Retalhuleu climate — normals and trends

Q: What is the climate of Retalhuleu?

Retalhuleu has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 25.7 °C and it receives 2,678 mm of precipitation per year.

Q: What is the hottest day ever recorded in Retalhuleu?

The hottest day measured in Retalhuleu between 1940 and 2025 was 22 March 2024, reaching 37.4 °C.

Q: What is the coldest day in Retalhuleu?

The coldest day measured in Retalhuleu between 1940 and 2025 was 16 January 1956, at 14.4 °C.

Q: Does it snow in Retalhuleu?

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

Q: Has the climate of Retalhuleu warmed?

Yes: Retalhuleu warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Retalhuleu?

The wettest day measured in Retalhuleu between 1940 and 2025 was 5 July 2021, with 245 mm of rain in 24 hours.

Q: What was the windiest day in Retalhuleu?

The windiest day measured in Retalhuleu between 1940 and 2025 was 11 July 1942, with winds reaching 27.3 km/h.

Q: What is the warmest month in Retalhuleu?

The warmest month in Retalhuleu is April (27.0 °C on average); the coldest is December (25.0 °C).

Q: How much does it rain in Retalhuleu?

Retalhuleu receives on average 2,678 mm of precipitation per year, spread over about 232 rainy days.

Q: Is it sunny in Retalhuleu?

Retalhuleu gets on average 10.3 hours of sunshine per day, roughly 3,760 hours per year over 1940-2025.

Retalhuleu (Guatemala) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 25.7 °C and it receives 2,678 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 (27.0 °C on average) and the coldest is December (25.0 °C). Rainfall peaks in September.

Retalhuleu averages 0 frost days, 205 hot days (≥ 30 °C) and 232 rainy days per year.

Retalhuleu has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.

The hottest day of the period reached 37.4 °C (on 22 March 2024) and the coldest 14.4 °C (on 16 January 1956).

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

RetalhuleuRetalhuleu

coords: 14.54°, -91.68°
period: 1940–2025 · 86 yrs

AmTropical monsoonWarmest monthAprilColdest monthDecemberWettest monthSeptemberDriest monthFebruary

Mean daily temperature

25.7°C

Average daily high

30.3°C

Average daily low

22.2°C

Annual rainfall

2,678mm

Sunshine / day

10.3h

Mean relative humidity

78%

Average peak wind

8.5km/h

Seasonal range

2.0°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

205 d/yr

Rainy days (≥ 1 mm)

232 d/yr

Annual snowfall

0.0 cm

Average feels-like high

35.5 °C

Average feels-like low

25.4 °C

Average peak gust

25.2 km/h

Tropical nights (≥ 20 °C)

342 d/yr

Solar radiation

19.5 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.4 °C

since 1940

+0.3 °C per decade · r² = 0.83 · 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

37.4 °C

22 March 2024

Coldest day

14.4 °C

16 January 1956

Wettest day

245 mm

5 July 2021

Windiest day

27.3 km/h

11 July 1942

Strongest gust

59.8 km/h

1 November 1961

Hottest feels-like

43.3 °C

12 May 2024

Coldest feels-like

13.1 °C

25 December 1940

Sunniest day

12.6 h

10 July 1943

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	35.8 °C13 May 2025	19.5 °C18 January 2025	27.1 °C	2,158 mm	343
2024	37.4 °C22 March 2024	19.4 °C8 February 2024	27.4 °C	2,973 mm	333
2023	36.5 °C16 April 2023	19.3 °C6 January 2023	27.3 °C	2,246 mm	344
2022	35.6 °C15 April 2022	19.5 °C20 December 2022	26.6 °C	3,199 mm	321
2021	35.4 °C14 April 2021	18.7 °C15 February 2021	26.7 °C	2,678 mm	342
2020	37.1 °C8 April 2020	19.6 °C20 December 2020	27.0 °C	2,901 mm	326
2019	36.4 °C7 May 2019	20.0 °C11 February 2019	27.0 °C	2,208 mm	336
2018	35.6 °C11 March 2018	18.4 °C11 January 2018	26.7 °C	2,294 mm	345
2017	36.7 °C30 April 2017	18.9 °C25 January 2017	26.7 °C	2,436 mm	318
2016	35.8 °C12 April 2016	19.2 °C23 December 2016	27.0 °C	2,203 mm	323
2015	35.9 °C11 March 2015	19.3 °C30 January 2015	27.2 °C	1,952 mm	337
2014	35.9 °C29 March 2014	18.6 °C27 December 2014	26.8 °C	2,270 mm	320
2013	36.2 °C1 April 2013	19.0 °C23 December 2013	26.7 °C	2,568 mm	311
2012	35.4 °C4 April 2012	18.3 °C10 December 2012	26.5 °C	2,074 mm	311
2011	35.0 °C29 April 2011	18.3 °C10 January 2011	26.4 °C	2,633 mm	307
2010	36.2 °C3 April 2010	18.0 °C17 December 2010	26.5 °C	2,698 mm	264
2009	35.3 °C13 April 2009	17.7 °C23 December 2009	26.6 °C	2,240 mm	321
2008	33.5 °C29 March 2008	19.1 °C4 January 2008	25.9 °C	2,658 mm	251
2007	34.5 °C27 February 2007	18.2 °C23 December 2007	26.2 °C	2,608 mm	274
2006	34.6 °C24 April 2006	19.2 °C11 March 2006	26.2 °C	2,724 mm	271
2005	34.6 °C27 March 2005	19.3 °C14 January 2005	26.1 °C	3,082 mm	254
2004	34.9 °C10 April 2004	18.8 °C26 January 2004	26.0 °C	2,412 mm	235
2003	36.7 °C27 April 2003	16.8 °C10 December 2003	26.3 °C	2,501 mm	256
2002	35.5 °C5 May 2002	17.9 °C11 January 2002	26.3 °C	2,286 mm	277
2001	34.9 °C10 April 2001	18.8 °C30 March 2001	25.8 °C	2,154 mm	208
2000	34.7 °C12 April 2000	17.1 °C1 January 2000	25.8 °C	2,398 mm	218
1999	34.2 °C14 April 1999	17.0 °C4 December 1999	25.6 °C	2,949 mm	205
1998	36.7 °C23 May 1998	16.4 °C8 December 1998	26.6 °C	2,728 mm	260
1997	34.7 °C29 April 1997	19.6 °C12 January 1997	26.2 °C	2,606 mm	260
1996	35.1 °C25 March 1996	17.3 °C16 January 1996	25.7 °C	2,836 mm	196
1995	33.5 °C29 March 1995	18.9 °C26 November 1995	25.6 °C	3,340 mm	185
1994	34.8 °C5 April 1994	18.9 °C6 January 1994	25.9 °C	2,145 mm	250
1993	34.4 °C24 March 1993	16.8 °C10 January 1993	25.8 °C	2,541 mm	233
1992	35.0 °C10 April 1992	17.4 °C6 February 1992	25.8 °C	2,682 mm	226
1991	35.1 °C17 March 1991	18.2 °C16 January 1991	25.8 °C	2,423 mm	218
1990	34.4 °C30 March 1990	18.5 °C5 January 1990	25.6 °C	2,726 mm	195
1989	35.0 °C10 April 1989	16.5 °C1 March 1989	25.3 °C	2,411 mm	177
1988	34.9 °C30 April 1988	18.4 °C19 December 1988	25.7 °C	2,557 mm	197
1987	35.4 °C27 February 1987	16.7 °C28 January 1987	26.1 °C	2,161 mm	270
1986	34.8 °C13 April 1986	17.5 °C15 March 1986	25.5 °C	1,835 mm	191
1985	33.1 °C8 April 1985	17.4 °C17 January 1985	25.2 °C	2,427 mm	154
1984	34.1 °C14 April 1984	17.4 °C16 November 1984	25.3 °C	2,522 mm	167
1983	36.2 °C11 May 1983	17.2 °C17 February 1983	25.9 °C	2,412 mm	216
1982	34.3 °C19 March 1982	18.2 °C6 March 1982	25.8 °C	2,399 mm	236
1981	34.9 °C2 March 1981	17.9 °C26 January 1981	25.4 °C	2,844 mm	163
1980	35.9 °C29 March 1980	17.9 °C19 December 1980	25.8 °C	2,458 mm	206
1979	34.9 °C13 April 1979	17.8 °C8 January 1979	25.6 °C	3,021 mm	187
1978	35.4 °C13 April 1978	18.0 °C18 January 1978	25.5 °C	2,762 mm	218
1977	35.8 °C12 March 1977	18.0 °C3 January 1977	25.6 °C	2,403 mm	222
1976	34.2 °C12 March 1976	17.6 °C4 February 1976	25.4 °C	2,557 mm	180
1975	34.4 °C27 April 1975	16.7 °C11 January 1975	25.2 °C	3,074 mm	164
1974	33.0 °C13 March 1974	17.9 °C17 February 1974	25.2 °C	2,545 mm	182
1973	35.4 °C3 April 1973	16.9 °C20 December 1973	25.5 °C	2,729 mm	196
1972	34.1 °C7 March 1972	17.7 °C17 February 1972	25.6 °C	2,675 mm	187
1971	34.2 °C27 February 1971	18.1 °C24 December 1971	24.9 °C	2,995 mm	134
1970	35.1 °C1 April 1970	16.6 °C16 January 1970	25.4 °C	2,935 mm	175
1969	35.5 °C7 May 1969	15.7 °C21 January 1969	25.5 °C	3,204 mm	170
1968	33.7 °C9 April 1968	17.5 °C22 February 1968	24.8 °C	3,552 mm	90
1967	34.2 °C14 April 1967	17.1 °C18 March 1967	25.1 °C	2,509 mm	138
1966	33.1 °C30 March 1966	17.9 °C22 December 1966	24.9 °C	2,788 mm	101
1965	32.7 °C6 May 1965	17.2 °C2 March 1965	24.9 °C	2,993 mm	111
1964	34.0 °C15 March 1964	17.1 °C11 December 1964	25.0 °C	2,678 mm	119
1963	33.7 °C21 March 1963	17.8 °C8 February 1963	25.0 °C	2,897 mm	113
1962	32.9 °C31 March 1962	17.5 °C9 January 1962	24.7 °C	2,573 mm	103
1961	33.4 °C20 March 1961	17.1 °C3 December 1961	24.9 °C	2,579 mm	126
1960	33.9 °C22 February 1960	16.6 °C5 February 1960	24.9 °C	3,061 mm	147
1959	34.1 °C30 April 1959	18.5 °C30 November 1959	24.9 °C	2,366 mm	139
1958	35.3 °C8 April 1958	18.1 °C2 March 1958	25.3 °C	2,835 mm	152
1957	35.1 °C5 May 1957	18.0 °C8 January 1957	25.0 °C	2,672 mm	153
1956	33.4 °C6 March 1956	14.4 °C16 January 1956	24.4 °C	2,847 mm	88
1955	34.1 °C27 April 1955	17.5 °C29 December 1955	24.5 °C	3,569 mm	120
1954	33.4 °C24 March 1954	17.1 °C10 December 1954	24.7 °C	3,049 mm	111
1953	34.9 °C2 April 1953	17.6 °C15 January 1953	25.3 °C	2,971 mm	160
1952	34.5 °C2 April 1952	18.7 °C24 January 1952	25.1 °C	2,913 mm	141
1951	34.7 °C12 April 1951	17.6 °C12 January 1951	25.4 °C	2,600 mm	196
1950	31.9 °C19 March 1950	17.2 °C20 December 1950	24.4 °C	3,837 mm	60
1949	33.0 °C14 April 1949	15.8 °C19 November 1949	24.7 °C	3,290 mm	108
1948	33.4 °C4 May 1948	17.9 °C15 January 1948	24.9 °C	3,293 mm	97
1947	33.9 °C17 March 1947	18.9 °C20 February 1947	24.8 °C	3,178 mm	120
1946	33.7 °C26 March 1946	17.3 °C7 December 1946	24.8 °C	3,059 mm	116
1945	34.0 °C15 March 1945	16.9 °C9 December 1945	24.8 °C	3,005 mm	119
1944	34.4 °C7 March 1944	17.7 °C4 January 1944	24.9 °C	2,315 mm	135
1943	33.2 °C15 April 1943	16.6 °C21 December 1943	24.5 °C	2,879 mm	76
1942	36.2 °C21 March 1942	18.3 °C18 December 1942	24.8 °C	3,096 mm	113
1941	34.9 °C28 March 1941	17.5 °C17 January 1941	25.4 °C	2,084 mm	189
1940	34.5 °C6 April 1940	15.0 °C25 December 1940	25.1 °C	2,372 mm	185

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

32.0 °C

+1.7 °C

Hot days (≥ 30 °C)

343 d/yr

+138

Frost days (< 0 °C)

0 d/yr

Annual rainfall

2158 mm

-520 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	32.1 °C	+1.7 °C	35 mm	+15 mm
Feb	32.5 °C	+1.2 °C	27 mm	+8 mm
Mar	33.5 °C	+1.3 °C	27 mm	-13 mm
Apr	32.9 °C	+0.5 °C	179 mm	+75 mm
May	33.2 °C	+2.2 °C	218 mm	-114 mm
Jun	31.1 °C	+1.5 °C	418 mm	-13 mm
Jul	32.4 °C	+2.6 °C	203 mm	-134 mm
Aug	32.2 °C	+2.5 °C	254 mm	-130 mm
Sep	31.5 °C	+2.3 °C	327 mm	-146 mm
Oct	30.6 °C	+1.6 °C	319 mm	-78 mm
Nov	31.0 °C	+1.7 °C	68 mm	-42 mm
Dec	30.7 °C	+0.9 °C	84 mm	+50 mm

The year's extremes

Hottest day

35.8 °C

13 May 2025

Coldest day

19.5 °C

18 Jan 2025

Wettest day

60.1 mm

8 Apr 2025

Windiest day

19.6 km/h

17 Jun 2025

Strongest gust

47.2 km/h

17 Jun 2025

Hottest feels-like

42.5 °C

13 May 2025

Coldest feels-like

21.1 °C

18 Jan 2025

Sunniest day

12.4 h

19 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 Retalhuleu?

Retalhuleu has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 25.7 °C and it receives 2,678 mm of precipitation per year.

What is the hottest day ever recorded in Retalhuleu?

The hottest day measured in Retalhuleu between 1940 and 2025 was 22 March 2024, reaching 37.4 °C.

What is the coldest day in Retalhuleu?

The coldest day measured in Retalhuleu between 1940 and 2025 was 16 January 1956, at 14.4 °C.

Does it snow in Retalhuleu?

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

Has the climate of Retalhuleu warmed?

Yes: Retalhuleu warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Retalhuleu?

The wettest day measured in Retalhuleu between 1940 and 2025 was 5 July 2021, with 245 mm of rain in 24 hours.

What was the windiest day in Retalhuleu?

The windiest day measured in Retalhuleu between 1940 and 2025 was 11 July 1942, with winds reaching 27.3 km/h.

What is the warmest month in Retalhuleu?

The warmest month in Retalhuleu is April (27.0 °C on average); the coldest is December (25.0 °C).

How much does it rain in Retalhuleu?

Retalhuleu receives on average 2,678 mm of precipitation per year, spread over about 232 rainy days.

Is it sunny in Retalhuleu?

Retalhuleu gets on average 10.3 hours of sunshine per day, roughly 3,760 hours per year over 1940-2025.

Are there tropical nights in Retalhuleu?

Yes: Retalhuleu has on average 342 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Retalhuleu?

In Retalhuleu, between 1940 and 2025, the highest apparent temperature reached 43.3 °C on 12 May 2024, and the lowest was 13.1 °C on 25 December 1940.

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