Sai Mai climate — normals and trends

Q: What is the climate of Sai Mai?

Sai Mai has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.8 °C and it receives 1,505 mm of precipitation per year.

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

The hottest day measured in Sai Mai between 1940 and 2025 was 20 April 1979, reaching 40.4 °C.

Q: What is the coldest day in Sai Mai?

The coldest day measured in Sai Mai between 1940 and 2025 was 12 January 1955, at 10.0 °C.

Q: Does it snow in Sai Mai?

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

Q: Has the climate of Sai Mai warmed?

Yes: Sai Mai warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Sai Mai?

The wettest day measured in Sai Mai between 1940 and 2025 was 17 October 1988, with 120 mm of rain in 24 hours.

Q: What was the windiest day in Sai Mai?

The windiest day measured in Sai Mai between 1940 and 2025 was 3 November 2009, with winds reaching 26.6 km/h.

Q: What is the warmest month in Sai Mai?

The warmest month in Sai Mai is April (29.8 °C on average); the coldest is December (25.4 °C).

Q: How much does it rain in Sai Mai?

Sai Mai receives on average 1,505 mm of precipitation per year, spread over about 193 rainy days.

Q: Is it sunny in Sai Mai?

Sai Mai gets on average 10.1 hours of sunshine per day, roughly 3,687 hours per year over 1940-2025.

Sai Mai (Thailand) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 27.8 °C and it receives 1,505 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 (29.8 °C on average) and the coldest is December (25.4 °C). Rainfall peaks in September.

Sai Mai averages 0 frost days, 327 hot days (≥ 30 °C) and 193 rainy days per year.

Sai Mai has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.

The hottest day of the period reached 40.4 °C (on 20 April 1979) and the coldest 10.0 °C (on 12 January 1955).

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

Sai MaiBangkok

coords: 13.92°, 100.65°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthAprilColdest monthDecemberWettest monthSeptemberDriest monthDecember

Mean daily temperature

27.8°C

Average daily high

32.5°C

Average daily low

24.1°C

Annual rainfall

1,505mm

Sunshine / day

10.1h

Mean relative humidity

75%

Average peak wind

12.2km/h

Seasonal range

4.4°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

327 d/yr

Rainy days (≥ 1 mm)

193 d/yr

Annual snowfall

0.0 cm

Average feels-like high

37.5 °C

Average feels-like low

28.3 °C

Average peak gust

29.5 km/h

Tropical nights (≥ 20 °C)

334 d/yr

Solar radiation

18.6 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.9 °C

since 1940

+0.2 °C per decade · r² = 0.73 · 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

40.4 °C

20 April 1979

Coldest day

10.0 °C

12 January 1955

Wettest day

120 mm

17 October 1988

Windiest day

26.6 km/h

3 November 2009

Strongest gust

73.4 km/h

8 August 2008

Hottest feels-like

47.2 °C

18 April 1953

Coldest feels-like

7.8 °C

12 January 1955

Sunniest day

12.8 h

13 July 1941

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	36.5 °C28 March 2025	15.6 °C29 November 2025	28.1 °C	1,573 mm	339
2024	39.2 °C21 April 2024	17.9 °C23 December 2024	29.2 °C	1,284 mm	357
2023	39.5 °C6 May 2023	17.1 °C31 January 2023	29.1 °C	1,140 mm	348
2022	36.6 °C14 April 2022	18.4 °C26 December 2022	28.2 °C	1,714 mm	345
2021	37.0 °C31 March 2021	15.2 °C13 January 2021	28.2 °C	1,688 mm	338
2020	37.9 °C22 April 2020	18.1 °C22 December 2020	28.8 °C	1,412 mm	343
2019	38.2 °C4 May 2019	16.5 °C7 December 2019	28.8 °C	1,218 mm	344
2018	36.0 °C15 April 2018	17.1 °C13 January 2018	28.2 °C	1,588 mm	342
2017	37.5 °C25 April 2017	13.9 °C20 December 2017	28.4 °C	1,641 mm	342
2016	38.9 °C13 April 2016	14.5 °C8 February 2016	28.9 °C	1,262 mm	351
2015	38.9 °C1 June 2015	16.0 °C16 January 2015	28.8 °C	1,283 mm	343
2014	37.2 °C27 April 2014	13.4 °C25 January 2014	28.4 °C	1,221 mm	344
2013	38.9 °C16 May 2013	14.6 °C28 December 2013	28.3 °C	1,521 mm	333
2012	38.4 °C21 April 2012	19.4 °C9 January 2012	28.7 °C	1,325 mm	359
2011	35.9 °C4 May 2011	17.0 °C12 December 2011	27.7 °C	1,725 mm	325
2010	39.0 °C10 May 2010	18.4 °C31 December 2010	28.7 °C	1,510 mm	343
2009	38.7 °C24 April 2009	13.7 °C12 January 2009	28.1 °C	1,426 mm	344
2008	36.9 °C30 March 2008	16.4 °C10 December 2008	27.8 °C	1,515 mm	327
2007	38.1 °C1 April 2007	14.8 °C4 February 2007	28.3 °C	1,439 mm	342
2006	36.6 °C3 May 2006	15.6 °C24 December 2006	28.5 °C	1,482 mm	346
2005	38.3 °C3 May 2005	14.6 °C3 January 2005	28.6 °C	1,393 mm	338
2004	39.1 °C15 April 2004	17.2 °C26 January 2004	28.2 °C	1,203 mm	351
2003	37.8 °C6 May 2003	15.5 °C13 January 2003	28.3 °C	1,331 mm	345
2002	38.1 °C9 April 2002	17.0 °C3 January 2002	28.6 °C	1,467 mm	350
2001	38.4 °C20 April 2001	16.5 °C24 December 2001	28.2 °C	1,392 mm	341
2000	37.7 °C4 April 2000	15.1 °C4 February 2000	27.9 °C	1,568 mm	344
1999	37.3 °C20 March 1999	11.1 °C25 December 1999	27.6 °C	1,768 mm	322
1998	39.3 °C14 April 1998	18.2 °C17 December 1998	29.0 °C	1,266 mm	346
1997	40.2 °C20 June 1997	15.7 °C13 January 1997	28.6 °C	1,105 mm	352
1996	38.4 °C31 March 1996	13.2 °C2 January 1996	27.8 °C	1,756 mm	339
1995	39.4 °C23 April 1995	12.5 °C8 January 1995	28.0 °C	1,818 mm	335
1994	38.7 °C4 May 1994	15.6 °C29 December 1994	28.0 °C	1,481 mm	345
1993	39.2 °C1 May 1993	14.0 °C31 January 1993	27.8 °C	1,271 mm	335
1992	39.0 °C21 April 1992	14.8 °C19 January 1992	28.0 °C	1,170 mm	325
1991	37.0 °C13 April 1991	18.1 °C20 November 1991	28.2 °C	1,235 mm	348
1990	39.5 °C16 April 1990	15.0 °C6 December 1990	28.3 °C	1,328 mm	345
1989	38.4 °C19 April 1989	16.7 °C4 December 1989	28.1 °C	1,234 mm	344
1988	36.9 °C31 March 1988	16.1 °C20 January 1988	27.8 °C	1,796 mm	329
1987	39.2 °C11 April 1987	14.9 °C8 December 1987	28.1 °C	1,324 mm	332
1986	37.2 °C30 March 1986	14.5 °C7 January 1986	27.5 °C	1,501 mm	327
1985	39.2 °C13 April 1985	14.7 °C24 December 1985	27.6 °C	1,583 mm	326
1984	38.8 °C5 May 1984	12.6 °C10 January 1984	27.6 °C	1,120 mm	336
1983	39.1 °C22 May 1983	12.5 °C25 January 1983	27.8 °C	1,507 mm	312
1982	38.1 °C24 March 1982	10.8 °C29 December 1982	27.4 °C	1,401 mm	318
1981	36.9 °C24 March 1981	12.9 °C14 January 1981	27.4 °C	1,528 mm	314
1980	40.1 °C25 April 1980	16.0 °C26 December 1980	28.1 °C	1,366 mm	343
1979	40.4 °C20 April 1979	14.9 °C27 December 1979	28.2 °C	1,240 mm	348
1978	38.6 °C29 April 1978	15.7 °C16 December 1978	27.9 °C	1,691 mm	340
1977	38.2 °C18 April 1977	16.3 °C6 March 1977	27.9 °C	1,106 mm	338
1976	39.0 °C13 April 1976	11.9 °C1 January 1976	27.3 °C	1,860 mm	324
1975	38.4 °C30 April 1975	11.9 °C29 December 1975	27.1 °C	1,966 mm	318
1974	36.2 °C22 April 1974	12.3 °C5 January 1974	27.1 °C	1,755 mm	325
1973	38.7 °C23 April 1973	12.5 °C27 December 1973	27.8 °C	1,378 mm	331
1972	38.6 °C12 May 1972	13.3 °C16 January 1972	27.6 °C	1,845 mm	325
1971	36.7 °C8 April 1971	13.5 °C5 January 1971	26.8 °C	1,496 mm	300
1970	37.5 °C11 May 1970	16.7 °C1 January 1970	27.4 °C	1,517 mm	325
1969	37.6 °C3 April 1969	13.9 °C23 December 1969	27.7 °C	1,500 mm	317
1968	37.1 °C30 March 1968	12.9 °C6 January 1968	27.4 °C	1,286 mm	337
1967	39.2 °C2 May 1967	12.5 °C17 January 1967	27.2 °C	1,410 mm	321
1966	37.3 °C29 April 1966	15.8 °C2 January 1966	27.2 °C	1,916 mm	291
1965	37.8 °C1 May 1965	14.1 °C18 January 1965	27.4 °C	1,778 mm	330
1964	38.5 °C6 April 1964	14.0 °C19 December 1964	27.3 °C	1,617 mm	309
1963	37.5 °C23 April 1963	10.7 °C16 January 1963	27.2 °C	1,610 mm	311
1962	36.9 °C11 April 1962	13.1 °C28 January 1962	27.2 °C	1,548 mm	320
1961	37.4 °C8 April 1961	12.6 °C19 January 1961	27.4 °C	1,252 mm	325
1960	39.9 °C25 April 1960	11.5 °C4 January 1960	27.8 °C	1,370 mm	326
1959	36.8 °C27 April 1959	16.0 °C14 January 1959	27.6 °C	1,365 mm	323
1958	38.7 °C5 April 1958	15.9 °C25 November 1958	27.6 °C	1,287 mm	299
1957	38.7 °C17 May 1957	15.5 °C1 January 1957	27.6 °C	1,791 mm	333
1956	36.8 °C23 March 1956	13.0 °C17 January 1956	26.9 °C	1,530 mm	308
1955	37.9 °C18 April 1955	10.0 °C12 January 1955	26.9 °C	1,861 mm	313
1954	38.7 °C16 April 1954	12.3 °C17 December 1954	27.5 °C	1,159 mm	333
1953	36.0 °C17 April 1953	13.8 °C12 December 1953	26.4 °C	2,908 mm	274
1952	35.8 °C13 May 1952	13.8 °C12 December 1952	27.1 °C	1,971 mm	312
1951	38.9 °C10 April 1951	15.3 °C17 January 1951	27.5 °C	1,293 mm	316
1950	38.6 °C23 April 1950	16.2 °C26 December 1950	27.1 °C	1,515 mm	301
1949	36.8 °C24 February 1949	13.5 °C17 January 1949	27.2 °C	1,194 mm	316
1948	36.3 °C13 March 1948	13.9 °C3 January 1948	27.0 °C	1,493 mm	303
1947	37.3 °C7 May 1947	14.3 °C30 December 1947	27.4 °C	1,362 mm	330
1946	37.9 °C10 March 1946	13.3 °C9 January 1946	27.0 °C	1,517 mm	316
1945	36.6 °C3 March 1945	14.0 °C31 December 1945	27.0 °C	1,749 mm	313
1944	38.0 °C4 May 1944	13.4 °C21 December 1944	27.1 °C	1,633 mm	290
1943	37.0 °C7 April 1943	14.6 °C13 January 1943	26.5 °C	1,704 mm	271
1942	36.8 °C24 February 1942	13.9 °C16 December 1942	26.5 °C	1,543 mm	269
1941	38.3 °C10 March 1941	18.6 °C25 December 1941	27.1 °C	1,669 mm	264
1940	38.6 °C11 March 1940	12.8 °C4 January 1940	26.7 °C	1,841 mm	278

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

32.6 °C

+0.1 °C

Hot days (≥ 30 °C)

339 d/yr

+12

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1573 mm

+68 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	30.8 °C	-0.9 °C	0 mm	-18 mm
Feb	33.1 °C	+0.1 °C	28 mm	-5 mm
Mar	34.3 °C	-0.1 °C	54 mm	-4 mm
Apr	34.9 °C	-0.1 °C	93 mm	-3 mm
May	33.1 °C	-0.7 °C	262 mm	+74 mm
Jun	33.4 °C	+0.7 °C	150 mm	-33 mm
Jul	32.5 °C	+0.3 °C	209 mm	+19 mm
Aug	33.2 °C	+1.1 °C	154 mm	-51 mm
Sep	32.2 °C	+0.5 °C	386 mm	+94 mm
Oct	32.4 °C	+0.9 °C	136 mm	-53 mm
Nov	30.3 °C	-1.0 °C	94 mm	+47 mm
Dec	31.7 °C	+0.7 °C	9 mm	+1 mm

The year's extremes

Hottest day

36.5 °C

28 Mar 2025

Coldest day

15.6 °C

29 Nov 2025

Wettest day

59.4 mm

7 Sep 2025

Windiest day

22.3 km/h

22 Jul 2025

Strongest gust

66.2 km/h

23 Jul 2025

Hottest feels-like

44.8 °C

25 Apr 2025

Coldest feels-like

14.7 °C

29 Nov 2025

Sunniest day

12.6 h

17 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 Sai Mai?

Sai Mai has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.8 °C and it receives 1,505 mm of precipitation per year.

What is the hottest day ever recorded in Sai Mai?

The hottest day measured in Sai Mai between 1940 and 2025 was 20 April 1979, reaching 40.4 °C.

What is the coldest day in Sai Mai?

The coldest day measured in Sai Mai between 1940 and 2025 was 12 January 1955, at 10.0 °C.

Does it snow in Sai Mai?

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

Has the climate of Sai Mai warmed?

Yes: Sai Mai warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Sai Mai?

The wettest day measured in Sai Mai between 1940 and 2025 was 17 October 1988, with 120 mm of rain in 24 hours.

What was the windiest day in Sai Mai?

The windiest day measured in Sai Mai between 1940 and 2025 was 3 November 2009, with winds reaching 26.6 km/h.

What is the warmest month in Sai Mai?

The warmest month in Sai Mai is April (29.8 °C on average); the coldest is December (25.4 °C).

How much does it rain in Sai Mai?

Sai Mai receives on average 1,505 mm of precipitation per year, spread over about 193 rainy days.

Is it sunny in Sai Mai?

Sai Mai gets on average 10.1 hours of sunshine per day, roughly 3,687 hours per year over 1940-2025.

Are there tropical nights in Sai Mai?

Yes: Sai Mai has on average 334 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Sai Mai?

In Sai Mai, between 1940 and 2025, the highest apparent temperature reached 47.2 °C on 18 April 1953, and the lowest was 7.8 °C on 12 January 1955.

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