Gualeguaychú climate — normals and trends

Q: What is the climate of Gualeguaychú?

Gualeguaychú has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 17.9 °C and it receives 1,139 mm of precipitation per year.

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

The hottest day measured in Gualeguaychú between 1940 and 2025 was 14 January 2022, reaching 41.7 °C.

Q: What is the coldest day in Gualeguaychú?

The coldest day measured in Gualeguaychú between 1940 and 2025 was 9 July 2024, at -4.6 °C.

Q: Does it snow in Gualeguaychú?

Almost never: Gualeguaychú sees virtually no snow, with about 2 frost days per year.

Q: Has the climate of Gualeguaychú warmed?

Between 1940 and 2025, no statistically significant temperature trend emerges in Gualeguaychú.

Q: What is the wettest day in Gualeguaychú?

The wettest day measured in Gualeguaychú between 1940 and 2025 was 5 January 2002, with 155 mm of rain in 24 hours.

Q: What was the windiest day in Gualeguaychú?

The windiest day measured in Gualeguaychú between 1940 and 2025 was 29 May 1984, with winds reaching 50.6 km/h.

Q: What is the warmest month in Gualeguaychú?

The warmest month in Gualeguaychú is January (25.0 °C on average); the coldest is July (11.2 °C).

Q: How much does it rain in Gualeguaychú?

Gualeguaychú receives on average 1,139 mm of precipitation per year, spread over about 89 rainy days.

Q: Is it sunny in Gualeguaychú?

Gualeguaychú gets on average 9.5 hours of sunshine per day, roughly 3,468 hours per year over 1940-2025.

Gualeguaychú (Argentina) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 17.9 °C and it receives 1,139 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 January (25.0 °C on average) and the coldest is July (11.2 °C). Rainfall peaks in March.

Gualeguaychú averages 2 frost days, 56 hot days (≥ 30 °C) and 89 rainy days per year.

No statistically significant temperature trend emerges for Gualeguaychú between 1940 and 2025: over this span, year-to-year swings outweigh the climate signal.

The hottest day of the period reached 41.7 °C (on 14 January 2022) and the coldest -4.6 °C (on 9 July 2024).

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

GualeguaychúEntre Rios

coords: -33.01°, -58.52°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJanuaryColdest monthJulyWettest monthMarchDriest monthJune

Mean daily temperature

17.9°C

Average daily high

23.1°C

Average daily low

13.2°C

Annual rainfall

1,139mm

Sunshine / day

9.5h

Mean relative humidity

73%

Average peak wind

18.0km/h

Seasonal range

13.8°C

Frost days (< 0 °C)

2 d/yr

Hot days (≥ 30 °C)

56 d/yr

Rainy days (≥ 1 mm)

89 d/yr

Annual snowfall

0.0 cm

Average feels-like high

23.3 °C

Average feels-like low

12.0 °C

Average peak gust

34.2 km/h

Tropical nights (≥ 20 °C)

44 d/yr

Solar radiation

17.3 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

No clear trend over this period

Over a short window, year-to-year swings outweigh the climate signal. Try 86 years.

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

41.7 °C

14 January 2022

Coldest day

-4.6 °C

9 July 2024

Wettest day

155 mm

5 January 2002

Windiest day

50.6 km/h

29 May 1984

Strongest gust

101.2 km/h

17 October 1982

Hottest feels-like

44.9 °C

26 December 2013

Coldest feels-like

-8.8 °C

9 July 2024

Sunniest day

14.0 h

3 January 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	39.1 °C16 January 2025	-4.2 °C2 July 2025	18.4 °C	964 mm	84	6
2024	37.5 °C7 February 2024	-4.6 °C9 July 2024	18.4 °C	1,016 mm	55	8
2023	40.4 °C12 February 2023	-1.2 °C14 June 2023	19.0 °C	1,064 mm	83	2
2022	41.7 °C14 January 2022	-1.2 °C18 June 2022	17.8 °C	775 mm	71	4
2021	38.9 °C29 December 2021	-0.7 °C11 August 2021	18.4 °C	826 mm	73	3
2020	38.9 °C24 November 2020	-2.6 °C14 July 2020	18.2 °C	627 mm	64	5
2019	37.2 °C10 December 2019	-2.1 °C6 July 2019	18.0 °C	1,264 mm	45	2
2018	37.4 °C11 January 2018	0.1 °C16 June 2018	18.5 °C	1,154 mm	77	0
2017	37.8 °C15 November 2017	-0.2 °C20 June 2017	18.8 °C	1,340 mm	60	1
2016	38.0 °C24 January 2016	1.0 °C17 July 2016	17.8 °C	1,290 mm	66	0
2015	34.4 °C27 January 2015	-2.1 °C19 June 2015	18.4 °C	1,127 mm	50	2
2014	39.1 °C18 January 2014	0.9 °C19 June 2014	18.2 °C	1,534 mm	50	0
2013	40.8 °C26 December 2013	-1.5 °C27 August 2013	18.0 °C	851 mm	64	2
2012	39.2 °C9 January 2012	-1.9 °C7 June 2012	18.4 °C	1,594 mm	73	7
2011	37.5 °C16 January 2011	-1.9 °C4 July 2011	17.7 °C	932 mm	67	5
2010	37.1 °C27 December 2010	-0.7 °C16 July 2010	17.7 °C	1,112 mm	60	3
2009	37.9 °C17 January 2009	-1.2 °C9 July 2009	17.8 °C	1,300 mm	58	5
2008	38.3 °C8 January 2008	-0.2 °C30 May 2008	18.5 °C	624 mm	81	1
2007	35.9 °C21 December 2007	-2.4 °C12 July 2007	17.3 °C	1,412 mm	52	4
2006	39.1 °C9 January 2006	-3.2 °C31 July 2006	18.2 °C	1,307 mm	54	1
2005	38.6 °C7 January 2005	-1.2 °C19 July 2005	17.9 °C	1,019 mm	58	1
2004	36.4 °C27 January 2004	-2.5 °C11 July 2004	18.1 °C	916 mm	69	1
2003	38.7 °C31 January 2003	-1.0 °C12 July 2003	17.6 °C	1,320 mm	46	1
2002	36.6 °C27 February 2002	-1.5 °C13 June 2002	17.9 °C	1,885 mm	45	4
2001	36.0 °C6 January 2001	-1.1 °C28 July 2001	18.3 °C	1,558 mm	58	1
2000	38.4 °C20 January 2000	-0.8 °C23 July 2000	17.7 °C	1,619 mm	66	2
1999	39.5 °C26 December 1999	-0.9 °C5 July 1999	17.6 °C	1,037 mm	60	1
1998	36.2 °C27 December 1998	2.4 °C25 June 1998	17.3 °C	1,100 mm	29	0
1997	36.1 °C6 January 1997	-1.2 °C28 June 1997	18.5 °C	1,328 mm	65	2
1996	39.4 °C3 January 1996	-3.1 °C29 June 1996	18.0 °C	1,105 mm	71	4
1995	38.9 °C18 December 1995	-2.6 °C4 August 1995	17.5 °C	860 mm	66	3
1994	38.1 °C12 December 1994	-1.7 °C10 July 1994	18.1 °C	1,248 mm	60	2
1993	36.1 °C23 January 1993	-1.2 °C15 July 1993	17.3 °C	1,452 mm	48	4
1992	35.9 °C20 February 1992	-2.2 °C7 July 1992	17.3 °C	1,244 mm	43	7
1991	35.9 °C26 February 1991	-2.8 °C14 July 1991	17.6 °C	1,341 mm	34	4
1990	38.5 °C26 January 1990	-3.0 °C22 July 1990	17.7 °C	1,700 mm	38	5
1989	38.7 °C2 January 1989	-1.6 °C3 July 1989	18.3 °C	847 mm	74	1
1988	37.4 °C4 December 1988	-1.2 °C7 July 1988	17.2 °C	877 mm	64	7
1987	37.7 °C1 December 1987	-1.9 °C14 June 1987	17.7 °C	1,109 mm	56	4
1986	38.9 °C25 January 1986	0.3 °C14 May 1986	18.3 °C	1,441 mm	53	0
1985	38.2 °C10 January 1985	0.0 °C6 July 1985	18.1 °C	1,269 mm	68	0
1984	35.5 °C5 January 1984	-1.8 °C28 June 1984	17.2 °C	1,445 mm	40	6
1983	38.1 °C27 December 1983	-0.4 °C10 June 1983	17.5 °C	1,093 mm	56	1
1982	37.4 °C28 December 1982	0.3 °C16 June 1982	18.2 °C	1,071 mm	55	0
1981	35.3 °C18 January 1981	-2.2 °C24 July 1981	17.9 °C	1,361 mm	47	2
1980	38.3 °C22 January 1980	-3.1 °C15 July 1980	18.1 °C	1,300 mm	67	6
1979	37.7 °C4 February 1979	-1.3 °C15 June 1979	17.7 °C	759 mm	61	1
1978	35.3 °C28 December 1978	-1.2 °C9 June 1978	17.4 °C	1,342 mm	36	3
1977	34.3 °C8 January 1977	1.3 °C23 June 1977	17.9 °C	1,355 mm	50	0
1976	37.0 °C1 January 1976	-4.0 °C10 July 1976	16.9 °C	1,301 mm	39	4
1975	38.1 °C18 December 1975	-1.1 °C26 July 1975	17.5 °C	1,152 mm	56	2
1974	36.4 °C19 January 1974	-1.9 °C13 June 1974	17.2 °C	975 mm	35	5
1973	34.6 °C12 January 1973	0.6 °C2 July 1973	17.3 °C	1,336 mm	36	0
1972	36.5 °C11 January 1972	-1.0 °C4 August 1972	17.5 °C	1,256 mm	46	1
1971	38.3 °C30 December 1971	-2.6 °C17 June 1971	17.1 °C	1,235 mm	45	3
1970	37.4 °C27 February 1970	-0.7 °C8 July 1970	17.8 °C	1,177 mm	59	2
1969	37.4 °C17 December 1969	-2.8 °C18 June 1969	18.0 °C	860 mm	57	2
1968	39.6 °C11 December 1968	0.1 °C5 July 1968	17.7 °C	1,261 mm	58	0
1967	37.8 °C27 December 1967	-3.2 °C14 June 1967	17.7 °C	1,673 mm	54	4
1966	35.0 °C4 February 1966	-1.0 °C2 September 1966	17.0 °C	1,124 mm	36	4
1965	38.9 °C17 February 1965	-1.8 °C6 July 1965	17.7 °C	817 mm	73	4
1964	37.3 °C25 January 1964	-2.0 °C24 June 1964	16.6 °C	813 mm	43	5
1963	36.6 °C1 January 1963	-0.5 °C6 August 1963	17.3 °C	1,625 mm	35	1
1962	39.1 °C29 December 1962	-1.0 °C25 July 1962	16.7 °C	759 mm	57	5
1961	35.9 °C20 January 1961	-1.6 °C15 June 1961	17.5 °C	913 mm	42	4
1960	36.4 °C24 February 1960	-0.5 °C9 July 1960	17.7 °C	768 mm	71	4
1959	36.4 °C4 February 1959	1.5 °C18 August 1959	17.3 °C	1,495 mm	48	0
1958	34.4 °C7 January 1958	0.2 °C26 May 1958	17.5 °C	1,257 mm	25	0
1957	40.5 °C11 January 1957	-1.6 °C14 July 1957	17.8 °C	1,115 mm	46	4
1956	39.2 °C4 January 1956	0.4 °C11 June 1956	18.1 °C	790 mm	62	0
1955	38.4 °C5 January 1955	-0.3 °C29 July 1955	17.7 °C	886 mm	60	2
1954	35.8 °C7 December 1954	0.7 °C19 July 1954	17.7 °C	1,006 mm	56	0
1953	37.5 °C11 January 1953	0.1 °C20 July 1953	18.2 °C	1,040 mm	40	0
1952	39.0 °C27 December 1952	0.8 °C30 June 1952	18.1 °C	1,142 mm	65	0
1951	33.5 °C24 January 1951	0.5 °C27 June 1951	18.2 °C	1,430 mm	35	0
1950	38.7 °C29 January 1950	0.6 °C31 July 1950	18.2 °C	756 mm	74	0
1949	37.6 °C25 February 1949	0.7 °C17 July 1949	17.8 °C	912 mm	66	0
1948	35.8 °C12 December 1948	0.3 °C28 July 1948	18.5 °C	993 mm	66	0
1947	39.4 °C1 February 1947	-0.9 °C10 July 1947	18.6 °C	818 mm	67	1
1946	39.5 °C13 February 1946	0.5 °C21 July 1946	18.1 °C	993 mm	65	0
1945	36.9 °C8 January 1945	-2.1 °C9 July 1945	18.5 °C	806 mm	71	3
1944	37.1 °C5 February 1944	1.2 °C21 May 1944	18.8 °C	1,416 mm	56	0
1943	39.0 °C21 January 1943	0.5 °C23 August 1943	19.3 °C	766 mm	79	0
1942	35.1 °C12 January 1942	-0.2 °C19 June 1942	17.5 °C	1,113 mm	50	1
1941	37.1 °C16 February 1941	-0.3 °C18 July 1941	18.0 °C	931 mm	52	1
1940	34.5 °C9 March 1940	1.4 °C2 August 1940	17.5 °C	1,120 mm	51	0

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

24.0 °C

+0.9 °C

Hot days (≥ 30 °C)

84 d/yr

+28

Frost days (< 0 °C)

6 d/yr

Annual rainfall

964 mm

-175 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	32.5 °C	+2.0 °C	94 mm	-18 mm
Feb	30.5 °C	+1.3 °C	122 mm	+13 mm
Mar	27.6 °C	+0.6 °C	133 mm	+11 mm
Apr	22.9 °C	-0.2 °C	49 mm	-57 mm
May	20.9 °C	+1.4 °C	116 mm	+32 mm
Jun	15.3 °C	-1.0 °C	24 mm	-43 mm
Jul	16.5 °C	+0.5 °C	56 mm	-14 mm
Aug	18.4 °C	+0.6 °C	106 mm	+28 mm
Sep	20.7 °C	+0.9 °C	58 mm	-33 mm
Oct	24.7 °C	+2.0 °C	56 mm	-55 mm
Nov	26.7 °C	+0.6 °C	95 mm	+1 mm
Dec	32.0 °C	+2.9 °C	54 mm	-42 mm

The year's extremes

Hottest day

39.1 °C

16 Jan 2025

Coldest day

-4.2 °C

2 Jul 2025

Wettest day

56.4 mm

19 Aug 2025

Windiest day

38.3 km/h

23 Jun 2025

Strongest gust

76.3 km/h

1 Sep 2025

Hottest feels-like

42.7 °C

16 Jan 2025

Coldest feels-like

-7.9 °C

2 Jul 2025

Sunniest day

14.0 h

2 Jan 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 Gualeguaychú?

Gualeguaychú has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 17.9 °C and it receives 1,139 mm of precipitation per year.

What is the hottest day ever recorded in Gualeguaychú?

The hottest day measured in Gualeguaychú between 1940 and 2025 was 14 January 2022, reaching 41.7 °C.

What is the coldest day in Gualeguaychú?

The coldest day measured in Gualeguaychú between 1940 and 2025 was 9 July 2024, at -4.6 °C.

Does it snow in Gualeguaychú?

Almost never: Gualeguaychú sees virtually no snow, with about 2 frost days per year.

Has the climate of Gualeguaychú warmed?

Between 1940 and 2025, no statistically significant temperature trend emerges in Gualeguaychú.

What is the wettest day in Gualeguaychú?

The wettest day measured in Gualeguaychú between 1940 and 2025 was 5 January 2002, with 155 mm of rain in 24 hours.

What was the windiest day in Gualeguaychú?

The windiest day measured in Gualeguaychú between 1940 and 2025 was 29 May 1984, with winds reaching 50.6 km/h.

What is the warmest month in Gualeguaychú?

The warmest month in Gualeguaychú is January (25.0 °C on average); the coldest is July (11.2 °C).

How much does it rain in Gualeguaychú?

Gualeguaychú receives on average 1,139 mm of precipitation per year, spread over about 89 rainy days.

Is it sunny in Gualeguaychú?

Gualeguaychú gets on average 9.5 hours of sunshine per day, roughly 3,468 hours per year over 1940-2025.

Are there tropical nights in Gualeguaychú?

Yes: Gualeguaychú has on average 44 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Gualeguaychú?

In Gualeguaychú, between 1940 and 2025, the highest apparent temperature reached 44.9 °C on 26 December 2013, and the lowest was -8.8 °C on 9 July 2024.

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