,807 mm	157
1977	37.8 °C17 April 1977	9.7 °C3 February 1977	23.2 °C	2,329 mm	150
1976	37.5 °C15 April 1976	5.5 °C1 January 1976	23.2 °C	2,422 mm	157
1975	39.0 °C29 April 1975	4.4 °C31 December 1975	23.5 °C	2,416 mm	170
1974	36.5 °C16 March 1974	3.8 °C5 January 1974	23.2 °C	2,601 mm	160
1973	37.3 °C15 April 1973	5.5 °C29 December 1973	23.5 °C	2,828 mm	172
1972	37.2 °C13 May 1972	8.5 °C22 January 1972	23.5 °C	2,500 mm	179
1971	36.3 °C1 April 1971	5.9 °C6 January 1971	22.8 °C	2,340 mm	144
1970	37.8 °C20 April 1970	9.6 °C15 January 1970	23.6 °C	2,751 mm	168
1969	40.6 °C26 April 1969	8.4 °C23 January 1969	23.8 °C	2,113 mm	197
1968	36.2 °C29 March 1968	8.9 °C8 February 1968	23.2 °C	2,385 mm	136
1967	37.3 °C4 April 1967	9.2 °C17 January 1967	23.4 °C	2,255 mm	137
1966	40.4 °C2 May 1966	10.9 °C31 December 1966	24.0 °C	2,067 mm	112
1965	38.7 °C30 April 1965	8.7 °C18 January 1965	23.2 °C	2,454 mm	146
1964	37.3 °C11 April 1964	8.1 °C29 December 1964	23.3 °C	2,204 mm	151
1963	38.1 °C25 April 1963	6.8 °C28 January 1963	23.3 °C	2,243 mm	155
1962	37.7 °C18 April 1962	8.3 °C29 December 1962	23.5 °C	1,811 mm	166
1961	37.3 °C26 March 1961	7.8 °C19 January 1961	23.5 °C	2,600 mm	132
1960	41.8 °C29 April 1960	9.7 °C4 January 1960	23.9 °C	2,218 mm	152
1959	40.6 °C11 April 1959	8.0 °C6 February 1959	23.7 °C	2,139 mm	162
1958	38.5 °C26 April 1958	7.4 °C18 December 1958	23.5 °C	1,904 mm	168
1957	39.5 °C23 May 1957	7.4 °C5 February 1957	23.7 °C	2,163 mm	174
1956	39.1 °C10 April 1956	7.0 °C4 January 1956	23.6 °C	1,994 mm	171
1955	36.9 °C21 March 1955	5.9 °C13 January 1955	22.9 °C	2,162 mm	150
1954	38.1 °C27 April 1954	7.3 °C17 December 1954	23.5 °C	1,783 mm	159
1953	34.9 °C15 April 1953	9.0 °C26 December 1953	22.6 °C	2,203 mm	110
1952	37.6 °C3 May 1952	8.9 °C20 December 1952	23.1 °C	2,376 mm	117
1951	38.8 °C9 April 1951	9.9 °C30 January 1951	23.1 °C	2,181 mm	118
1950	39.3 °C24 April 1950	8.8 °C7 January 1950	23.4 °C	2,257 mm	119
1949	34.5 °C12 April 1949	7.8 °C3 January 1949	23.1 °C	1,871 mm	108
1948	37.0 °C14 March 1948	7.6 °C4 January 1948	22.9 °C	2,321 mm	103
1947	37.6 °C7 May 1947	8.3 °C31 December 1947	23.3 °C	1,661 mm	103
1946	37.5 °C19 March 1946	7.7 °C12 January 1946	23.1 °C	1,404 mm	129
1945	36.8 °C3 April 1945	10.1 °C19 January 1945	22.9 °C	2,307 mm	81
1944	37.3 °C9 April 1944	10.0 °C5 February 1944	23.2 °C	2,223 mm	122
1943	38.4 °C7 April 1943	9.3 °C5 February 1943	23.1 °C	2,070 mm	124
1942	38.6 °C17 April 1942	9.7 °C13 December 1942	22.6 °C	2,338 mm	91
1941	36.7 °C24 March 1941	10.3 °C24 January 1941	22.8 °C	2,238 mm	100
1940	36.1 °C11 April 1940	6.9 °C1 January 1940	22.8 °C	2,199 mm	101

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

30.8 °C

+1.0 °C

Hot days (≥ 30 °C)

218 d/yr

+44

Frost days (< 0 °C)

0 d/yr

Annual rainfall

2242 mm

+19 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	26.9 °C	+0.2 °C	2 mm	-24 mm
Feb	31.2 °C	+1.3 °C	6 mm	-14 mm
Mar	33.7 °C	+1.1 °C	9 mm	-38 mm
Apr	34.3 °C	+0.8 °C	35 mm	-73 mm
May	32.1 °C	+0.3 °C	322 mm	+34 mm
Jun	32.1 °C	+1.4 °C	388 mm	+25 mm
Jul	30.0 °C	0.0 °C	546 mm	+132 mm
Aug	31.3 °C	+1.4 °C	437 mm	+13 mm
Sep	31.6 °C	+1.7 °C	265 mm	-44 mm
Oct	31.3 °C	+2.1 °C	122 mm	-22 mm
Nov	27.4 °C	-0.2 °C	107 mm	+54 mm
Dec	27.4 °C	+1.7 °C	3 mm	-25 mm

The year's extremes

Hottest day

38.8 °C

25 Apr 2025

Coldest day

8.2 °C

29 Nov 2025

Wettest day

96.0 mm

28 Aug 2025

Windiest day

17.1 km/h

26 Jan 2025

Strongest gust

50.0 km/h

31 Aug 2025

Hottest feels-like

42.7 °C

9 May 2025

Coldest feels-like

7.1 °C

29 Nov 2025

Sunniest day

13.0 h

12 Jun 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 Mae Sai?

Mae Sai has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 23.8 °C and it receives 2,223 mm of precipitation per year.

What is the hottest day ever recorded in Mae Sai?

The hottest day measured in Mae Sai between 1940 and 2025 was 29 April 1960, reaching 41.8 °C.

What is the coldest day in Mae Sai?

The coldest day measured in Mae Sai between 1940 and 2025 was 27 December 1999, at 3.3 °C.

Does it snow in Mae Sai?

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

Has the climate of Mae Sai warmed?

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

What is the wettest day in Mae Sai?

The wettest day measured in Mae Sai between 1940 and 2025 was 12 September 1970, with 186 mm of rain in 24 hours.

What was the windiest day in Mae Sai?

The windiest day measured in Mae Sai between 1940 and 2025 was 9 November 1990, with winds reaching 21.4 km/h.

What is the warmest month in Mae Sai?

The warmest month in Mae Sai is May (26.6 °C on average); the coldest is January (18.8 °C).

How much does it rain in Mae Sai?

Mae Sai receives on average 2,223 mm of precipitation per year, spread over about 185 rainy days.

Is it sunny in Mae Sai?

Mae Sai gets on average 9.3 hours of sunshine per day, roughly 3,395 hours per year over 1940-2025.

Are there tropical nights in Mae Sai?

Yes: Mae Sai has on average 205 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Mae Sai?

In Mae Sai, between 1940 and 2025, the highest apparent temperature reached 45.3 °C on 11 May 2016, and the lowest was 0.9 °C on 27 December 1999.

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