São Sebastião do Caí climate — normals and trends

Q: What is the climate of São Sebastião do Caí?

São Sebastião do Caí has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 18.3 °C and it receives 1,946 mm of precipitation per year.

Q: What is the hottest day ever recorded in São Sebastião do Caí?

The hottest day measured in São Sebastião do Caí between 1940 and 2025 was 16 November 1985, reaching 38.6 °C.

Q: What is the coldest day in São Sebastião do Caí?

The coldest day measured in São Sebastião do Caí between 1940 and 2025 was 14 July 1991, at -3.8 °C.

Q: Does it snow in São Sebastião do Caí?

Almost never: São Sebastião do Caí sees virtually no snow, with about 1 frost days per year.

Q: Has the climate of São Sebastião do Caí warmed?

Yes: São Sebastião do Caí warmed by +0.9 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in São Sebastião do Caí?

The wettest day measured in São Sebastião do Caí between 1940 and 2025 was 23 April 1998, with 107 mm of rain in 24 hours.

Q: What was the windiest day in São Sebastião do Caí?

The windiest day measured in São Sebastião do Caí between 1940 and 2025 was 16 September 1956, with winds reaching 40.1 km/h.

Q: What is the warmest month in São Sebastião do Caí?

The warmest month in São Sebastião do Caí is January (23.1 °C on average); the coldest is July (13.5 °C).

Q: How much does it rain in São Sebastião do Caí?

São Sebastião do Caí receives on average 1,946 mm of precipitation per year, spread over about 161 rainy days.

Q: Is it sunny in São Sebastião do Caí?

São Sebastião do Caí gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.

São Sebastião do Caí (Brazil) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 18.3 °C and it receives 1,946 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 (23.1 °C on average) and the coldest is July (13.5 °C). Rainfall peaks in January.

São Sebastião do Caí averages 1 frost days, 38 hot days (≥ 30 °C) and 161 rainy days per year.

São Sebastião do Caí has warmed by +0.9 °C between 1940 and 2025, or +0.10 °C per decade. This trend is statistically significant.

The hottest day of the period reached 38.6 °C (on 16 November 1985) and the coldest -3.8 °C (on 14 July 1991).

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

São Sebastião do CaíRio Grande do Sul

coords: -29.59°, -51.38°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthJanuaryColdest monthJulyWettest monthJanuaryDriest monthApril

Mean daily temperature

18.3°C

Average daily high

23.4°C

Average daily low

14.1°C

Annual rainfall

1,946mm

Sunshine / day

8.9h

Mean relative humidity

81%

Average peak wind

13.1km/h

Seasonal range

9.6°C

Frost days (< 0 °C)

1 d/yr

Hot days (≥ 30 °C)

38 d/yr

Rainy days (≥ 1 mm)

161 d/yr

Annual snowfall

0.0 cm

Average feels-like high

25.3 °C

Average feels-like low

14.0 °C

Average peak gust

32.0 km/h

Tropical nights (≥ 20 °C)

37 d/yr

Solar radiation

16.0 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+0.9 °C

since 1940

+0.1 °C per decade · r² = 0.22 · 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

38.6 °C

16 November 1985

Coldest day

-3.8 °C

14 July 1991

Wettest day

107 mm

23 April 1998

Windiest day

40.1 km/h

16 September 1956

Strongest gust

106.2 km/h

2 July 1983

Hottest feels-like

44.1 °C

7 February 2010

Coldest feels-like

-7.2 °C

14 July 1991

Snowiest day

0.1 cm

9 July 1994

Sunniest day

13.6 h

7 December 2025

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	36.5 °C11 February 2025	-0.7 °C2 July 2025	18.6 °C	1,946 mm	58	2
2024	35.8 °C12 February 2024	1.6 °C30 June 2024	19.1 °C	2,381 mm	45	0
2023	36.9 °C13 February 2023	-0.1 °C28 August 2023	19.2 °C	2,348 mm	59	1
2022	37.4 °C22 January 2022	1.6 °C20 August 2022	18.1 °C	1,879 mm	55	0
2021	35.3 °C11 January 2021	0.0 °C30 July 2021	18.4 °C	1,328 mm	37	0
2020	36.0 °C14 March 2020	-0.9 °C15 July 2020	18.6 °C	1,480 mm	51	1
2019	36.8 °C28 December 2019	-1.4 °C7 July 2019	19.5 °C	1,759 mm	69	1
2018	36.6 °C11 December 2018	-1.4 °C17 June 2018	18.8 °C	1,756 mm	42	1
2017	34.6 °C10 September 2017	-0.4 °C19 July 2017	19.7 °C	2,147 mm	53	1
2016	35.3 °C24 January 2016	-0.8 °C13 June 2016	18.4 °C	1,644 mm	62	1
2015	34.1 °C6 January 2015	2.4 °C16 June 2015	19.2 °C	2,449 mm	38	0
2014	37.4 °C5 February 2014	-0.9 °C14 August 2014	19.1 °C	2,227 mm	63	3
2013	36.4 °C26 December 2013	-1.1 °C25 July 2013	18.3 °C	1,860 mm	47	1
2012	36.5 °C25 December 2012	-3.6 °C9 June 2012	19.2 °C	1,528 mm	73	3
2011	35.7 °C22 December 2011	-2.0 °C5 July 2011	18.2 °C	2,084 mm	38	4
2010	36.7 °C3 February 2010	1.1 °C4 August 2010	18.3 °C	2,006 mm	43	0
2009	35.0 °C2 November 2009	-3.7 °C25 July 2009	18.1 °C	2,034 mm	44	3
2008	34.2 °C8 December 2008	-1.1 °C31 May 2008	17.9 °C	1,950 mm	34	2
2007	35.3 °C10 December 2007	-2.5 °C12 July 2007	18.6 °C	2,252 mm	63	3
2006	36.5 °C17 December 2006	-0.8 °C22 August 2006	18.7 °C	1,679 mm	56	3
2005	36.5 °C8 March 2005	0.2 °C20 July 2005	19.0 °C	1,775 mm	68	0
2004	35.1 °C7 September 2004	-1.2 °C11 July 2004	18.2 °C	1,605 mm	32	2
2003	35.4 °C4 February 2003	-2.5 °C12 July 2003	18.6 °C	2,114 mm	40	1
2002	35.0 °C10 March 2002	-0.4 °C25 June 2002	19.0 °C	2,558 mm	48	1
2001	34.2 °C7 February 2001	0.6 °C22 June 2001	19.2 °C	2,074 mm	51	0
2000	34.6 °C12 February 2000	-2.5 °C14 July 2000	18.0 °C	2,151 mm	45	2
1999	35.4 °C26 December 1999	2.0 °C7 June 1999	17.8 °C	1,720 mm	38	0
1998	34.1 °C21 January 1998	2.3 °C21 June 1998	18.0 °C	2,769 mm	33	0
1997	34.4 °C26 December 1997	-1.3 °C30 June 1997	18.6 °C	2,526 mm	43	2
1996	34.6 °C11 January 1996	-2.6 °C30 June 1996	18.0 °C	2,241 mm	37	2
1995	37.2 °C18 December 1995	-0.6 °C5 August 1995	18.4 °C	2,014 mm	53	2
1994	37.0 °C12 December 1994	-1.1 °C11 July 1994	18.7 °C	2,126 mm	42	2
1993	34.6 °C24 January 1993	-0.5 °C16 July 1993	18.2 °C	2,166 mm	48	3
1992	34.5 °C20 February 1992	-1.4 °C3 August 1992	18.1 °C	2,204 mm	37	1
1991	34.5 °C15 October 1991	-3.8 °C14 July 1991	18.5 °C	1,818 mm	46	7
1990	34.9 °C15 November 1990	-0.8 °C29 August 1990	18.0 °C	2,240 mm	41	1
1989	33.4 °C7 February 1989	1.0 °C6 July 1989	18.0 °C	1,810 mm	41	0
1988	34.7 °C26 March 1988	-1.4 °C9 July 1988	17.8 °C	1,700 mm	55	6
1987	35.1 °C1 December 1987	-0.8 °C24 June 1987	18.3 °C	2,579 mm	41	2
1986	36.0 °C16 January 1986	1.9 °C14 May 1986	19.1 °C	2,026 mm	47	0
1985	38.6 °C16 November 1985	2.6 °C4 June 1985	19.0 °C	1,928 mm	45	0
1984	35.2 °C8 January 1984	0.7 °C16 May 1984	18.6 °C	2,432 mm	49	0
1983	33.4 °C23 January 1983	0.2 °C9 September 1983	18.2 °C	2,492 mm	37	0
1982	33.7 °C31 January 1982	2.0 °C29 May 1982	18.6 °C	1,834 mm	38	0
1981	33.4 °C18 February 1981	0.6 °C19 June 1981	18.6 °C	1,701 mm	32	0
1980	33.4 °C24 March 1980	-0.6 °C1 August 1980	18.6 °C	1,900 mm	34	1
1979	36.7 °C11 February 1979	1.2 °C20 September 1979	17.7 °C	1,802 mm	47	0
1978	36.4 °C1 February 1978	0.2 °C6 June 1978	18.4 °C	1,609 mm	30	0
1977	34.5 °C16 February 1977	0.9 °C2 September 1977	19.3 °C	2,107 mm	54	0
1976	34.4 °C14 December 1976	-0.1 °C11 July 1976	17.7 °C	2,012 mm	33	1
1975	35.3 °C15 November 1975	-1.0 °C19 July 1975	18.1 °C	2,107 mm	31	2
1974	34.7 °C27 December 1974	-0.3 °C9 August 1974	18.1 °C	1,801 mm	41	1
1973	33.6 °C23 February 1973	1.1 °C19 July 1973	18.3 °C	2,373 mm	37	0
1972	35.5 °C28 December 1972	-0.4 °C14 July 1972	18.4 °C	2,590 mm	32	1
1971	35.3 °C20 December 1971	-2.1 °C17 June 1971	18.0 °C	2,026 mm	44	3
1970	35.4 °C27 December 1970	0.1 °C25 June 1970	18.5 °C	1,964 mm	47	0
1969	34.3 °C4 February 1969	0.6 °C19 June 1969	18.0 °C	1,860 mm	26	0
1968	35.6 °C12 December 1968	-0.9 °C3 September 1968	17.9 °C	1,508 mm	50	1
1967	35.2 °C10 November 1967	-1.9 °C14 June 1967	18.4 °C	2,028 mm	26	2
1966	32.8 °C14 December 1966	-0.9 °C1 July 1966	17.5 °C	2,142 mm	11	1
1965	34.0 °C1 February 1965	-0.9 °C11 July 1965	17.8 °C	1,960 mm	35	3
1964	33.9 °C25 January 1964	-0.4 °C21 July 1964	17.4 °C	1,438 mm	38	1
1963	36.0 °C3 January 1963	0.8 °C7 August 1963	18.3 °C	2,076 mm	31	0
1962	34.0 °C28 November 1962	1.3 °C23 June 1962	17.0 °C	1,215 mm	28	0
1961	33.8 °C3 September 1961	-1.4 °C17 June 1961	18.6 °C	1,877 mm	35	2
1960	32.7 °C24 December 1960	-0.8 °C25 June 1960	17.5 °C	1,693 mm	25	2
1959	31.8 °C26 October 1959	1.0 °C11 June 1959	18.1 °C	2,039 mm	17	0
1958	35.2 °C7 January 1958	1.5 °C30 August 1958	18.0 °C	1,880 mm	20	0
1957	33.6 °C26 December 1957	-1.1 °C3 August 1957	17.9 °C	1,862 mm	18	1
1956	33.4 °C5 February 1956	0.6 °C15 May 1956	17.0 °C	1,681 mm	7	0
1955	33.5 °C29 November 1955	-1.0 °C8 July 1955	17.4 °C	1,918 mm	24	4
1954	32.1 °C23 December 1954	2.6 °C6 July 1954	18.0 °C	2,108 mm	14	0
1953	33.8 °C21 February 1953	2.3 °C31 July 1953	18.6 °C	1,874 mm	25	0
1952	35.3 °C27 December 1952	3.0 °C13 June 1952	18.0 °C	1,528 mm	27	0
1951	32.0 °C25 September 1951	2.6 °C6 July 1951	18.1 °C	1,588 mm	13	0
1950	32.0 °C29 January 1950	-0.1 °C12 July 1950	17.7 °C	1,780 mm	13	1
1949	33.9 °C26 December 1949	-1.0 °C16 August 1949	17.7 °C	1,619 mm	13	1
1948	31.5 °C25 September 1948	-0.9 °C9 August 1948	18.0 °C	2,628 mm	7	1
1947	32.1 °C30 November 1947	0.5 °C11 July 1947	17.8 °C	1,773 mm	10	0
1946	31.3 °C15 February 1946	-0.7 °C19 July 1946	17.9 °C	2,076 mm	9	1
1945	35.1 °C15 January 1945	0.5 °C24 June 1945	18.6 °C	1,502 mm	21	0
1944	33.1 °C2 January 1944	1.0 °C27 June 1944	19.2 °C	1,518 mm	26	0
1943	37.2 °C2 January 1943	0.9 °C24 August 1943	18.7 °C	1,125 mm	50	0
1942	37.5 °C26 November 1942	-1.8 °C19 June 1942	18.2 °C	1,224 mm	47	3
1941	31.9 °C25 November 1941	-0.3 °C19 July 1941	18.2 °C	2,128 mm	11	1
1940	33.4 °C14 January 1940	2.2 °C10 August 1940	18.3 °C	2,060 mm	20	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

23.8 °C

+0.4 °C

Hot days (≥ 30 °C)

58 d/yr

+20

Frost days (< 0 °C)

2 d/yr

Annual rainfall

1946 mm

+0 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	28.5 °C	+0.2 °C	115 mm	-91 mm
Feb	31.1 °C	+3.1 °C	129 mm	-44 mm
Mar	29.3 °C	+2.6 °C	58 mm	-94 mm
Apr	23.2 °C	-0.5 °C	130 mm	-3 mm
May	21.8 °C	+1.3 °C	187 mm	+54 mm
Jun	15.7 °C	-2.8 °C	242 mm	+94 mm
Jul	17.5 °C	-0.9 °C	81 mm	-64 mm
Aug	19.6 °C	-0.3 °C	123 mm	-28 mm
Sep	21.3 °C	+0.1 °C	280 mm	+90 mm
Oct	23.4 °C	+0.2 °C	150 mm	-43 mm
Nov	25.6 °C	+0.2 °C	148 mm	-6 mm
Dec	29.0 °C	+1.5 °C	302 mm	+137 mm

The year's extremes

Hottest day

36.5 °C

11 Feb 2025

Coldest day

-0.7 °C

2 Jul 2025

Wettest day

60.3 mm

21 Sep 2025

Windiest day

32.0 km/h

20 Aug 2025

Strongest gust

69.8 km/h

20 Aug 2025

Hottest feels-like

42.6 °C

3 Mar 2025

Coldest feels-like

-3.7 °C

1 Jul 2025

Sunniest day

13.6 h

7 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 São Sebastião do Caí?

São Sebastião do Caí has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 18.3 °C and it receives 1,946 mm of precipitation per year.

What is the hottest day ever recorded in São Sebastião do Caí?

The hottest day measured in São Sebastião do Caí between 1940 and 2025 was 16 November 1985, reaching 38.6 °C.

What is the coldest day in São Sebastião do Caí?

The coldest day measured in São Sebastião do Caí between 1940 and 2025 was 14 July 1991, at -3.8 °C.

Does it snow in São Sebastião do Caí?

Almost never: São Sebastião do Caí sees virtually no snow, with about 1 frost days per year.

Has the climate of São Sebastião do Caí warmed?

Yes: São Sebastião do Caí warmed by +0.9 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in São Sebastião do Caí?

The wettest day measured in São Sebastião do Caí between 1940 and 2025 was 23 April 1998, with 107 mm of rain in 24 hours.

What was the windiest day in São Sebastião do Caí?

The windiest day measured in São Sebastião do Caí between 1940 and 2025 was 16 September 1956, with winds reaching 40.1 km/h.

What is the warmest month in São Sebastião do Caí?

The warmest month in São Sebastião do Caí is January (23.1 °C on average); the coldest is July (13.5 °C).

How much does it rain in São Sebastião do Caí?

São Sebastião do Caí receives on average 1,946 mm of precipitation per year, spread over about 161 rainy days.

Is it sunny in São Sebastião do Caí?

São Sebastião do Caí gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.

What is the biggest single-day snowfall in São Sebastião do Caí?

The heaviest 24-hour snowfall measured in São Sebastião do Caí between 1940 and 2025 was 9 July 1994, with 0.1 cm.

Are there tropical nights in São Sebastião do Caí?

Yes: São Sebastião do Caí has on average 37 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in São Sebastião do Caí?

In São Sebastião do Caí, between 1940 and 2025, the highest apparent temperature reached 44.1 °C on 7 February 2010, and the lowest was -7.2 °C on 14 July 1991.

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