San Martín climate — normals and trends

Q: What is the climate of San Martín?

San Martín has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 25.2 °C and it receives 1,527 mm of precipitation per year.

Q: What is the hottest day ever recorded in San Martín?

The hottest day measured in San Martín between 1940 and 2025 was 19 February 2020, reaching 38.7 °C.

Q: What is the coldest day in San Martín?

The coldest day measured in San Martín between 1940 and 2025 was 6 December 1945, at 10.4 °C.

Q: Does it snow in San Martín?

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

Q: Has the climate of San Martín warmed?

Yes: San Martín warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in San Martín?

The wettest day measured in San Martín between 1940 and 2025 was 4 September 1969, with 202 mm of rain in 24 hours.

Q: What was the windiest day in San Martín?

The windiest day measured in San Martín between 1940 and 2025 was 17 January 1965, with winds reaching 28.5 km/h.

Q: What is the warmest month in San Martín?

The warmest month in San Martín is April (26.6 °C on average); the coldest is December (24.3 °C).

Q: How much does it rain in San Martín?

San Martín receives on average 1,527 mm of precipitation per year, spread over about 182 rainy days.

Q: Is it sunny in San Martín?

San Martín gets on average 10.6 hours of sunshine per day, roughly 3,869 hours per year over 1940-2025.

San Martín (El Salvador) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 25.2 °C and it receives 1,527 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 (26.6 °C on average) and the coldest is December (24.3 °C). Rainfall peaks in September.

San Martín averages 0 frost days, 258 hot days (≥ 30 °C) and 182 rainy days per year.

San Martín has warmed by +2.1 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.

The hottest day of the period reached 38.7 °C (on 19 February 2020) and the coldest 10.4 °C (on 6 December 1945).

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

San MartínCuscatlan

coords: 13.78°, -88.92°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthAprilColdest monthDecemberWettest monthSeptemberDriest monthJanuary

Mean daily temperature

25.2°C

Average daily high

31.0°C

Average daily low

20.9°C

Annual rainfall

1,527mm

Sunshine / day

10.6h

Mean relative humidity

71%

Average peak wind

9.2km/h

Seasonal range

2.3°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

258 d/yr

Rainy days (≥ 1 mm)

182 d/yr

Annual snowfall

0.0 cm

Average feels-like high

34.5 °C

Average feels-like low

23.4 °C

Average peak gust

30.6 km/h

Tropical nights (≥ 20 °C)

279 d/yr

Solar radiation

20.0 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.1 °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

38.7 °C

19 February 2020

Coldest day

10.4 °C

6 December 1945

Wettest day

202 mm

4 September 1969

Windiest day

28.5 km/h

17 January 1965

Strongest gust

74.9 km/h

17 January 1965

Hottest feels-like

41.9 °C

28 May 2024

Coldest feels-like

8.9 °C

6 December 1945

Sunniest day

12.2 h

8 June 1941

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	36.7 °C14 April 2025	17.2 °C18 January 2025	26.8 °C	1,489 mm	341
2024	38.1 °C19 March 2024	16.2 °C8 February 2024	26.6 °C	1,971 mm	319
2023	38.3 °C6 May 2023	15.9 °C16 January 2023	26.9 °C	1,454 mm	346
2022	37.0 °C19 April 2022	18.1 °C31 January 2022	26.0 °C	2,252 mm	310
2021	37.8 °C31 March 2021	15.7 °C5 February 2021	26.4 °C	1,559 mm	334
2020	38.7 °C19 February 2020	17.3 °C23 January 2020	26.2 °C	1,941 mm	315
2019	37.5 °C2 April 2019	17.0 °C22 January 2019	26.6 °C	1,488 mm	338
2018	37.4 °C21 March 2018	16.2 °C10 January 2018	26.3 °C	1,410 mm	334
2017	38.3 °C6 April 2017	14.4 °C24 January 2017	26.1 °C	1,650 mm	318
2016	38.1 °C9 April 2016	15.8 °C25 January 2016	26.5 °C	1,280 mm	343
2015	37.0 °C6 March 2015	17.3 °C28 January 2015	26.7 °C	1,333 mm	339
2014	37.5 °C8 April 2014	15.3 °C17 January 2014	26.0 °C	1,370 mm	314
2013	36.4 °C29 March 2013	15.5 °C4 March 2013	25.9 °C	1,399 mm	309
2012	36.8 °C8 March 2012	15.5 °C24 December 2012	25.8 °C	1,164 mm	327
2011	35.7 °C1 March 2011	15.6 °C8 January 2011	25.4 °C	1,804 mm	297
2010	37.0 °C23 March 2010	13.2 °C16 December 2010	25.4 °C	2,210 mm	259
2009	36.6 °C6 April 2009	16.0 °C22 January 2009	26.0 °C	1,400 mm	333
2008	35.8 °C18 April 2008	16.1 °C14 December 2008	24.9 °C	2,024 mm	238
2007	36.3 °C11 March 2007	15.8 °C21 February 2007	25.4 °C	1,574 mm	287
2006	36.2 °C25 February 2006	13.8 °C23 November 2006	25.5 °C	1,492 mm	296
2005	37.2 °C14 April 2005	13.5 °C24 November 2005	25.4 °C	2,024 mm	274
2004	36.6 °C19 March 2004	15.6 °C25 January 2004	25.7 °C	1,427 mm	324
2003	37.2 °C7 March 2003	15.7 °C8 December 2003	25.6 °C	1,331 mm	307
2002	37.0 °C13 May 2002	14.9 °C10 January 2002	25.8 °C	1,410 mm	291
2001	36.1 °C21 April 2001	15.2 °C24 January 2001	25.3 °C	1,142 mm	270
2000	35.1 °C10 April 2000	14.6 °C28 January 2000	25.0 °C	1,356 mm	259
1999	35.2 °C18 April 1999	12.1 °C29 December 1999	24.6 °C	1,798 mm	192
1998	37.6 °C15 May 1998	14.3 °C4 February 1998	25.7 °C	1,802 mm	257
1997	36.8 °C4 May 1997	14.2 °C16 December 1997	25.8 °C	1,429 mm	291
1996	34.9 °C4 March 1996	12.8 °C14 January 1996	24.9 °C	1,794 mm	243
1995	35.9 °C3 March 1995	15.7 °C1 January 1995	25.1 °C	2,051 mm	222
1994	36.4 °C18 April 1994	16.2 °C30 December 1994	25.8 °C	1,145 mm	314
1993	36.0 °C17 February 1993	14.7 °C28 January 1993	25.3 °C	1,739 mm	281
1992	37.4 °C10 May 1992	16.7 °C20 December 1992	25.6 °C	1,390 mm	296
1991	36.5 °C26 February 1991	15.6 °C13 February 1991	25.7 °C	1,273 mm	302
1990	37.5 °C10 April 1990	17.0 °C3 January 1990	25.7 °C	1,315 mm	296
1989	35.8 °C16 July 1989	12.3 °C27 December 1989	25.1 °C	1,549 mm	245
1988	36.7 °C24 March 1988	16.1 °C28 February 1988	25.3 °C	1,607 mm	248
1987	36.7 °C16 May 1987	14.5 °C7 January 1987	25.9 °C	1,272 mm	328
1986	35.9 °C7 April 1986	14.9 °C29 January 1986	25.2 °C	1,152 mm	287
1985	35.5 °C26 March 1985	16.1 °C13 January 1985	25.3 °C	1,344 mm	285
1984	35.3 °C30 March 1984	15.0 °C25 November 1984	24.7 °C	1,594 mm	204
1983	36.4 °C9 May 1983	14.6 °C21 March 1983	25.7 °C	1,312 mm	287
1982	36.3 °C1 April 1982	16.8 °C16 January 1982	25.5 °C	1,442 mm	279
1981	35.7 °C1 April 1981	12.5 °C1 January 1981	25.2 °C	1,461 mm	235
1980	35.8 °C27 March 1980	13.6 °C29 December 1980	25.5 °C	1,367 mm	285
1979	35.3 °C12 April 1979	16.1 °C20 December 1979	25.4 °C	1,678 mm	245
1978	35.4 °C16 March 1978	13.8 °C7 February 1978	25.2 °C	1,567 mm	252
1977	36.4 °C22 March 1977	14.9 °C20 January 1977	25.4 °C	1,370 mm	281
1976	35.0 °C11 April 1976	14.8 °C19 January 1976	25.0 °C	1,394 mm	269
1975	36.7 °C22 April 1975	13.3 °C24 December 1975	24.9 °C	1,571 mm	240
1974	34.8 °C25 April 1974	16.7 °C11 February 1974	25.0 °C	1,243 mm	259
1973	36.0 °C2 February 1973	15.4 °C18 December 1973	25.1 °C	1,726 mm	221
1972	36.3 °C6 April 1972	15.8 °C22 February 1972	25.6 °C	1,329 mm	297
1971	35.2 °C3 May 1971	15.3 °C15 February 1971	24.7 °C	1,474 mm	204
1970	36.2 °C23 April 1970	13.8 °C5 February 1970	24.8 °C	1,618 mm	214
1969	35.6 °C19 March 1969	16.2 °C22 November 1969	24.9 °C	2,129 mm	194
1968	35.2 °C2 April 1968	14.8 °C25 March 1968	24.8 °C	1,573 mm	232
1967	35.6 °C4 April 1967	14.6 °C18 March 1967	25.2 °C	1,096 mm	264
1966	35.2 °C21 April 1966	14.6 °C28 January 1966	24.9 °C	1,566 mm	218
1965	35.7 °C20 March 1965	14.8 °C31 January 1965	25.0 °C	1,420 mm	269
1964	36.0 °C7 March 1964	15.3 °C2 January 1964	25.0 °C	1,345 mm	254
1963	35.3 °C17 April 1963	14.0 °C26 December 1963	25.0 °C	1,486 mm	273
1962	35.8 °C4 April 1962	14.5 °C4 January 1962	24.5 °C	1,423 mm	249
1961	35.7 °C19 April 1961	16.2 °C27 December 1961	24.6 °C	1,381 mm	228
1960	34.5 °C1 March 1960	13.7 °C31 January 1960	24.0 °C	1,672 mm	186
1959	34.6 °C12 March 1959	15.0 °C5 December 1959	24.4 °C	1,366 mm	222
1958	35.5 °C6 April 1958	14.1 °C9 January 1958	24.9 °C	1,657 mm	247
1957	34.8 °C5 May 1957	13.3 °C11 December 1957	24.6 °C	1,546 mm	250
1956	35.6 °C31 March 1956	10.4 °C15 January 1956	24.0 °C	1,434 mm	174
1955	36.1 °C27 March 1955	14.9 °C29 December 1955	24.0 °C	1,631 mm	161
1954	35.2 °C5 March 1954	15.1 °C8 December 1954	24.2 °C	1,815 mm	167
1953	35.2 °C20 April 1953	13.8 °C11 January 1953	24.9 °C	1,643 mm	219
1952	34.3 °C22 March 1952	15.1 °C28 February 1952	24.7 °C	1,591 mm	221
1951	35.6 °C20 March 1951	13.9 °C12 January 1951	24.8 °C	1,479 mm	243
1950	34.7 °C16 April 1950	13.2 °C29 November 1950	23.8 °C	1,982 mm	149
1949	34.8 °C16 March 1949	15.2 °C2 January 1949	24.1 °C	1,693 mm	176
1948	35.3 °C3 April 1948	14.2 °C16 January 1948	24.5 °C	1,646 mm	163
1947	35.9 °C25 March 1947	14.1 °C16 February 1947	24.6 °C	1,451 mm	177
1946	35.6 °C1 April 1946	16.3 °C15 December 1946	24.4 °C	1,202 mm	202
1945	33.5 °C17 March 1945	10.4 °C6 December 1945	24.0 °C	1,764 mm	144
1944	33.7 °C5 March 1944	13.7 °C8 January 1944	24.1 °C	1,326 mm	176
1943	34.9 °C16 April 1943	12.1 °C22 December 1943	24.1 °C	1,443 mm	201
1942	36.2 °C28 March 1942	15.6 °C27 January 1942	24.4 °C	1,536 mm	162
1941	36.5 °C19 March 1941	13.8 °C12 February 1941	25.0 °C	1,036 mm	280
1940	35.0 °C14 March 1940	15.4 °C24 February 1940	24.6 °C	1,190 mm	217

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

+1.6 °C

Hot days (≥ 30 °C)

341 d/yr

+83

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1489 mm

-39 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	33.1 °C	+1.7 °C	9 mm	+5 mm
Feb	34.0 °C	+1.6 °C	11 mm	+7 mm
Mar	34.0 °C	+1.0 °C	16 mm	-0 mm
Apr	33.7 °C	+1.0 °C	65 mm	+6 mm
May	32.9 °C	+1.6 °C	113 mm	-93 mm
Jun	31.4 °C	+1.5 °C	373 mm	+97 mm
Jul	33.2 °C	+2.3 °C	142 mm	-42 mm
Aug	32.9 °C	+2.1 °C	174 mm	-38 mm
Sep	31.4 °C	+1.9 °C	255 mm	-35 mm
Oct	30.6 °C	+1.2 °C	276 mm	+60 mm
Nov	32.1 °C	+2.0 °C	20 mm	-29 mm
Dec	32.3 °C	+1.5 °C	33 mm	+24 mm

The year's extremes

Hottest day

36.7 °C

14 Apr 2025

Coldest day

17.2 °C

18 Jan 2025

Wettest day

35.3 mm

13 Oct 2025

Windiest day

22.1 km/h

22 Jan 2025

Strongest gust

59.0 km/h

22 Jan 2025

Hottest feels-like

40.5 °C

13 May 2025

Coldest feels-like

17.7 °C

18 Jan 2025

Sunniest day

12.1 h

29 May 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 San Martín?

San Martín has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 25.2 °C and it receives 1,527 mm of precipitation per year.

What is the hottest day ever recorded in San Martín?

The hottest day measured in San Martín between 1940 and 2025 was 19 February 2020, reaching 38.7 °C.

What is the coldest day in San Martín?

The coldest day measured in San Martín between 1940 and 2025 was 6 December 1945, at 10.4 °C.

Does it snow in San Martín?

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

Has the climate of San Martín warmed?

Yes: San Martín warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in San Martín?

The wettest day measured in San Martín between 1940 and 2025 was 4 September 1969, with 202 mm of rain in 24 hours.

What was the windiest day in San Martín?

The windiest day measured in San Martín between 1940 and 2025 was 17 January 1965, with winds reaching 28.5 km/h.

What is the warmest month in San Martín?

The warmest month in San Martín is April (26.6 °C on average); the coldest is December (24.3 °C).

How much does it rain in San Martín?

San Martín receives on average 1,527 mm of precipitation per year, spread over about 182 rainy days.

Is it sunny in San Martín?

San Martín gets on average 10.6 hours of sunshine per day, roughly 3,869 hours per year over 1940-2025.

Are there tropical nights in San Martín?

Yes: San Martín has on average 279 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in San Martín?

In San Martín, between 1940 and 2025, the highest apparent temperature reached 41.9 °C on 28 May 2024, and the lowest was 8.9 °C on 6 December 1945.

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