Arroio Grande climate — normals and trends

Q: What is the climate of Arroio Grande?

Arroio Grande has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 17.9 °C and it receives 1,279 mm of precipitation per year.

Q: What is the hottest day ever recorded in Arroio Grande?

The hottest day measured in Arroio Grande between 1940 and 2025 was 10 January 2006, reaching 37.8 °C.

Q: What is the coldest day in Arroio Grande?

The coldest day measured in Arroio Grande between 1940 and 2025 was 9 June 2012, at -0.1 °C.

Q: Does it snow in Arroio Grande?

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

Q: Has the climate of Arroio Grande warmed?

Yes: Arroio Grande warmed by +0.6 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Arroio Grande?

The wettest day measured in Arroio Grande between 1940 and 2025 was 6 January 1961, with 122 mm of rain in 24 hours.

Q: What was the windiest day in Arroio Grande?

The windiest day measured in Arroio Grande between 1940 and 2025 was 27 October 2016, with winds reaching 57.8 km/h.

Q: What is the warmest month in Arroio Grande?

The warmest month in Arroio Grande is January (23.3 °C on average); the coldest is July (12.5 °C).

Q: How much does it rain in Arroio Grande?

Arroio Grande receives on average 1,279 mm of precipitation per year, spread over about 119 rainy days.

Q: Is it sunny in Arroio Grande?

Arroio Grande gets on average 9.2 hours of sunshine per day, roughly 3,358 hours per year over 1940-2025.

Arroio Grande (Brazil) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 17.9 °C and it receives 1,279 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 (23.3 °C on average) and the coldest is July (12.5 °C). Rainfall peaks in September.

Arroio Grande averages 0 frost days, 18 hot days (≥ 30 °C) and 119 rainy days per year.

Arroio Grande has warmed by +0.6 °C between 1940 and 2025, or +0.07 °C per decade. This trend is statistically significant.

The hottest day of the period reached 37.8 °C (on 10 January 2006) and the coldest -0.1 °C (on 9 June 2012).

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

Arroio GrandeRio Grande do Sul

coords: -32.24°, -53.09°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJanuaryColdest monthJulyWettest monthSeptemberDriest monthDecember

Mean daily temperature

17.9°C

Average daily high

21.9°C

Average daily low

14.5°C

Annual rainfall

1,279mm

Sunshine / day

9.2h

Mean relative humidity

79%

Average peak wind

20.3km/h

Seasonal range

10.8°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

18 d/yr

Rainy days (≥ 1 mm)

119 d/yr

Annual snowfall

0.0 cm

Average feels-like high

22.2 °C

Average feels-like low

13.5 °C

Average peak gust

35.0 km/h

Tropical nights (≥ 20 °C)

48 d/yr

Solar radiation

16.4 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+0.6 °C

since 1940

+0.1 °C per decade · r² = 0.17 · 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

37.8 °C

10 January 2006

Coldest day

-0.1 °C

9 June 2012

Wettest day

122 mm

6 January 1961

Windiest day

57.8 km/h

27 October 2016

Strongest gust

100.4 km/h

27 October 2016

Hottest feels-like

43.8 °C

10 January 2006

Coldest feels-like

-4.3 °C

1 July 2025

Sunniest day

14.1 h

22 December 1955

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	35.4 °C25 February 2025	1.4 °C1 July 2025	18.1 °C	1,427 mm	32	0
2024	32.6 °C8 February 2024	2.1 °C6 July 2024	18.3 °C	1,863 mm	16	0
2023	36.1 °C13 February 2023	3.0 °C28 August 2023	18.5 °C	1,680 mm	40	0
2022	36.9 °C14 January 2022	3.6 °C20 June 2022	17.8 °C	1,175 mm	33	0
2021	34.2 °C11 January 2021	2.8 °C12 August 2021	18.2 °C	1,193 mm	16	0
2020	34.9 °C14 March 2020	2.1 °C15 July 2020	18.2 °C	889 mm	28	0
2019	34.2 °C28 January 2019	2.3 °C7 July 2019	18.6 °C	1,589 mm	35	0
2018	34.6 °C9 February 2018	3.7 °C22 July 2018	18.5 °C	1,173 mm	32	0
2017	33.6 °C15 November 2017	3.1 °C18 July 2017	19.1 °C	1,229 mm	33	0
2016	33.0 °C18 December 2016	4.1 °C9 June 2016	17.8 °C	1,322 mm	29	0
2015	32.9 °C27 January 2015	3.0 °C19 June 2015	18.5 °C	1,458 mm	15	0
2014	35.5 °C23 January 2014	1.9 °C27 July 2014	18.7 °C	1,638 mm	37	0
2013	37.6 °C26 December 2013	2.3 °C25 July 2013	17.7 °C	1,234 mm	21	0
2012	35.2 °C25 December 2012	-0.1 °C9 June 2012	18.6 °C	982 mm	40	1
2011	33.7 °C16 January 2011	2.3 °C7 July 2011	17.8 °C	1,128 mm	21	0
2010	34.6 °C3 February 2010	2.8 °C16 July 2010	18.1 °C	1,229 mm	23	0
2009	33.0 °C10 February 2009	1.4 °C29 July 2009	17.8 °C	1,296 mm	13	0
2008	34.7 °C10 January 2008	2.9 °C9 August 2008	18.0 °C	1,016 mm	17	0
2007	35.4 °C10 December 2007	0.4 °C12 July 2007	17.9 °C	1,248 mm	31	0
2006	37.8 °C10 January 2006	3.7 °C31 July 2006	18.4 °C	1,097 mm	30	0
2005	34.6 °C8 March 2005	2.9 °C20 July 2005	18.5 °C	1,180 mm	34	0
2004	33.5 °C13 April 2004	3.3 °C14 June 2004	18.1 °C	1,056 mm	22	0
2003	34.8 °C31 January 2003	2.1 °C26 August 2003	17.7 °C	1,179 mm	14	0
2002	33.4 °C29 January 2002	2.5 °C11 July 2002	18.2 °C	2,171 mm	18	0
2001	33.3 °C7 February 2001	3.6 °C28 July 2001	18.6 °C	1,593 mm	17	0
2000	35.6 °C21 January 2000	1.3 °C14 July 2000	17.7 °C	1,375 mm	21	0
1999	35.8 °C27 December 1999	3.7 °C14 August 1999	17.5 °C	1,137 mm	18	0
1998	33.6 °C21 January 1998	4.7 °C27 June 1998	17.6 °C	1,848 mm	13	0
1997	35.6 °C7 January 1997	1.4 °C28 June 1997	18.1 °C	1,533 mm	19	0
1996	33.6 °C29 December 1996	0.1 °C30 June 1996	17.6 °C	1,179 mm	11	0
1995	36.3 °C18 December 1995	2.8 °C5 August 1995	17.7 °C	1,432 mm	21	0
1994	35.9 °C12 December 1994	1.7 °C28 June 1994	18.0 °C	1,507 mm	21	0
1993	33.8 °C24 January 1993	1.7 °C16 July 1993	17.8 °C	1,308 mm	18	0
1992	33.5 °C20 February 1992	1.9 °C16 July 1992	17.6 °C	1,408 mm	12	0
1991	35.6 °C27 February 1991	0.8 °C15 July 1991	18.1 °C	1,063 mm	21	0
1990	35.3 °C30 January 1990	2.1 °C29 August 1990	17.7 °C	1,474 mm	29	0
1989	33.2 °C6 February 1989	3.1 °C3 July 1989	18.1 °C	836 mm	25	0
1988	33.0 °C25 December 1988	1.7 °C11 July 1988	17.1 °C	1,089 mm	20	0
1987	34.6 °C26 February 1987	2.6 °C24 June 1987	17.7 °C	1,546 mm	22	0
1986	34.3 °C12 January 1986	2.6 °C22 July 1986	18.4 °C	1,414 mm	24	0
1985	34.2 °C13 November 1985	3.4 °C12 July 1985	18.3 °C	1,283 mm	22	0
1984	34.3 °C7 January 1984	2.9 °C29 July 1984	17.6 °C	1,775 mm	18	0
1983	33.3 °C28 December 1983	2.1 °C12 July 1983	17.5 °C	1,478 mm	18	0
1982	32.9 °C27 December 1982	3.9 °C16 June 1982	18.0 °C	1,431 mm	14	0
1981	32.4 °C27 February 1981	2.7 °C21 June 1981	18.0 °C	1,148 mm	10	0
1980	35.1 °C23 January 1980	1.4 °C31 July 1980	18.1 °C	1,583 mm	18	0
1979	32.3 °C25 January 1979	3.7 °C16 June 1979	17.3 °C	1,172 mm	9	0
1978	33.8 °C19 January 1978	3.5 °C31 August 1978	17.8 °C	1,239 mm	16	0
1977	32.4 °C7 March 1977	4.5 °C19 July 1977	18.5 °C	2,115 mm	12	0
1976	33.6 °C1 January 1976	2.6 °C15 August 1976	17.2 °C	1,259 mm	11	0
1975	35.9 °C26 January 1975	2.0 °C19 July 1975	17.9 °C	1,022 mm	22	0
1974	34.2 °C19 January 1974	3.4 °C3 September 1974	17.6 °C	1,372 mm	13	0
1973	35.9 °C5 January 1973	5.2 °C19 July 1973	17.9 °C	1,331 mm	16	0
1972	33.6 °C6 February 1972	1.8 °C14 July 1972	18.0 °C	1,575 mm	16	0
1971	35.2 °C29 December 1971	2.0 °C17 June 1971	17.7 °C	995 mm	22	0
1970	33.9 °C27 February 1970	3.3 °C2 July 1970	18.1 °C	1,281 mm	20	0
1969	32.9 °C31 January 1969	2.2 °C19 June 1969	17.9 °C	1,180 mm	15	0
1968	34.1 °C11 December 1968	3.3 °C3 September 1968	17.8 °C	1,162 mm	28	0
1967	33.2 °C17 January 1967	0.9 °C14 June 1967	18.0 °C	1,518 mm	18	0
1966	31.2 °C17 March 1966	3.1 °C2 July 1966	17.1 °C	1,353 mm	6	0
1965	33.7 °C18 February 1965	2.2 °C12 July 1965	17.6 °C	1,043 mm	34	0
1964	34.8 °C26 January 1964	2.6 °C25 June 1964	16.9 °C	1,070 mm	15	0
1963	32.2 °C2 January 1963	2.9 °C23 July 1963	17.8 °C	1,705 mm	13	0
1962	35.1 °C29 December 1962	4.1 °C20 July 1962	17.2 °C	905 mm	13	0
1961	32.2 °C20 January 1961	2.7 °C14 June 1961	17.9 °C	1,383 mm	10	0
1960	33.0 °C12 February 1960	1.7 °C25 June 1960	17.3 °C	992 mm	19	0
1959	31.8 °C2 March 1959	3.8 °C13 June 1959	17.3 °C	1,554 mm	8	0
1958	33.7 °C7 January 1958	4.4 °C19 June 1958	17.7 °C	1,080 mm	3	0
1957	33.5 °C11 January 1957	2.0 °C3 August 1957	17.6 °C	1,324 mm	9	0
1956	32.3 °C4 January 1956	3.2 °C21 July 1956	17.2 °C	886 mm	6	0
1955	32.6 °C17 January 1955	1.7 °C8 July 1955	17.1 °C	1,031 mm	6	0
1954	32.1 °C21 January 1954	4.5 °C19 July 1954	17.8 °C	1,255 mm	13	0
1953	35.8 °C5 January 1953	3.1 °C20 July 1953	18.2 °C	1,094 mm	21	0
1952	35.3 °C27 December 1952	5.3 °C1 July 1952	17.7 °C	1,069 mm	14	0
1951	31.7 °C4 February 1951	3.1 °C4 August 1951	17.7 °C	1,167 mm	10	0
1950	33.9 °C30 January 1950	3.4 °C12 July 1950	17.5 °C	1,106 mm	11	0
1949	34.6 °C20 December 1949	1.0 °C18 July 1949	17.3 °C	933 mm	14	0
1948	32.8 °C12 December 1948	0.8 °C9 August 1948	17.8 °C	1,140 mm	6	0
1947	32.5 °C22 January 1947	2.0 °C11 July 1947	17.7 °C	1,054 mm	8	0
1946	33.7 °C13 February 1946	3.9 °C16 August 1946	17.7 °C	1,196 mm	12	0
1945	35.5 °C15 January 1945	1.6 °C9 July 1945	18.3 °C	943 mm	11	0
1944	34.2 °C13 February 1944	5.9 °C8 September 1944	18.8 °C	1,026 mm	11	0
1943	35.5 °C1 January 1943	3.8 °C29 August 1943	18.7 °C	837 mm	24	0
1942	32.6 °C21 December 1942	2.5 °C20 June 1942	17.6 °C	1,061 mm	16	0
1941	33.9 °C16 February 1941	3.3 °C29 June 1941	17.6 °C	1,312 mm	8	0
1940	33.8 °C22 March 1940	3.8 °C3 August 1940	17.7 °C	1,366 mm	7	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

22.3 °C

+0.4 °C

Hot days (≥ 30 °C)

32 d/yr

+14

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1428 mm

+149 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	27.4 °C	-0.2 °C	132 mm	+19 mm
Feb	29.3 °C	+2.2 °C	89 mm	-18 mm
Mar	27.2 °C	+1.5 °C	126 mm	+25 mm
Apr	21.8 °C	-1.0 °C	123 mm	+24 mm
May	20.6 °C	+1.2 °C	164 mm	+63 mm
Jun	15.0 °C	-1.8 °C	112 mm	+2 mm
Jul	14.9 °C	-1.4 °C	123 mm	+14 mm
Aug	17.2 °C	-0.2 °C	124 mm	+13 mm
Sep	19.6 °C	+1.0 °C	126 mm	+1 mm
Oct	22.8 °C	+1.7 °C	66 mm	-54 mm
Nov	24.3 °C	+0.7 °C	80 mm	-16 mm
Dec	28.3 °C	+2.1 °C	163 mm	+76 mm

The year's extremes

Hottest day

35.4 °C

25 Feb 2025

Coldest day

1.4 °C

1 Jul 2025

Wettest day

66.7 mm

20 Jan 2025

Windiest day

45.8 km/h

23 Jun 2025

Strongest gust

76.0 km/h

23 Jun 2025

Hottest feels-like

42.3 °C

4 Feb 2025

Coldest feels-like

-4.3 °C

1 Jul 2025

Sunniest day

14.0 h

17 Dec 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 Arroio Grande?

Arroio Grande has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 17.9 °C and it receives 1,279 mm of precipitation per year.

What is the hottest day ever recorded in Arroio Grande?

The hottest day measured in Arroio Grande between 1940 and 2025 was 10 January 2006, reaching 37.8 °C.

What is the coldest day in Arroio Grande?

The coldest day measured in Arroio Grande between 1940 and 2025 was 9 June 2012, at -0.1 °C.

Does it snow in Arroio Grande?

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

Has the climate of Arroio Grande warmed?

Yes: Arroio Grande warmed by +0.6 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Arroio Grande?

The wettest day measured in Arroio Grande between 1940 and 2025 was 6 January 1961, with 122 mm of rain in 24 hours.

What was the windiest day in Arroio Grande?

The windiest day measured in Arroio Grande between 1940 and 2025 was 27 October 2016, with winds reaching 57.8 km/h.

What is the warmest month in Arroio Grande?

The warmest month in Arroio Grande is January (23.3 °C on average); the coldest is July (12.5 °C).

How much does it rain in Arroio Grande?

Arroio Grande receives on average 1,279 mm of precipitation per year, spread over about 119 rainy days.

Is it sunny in Arroio Grande?

Arroio Grande gets on average 9.2 hours of sunshine per day, roughly 3,358 hours per year over 1940-2025.

Are there tropical nights in Arroio Grande?

Yes: Arroio Grande has on average 48 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Arroio Grande?

In Arroio Grande, between 1940 and 2025, the highest apparent temperature reached 43.8 °C on 10 January 2006, and the lowest was -4.3 °C on 1 July 2025.

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