La Union climate — normals and trends

Q: What is the climate of La Union?

La Union has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.5 °C and it receives 1,719 mm of precipitation per year.

Q: What is the hottest day ever recorded in La Union?

The hottest day measured in La Union between 1940 and 2025 was 16 April 2005, reaching 34.0 °C.

Q: What is the coldest day in La Union?

The coldest day measured in La Union between 1940 and 2025 was 6 December 1945, at 20.9 °C.

Q: Does it snow in La Union?

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

Q: Has the climate of La Union warmed?

Yes: La Union warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in La Union?

The wettest day measured in La Union between 1940 and 2025 was 31 October 1998, with 222 mm of rain in 24 hours.

Q: What was the windiest day in La Union?

The windiest day measured in La Union between 1940 and 2025 was 31 October 1998, with winds reaching 48.9 km/h.

Q: What is the warmest month in La Union?

The warmest month in La Union is July (28.4 °C on average); the coldest is October (26.9 °C).

Q: How much does it rain in La Union?

La Union receives on average 1,719 mm of precipitation per year, spread over about 147 rainy days.

Q: Is it sunny in La Union?

La Union gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.

La Union (El Salvador) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 27.5 °C and it receives 1,719 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 July (28.4 °C on average) and the coldest is October (26.9 °C). Rainfall peaks in September.

La Union averages 0 frost days, 73 hot days (≥ 30 °C) and 147 rainy days per year.

La Union has warmed by +1.0 °C between 1940 and 2025, or +0.12 °C per decade. This trend is statistically significant.

The hottest day of the period reached 34.0 °C (on 16 April 2005) and the coldest 20.9 °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

La UnionLa Union

coords: 13.34°, -87.84°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthJulyColdest monthOctoberWettest monthSeptemberDriest monthJanuary

Mean daily temperature

27.5°C

Average daily high

28.9°C

Average daily low

26.1°C

Annual rainfall

1,719mm

Sunshine / day

11.0h

Mean relative humidity

74%

Average peak wind

20.2km/h

Seasonal range

1.5°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

73 d/yr

Rainy days (≥ 1 mm)

147 d/yr

Annual snowfall

0.0 cm

Average feels-like high

34.1 °C

Average feels-like low

29.1 °C

Average peak gust

29.2 km/h

Tropical nights (≥ 20 °C)

364 d/yr

Solar radiation

21.6 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.0 °C

since 1940

+0.1 °C per decade · r² = 0.42 · 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

34.0 °C

16 April 2005

Coldest day

20.9 °C

6 December 1945

Wettest day

222 mm

31 October 1998

Windiest day

48.9 km/h

31 October 1998

Strongest gust

77.0 km/h

9 October 2022

Hottest feels-like

40.7 °C

6 May 1957

Coldest feels-like

16.7 °C

26 December 1989

Sunniest day

12.4 h

7 June 1946

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	33.4 °C19 July 2025	24.2 °C8 December 2025	28.5 °C	1,400 mm	164
2024	33.9 °C13 April 2024	23.8 °C7 February 2024	28.3 °C	2,367 mm	144
2023	33.2 °C20 July 2023	22.8 °C15 January 2023	28.5 °C	1,502 mm	175
2022	32.0 °C2 August 2022	24.2 °C29 August 2022	27.6 °C	2,219 mm	59
2021	33.4 °C2 April 2021	22.8 °C3 February 2021	28.0 °C	1,981 mm	112
2020	32.5 °C7 March 2020	23.8 °C10 December 2020	27.9 °C	2,152 mm	106
2019	33.0 °C27 June 2019	24.6 °C22 January 2019	28.3 °C	1,312 mm	131
2018	32.6 °C22 March 2018	22.9 °C15 January 2018	28.0 °C	1,406 mm	130
2017	32.3 °C26 July 2017	23.2 °C27 October 2017	27.8 °C	1,970 mm	103
2016	32.6 °C22 March 2016	23.2 °C8 February 2016	28.3 °C	1,636 mm	136
2015	33.3 °C4 August 2015	24.1 °C28 January 2015	28.6 °C	1,350 mm	204
2014	33.1 °C23 July 2014	22.9 °C17 January 2014	28.1 °C	1,448 mm	132
2013	32.3 °C26 July 2013	22.9 °C3 March 2013	27.9 °C	1,418 mm	92
2012	32.8 °C28 July 2012	23.6 °C6 January 2012	27.8 °C	1,736 mm	109
2011	31.6 °C12 June 2011	23.6 °C1 December 2011	27.3 °C	2,385 mm	42
2010	32.9 °C22 March 2010	21.4 °C15 December 2010	27.3 °C	3,010 mm	57
2009	32.6 °C27 July 2009	22.6 °C3 March 2009	27.8 °C	1,219 mm	95
2008	32.2 °C16 April 2008	23.1 °C4 January 2008	27.2 °C	2,466 mm	48
2007	32.6 °C5 March 2007	23.5 °C19 February 2007	27.6 °C	2,024 mm	79
2006	32.8 °C30 June 2006	21.3 °C14 February 2006	27.8 °C	1,916 mm	95
2005	34.0 °C16 April 2005	23.0 °C19 January 2005	27.5 °C	2,351 mm	73
2004	32.7 °C19 April 2004	23.9 °C28 December 2004	27.9 °C	1,451 mm	122
2003	32.5 °C31 July 2003	22.8 °C20 December 2003	27.8 °C	1,841 mm	100
2002	33.1 °C15 August 2002	22.7 °C10 January 2002	28.0 °C	1,423 mm	131
2001	32.6 °C4 July 2001	23.0 °C24 January 2001	27.7 °C	1,402 mm	97
2000	32.2 °C9 April 2000	23.3 °C27 January 2000	27.4 °C	1,564 mm	58
1999	32.8 °C18 April 1999	22.2 °C29 December 1999	27.1 °C	2,525 mm	54
1998	32.8 °C10 March 1998	23.9 °C4 February 1998	27.9 °C	2,527 mm	104
1997	33.4 °C23 July 1997	22.4 °C16 December 1997	28.1 °C	1,365 mm	135
1996	31.9 °C23 July 1996	21.8 °C12 March 1996	27.1 °C	2,170 mm	34
1995	31.8 °C11 July 1995	24.4 °C1 January 1995	27.4 °C	2,719 mm	34
1994	32.8 °C16 July 1994	23.5 °C28 December 1994	27.7 °C	1,107 mm	72
1993	32.7 °C20 July 1993	22.8 °C28 January 1993	27.6 °C	2,030 mm	75
1992	32.5 °C10 May 1992	23.5 °C8 February 1992	27.8 °C	1,467 mm	85
1991	32.6 °C27 July 1991	23.4 °C10 February 1991	27.8 °C	1,030 mm	78
1990	32.8 °C9 April 1990	23.6 °C11 December 1990	27.9 °C	1,519 mm	105
1989	33.0 °C16 July 1989	20.9 °C25 December 1989	27.2 °C	1,702 mm	38
1988	31.9 °C27 March 1988	22.8 °C27 January 1988	27.2 °C	1,903 mm	44
1987	32.6 °C14 July 1987	22.6 °C6 January 1987	28.1 °C	1,066 mm	114
1986	31.9 °C28 July 1986	22.0 °C28 January 1986	27.5 °C	995 mm	84
1985	31.6 °C8 July 1985	22.2 °C6 January 1985	27.1 °C	1,393 mm	45
1984	31.0 °C17 April 1984	22.5 °C1 March 1984	27.1 °C	1,555 mm	25
1983	32.6 °C20 July 1983	23.7 °C14 January 1983	28.0 °C	1,167 mm	101
1982	32.3 °C24 August 1982	24.2 °C14 October 1982	27.7 °C	1,958 mm	94
1981	32.0 °C10 April 1981	21.4 °C1 January 1981	27.2 °C	1,877 mm	45
1980	32.6 °C16 April 1980	22.2 °C29 December 1980	27.7 °C	1,647 mm	80
1979	32.8 °C10 August 1979	23.4 °C16 November 1979	27.4 °C	2,166 mm	84
1978	31.3 °C17 March 1978	22.3 °C23 February 1978	27.2 °C	1,763 mm	35
1977	32.7 °C9 April 1977	21.8 °C20 January 1977	27.6 °C	1,319 mm	71
1976	32.3 °C17 July 1976	22.2 °C19 January 1976	27.2 °C	1,359 mm	69
1975	31.2 °C21 April 1975	22.0 °C24 December 1975	26.8 °C	1,647 mm	15
1974	32.3 °C16 August 1974	23.0 °C13 March 1974	26.9 °C	1,391 mm	19
1973	32.0 °C3 February 1973	21.7 °C18 December 1973	27.1 °C	2,012 mm	34
1972	33.3 °C6 August 1972	23.1 °C22 February 1972	27.8 °C	1,357 mm	88
1971	30.9 °C22 July 1971	23.4 °C22 January 1971	26.8 °C	1,837 mm	17
1970	32.6 °C23 April 1970	21.8 °C5 February 1970	27.1 °C	1,773 mm	53
1969	32.7 °C17 July 1969	23.2 °C20 January 1969	27.4 °C	2,978 mm	64
1968	32.7 °C29 July 1968	22.1 °C9 February 1968	26.9 °C	2,095 mm	47
1967	31.8 °C27 July 1967	23.0 °C6 January 1967	27.3 °C	983 mm	53
1966	31.5 °C24 February 1966	22.6 °C30 November 1966	27.2 °C	1,688 mm	44
1965	31.8 °C14 July 1965	21.9 °C19 January 1965	27.4 °C	1,575 mm	55
1964	30.8 °C7 March 1964	22.5 °C2 January 1964	27.0 °C	1,323 mm	10
1963	31.6 °C23 March 1963	21.7 °C26 December 1963	27.3 °C	1,921 mm	49
1962	31.7 °C3 April 1962	23.0 °C3 January 1962	27.0 °C	1,561 mm	36
1961	32.3 °C9 March 1961	22.8 °C26 December 1961	27.4 °C	1,476 mm	61
1960	31.4 °C1 July 1960	22.1 °C31 January 1960	27.2 °C	1,935 mm	40
1959	31.7 °C26 April 1959	23.4 °C14 June 1959	27.5 °C	1,464 mm	62
1958	32.1 °C28 June 1958	22.7 °C9 January 1958	27.6 °C	1,900 mm	76
1957	32.9 °C6 May 1957	22.4 °C11 December 1957	27.6 °C	2,020 mm	76
1956	31.1 °C27 July 1956	20.9 °C14 January 1956	26.9 °C	1,514 mm	32
1955	30.8 °C12 February 1955	23.2 °C1 February 1955	26.6 °C	1,897 mm	12
1954	31.7 °C16 March 1954	22.1 °C21 December 1954	26.8 °C	2,083 mm	25
1953	32.4 °C5 August 1953	22.7 °C13 January 1953	27.4 °C	2,018 mm	76
1952	31.4 °C25 July 1952	22.6 °C28 February 1952	27.2 °C	1,685 mm	46
1951	32.3 °C22 July 1951	22.1 °C4 February 1951	27.4 °C	1,610 mm	61
1950	31.3 °C30 March 1950	22.9 °C29 November 1950	26.7 °C	2,144 mm	15
1949	31.9 °C27 July 1949	23.5 °C2 January 1949	27.2 °C	1,601 mm	60
1948	31.8 °C13 March 1948	22.7 °C16 January 1948	27.3 °C	1,942 mm	61
1947	31.3 °C1 July 1947	23.0 °C16 February 1947	27.1 °C	1,624 mm	26
1946	31.5 °C2 July 1946	24.1 °C10 February 1946	27.3 °C	974 mm	68
1945	31.8 °C7 April 1945	20.9 °C6 December 1945	26.9 °C	1,945 mm	24
1944	31.9 °C6 April 1944	22.7 °C19 January 1944	27.2 °C	1,428 mm	34
1943	32.1 °C22 July 1943	22.2 °C20 December 1943	27.0 °C	1,258 mm	34
1942	32.3 °C4 April 1942	23.2 °C26 July 1942	26.9 °C	1,520 mm	43
1941	32.9 °C31 July 1941	23.1 °C12 January 1941	28.0 °C	1,115 mm	138
1940	32.6 °C15 July 1940	23.6 °C30 January 1940	27.6 °C	1,275 mm	82

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

29.9 °C

+1.0 °C

Hot days (≥ 30 °C)

164 d/yr

+91

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1400 mm

-319 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	29.9 °C	+1.2 °C	2 mm	-0 mm
Feb	29.9 °C	+1.2 °C	3 mm	+0 mm
Mar	29.6 °C	+0.9 °C	13 mm	+3 mm
Apr	30.4 °C	+1.3 °C	23 mm	-16 mm
May	30.3 °C	+1.2 °C	84 mm	-142 mm
Jun	30.1 °C	+1.0 °C	328 mm	+11 mm
Jul	31.1 °C	+1.1 °C	63 mm	-85 mm
Aug	30.3 °C	+0.8 °C	71 mm	-159 mm
Sep	29.4 °C	+0.9 °C	366 mm	-19 mm
Oct	28.6 °C	+0.3 °C	421 mm	+118 mm
Nov	29.4 °C	+0.8 °C	7 mm	-45 mm
Dec	29.4 °C	+0.6 °C	20 mm	+14 mm

The year's extremes

Hottest day

33.4 °C

19 Jul 2025

Coldest day

24.2 °C

8 Dec 2025

Wettest day

52.2 mm

5 Oct 2025

Windiest day

35.9 km/h

9 Apr 2025

Strongest gust

49.0 km/h

9 Apr 2025

Hottest feels-like

40.2 °C

29 May 2025

Coldest feels-like

24.2 °C

12 Nov 2025

Sunniest day

12.4 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 La Union?

La Union has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.5 °C and it receives 1,719 mm of precipitation per year.

What is the hottest day ever recorded in La Union?

The hottest day measured in La Union between 1940 and 2025 was 16 April 2005, reaching 34.0 °C.

What is the coldest day in La Union?

The coldest day measured in La Union between 1940 and 2025 was 6 December 1945, at 20.9 °C.

Does it snow in La Union?

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

Has the climate of La Union warmed?

Yes: La Union warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in La Union?

The wettest day measured in La Union between 1940 and 2025 was 31 October 1998, with 222 mm of rain in 24 hours.

What was the windiest day in La Union?

The windiest day measured in La Union between 1940 and 2025 was 31 October 1998, with winds reaching 48.9 km/h.

What is the warmest month in La Union?

The warmest month in La Union is July (28.4 °C on average); the coldest is October (26.9 °C).

How much does it rain in La Union?

La Union receives on average 1,719 mm of precipitation per year, spread over about 147 rainy days.

Is it sunny in La Union?

La Union gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.

Are there tropical nights in La Union?

Yes: La Union has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in La Union?

In La Union, between 1940 and 2025, the highest apparent temperature reached 40.7 °C on 6 May 1957, and the lowest was 16.7 °C on 26 December 1989.

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