São Sebastião climate — normals and trends

Q: What is the climate of São Sebastião?

São Sebastião has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 21.8 °C and it receives 1,278 mm of precipitation per year.

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

The hottest day measured in São Sebastião between 1940 and 2025 was 15 October 1963, reaching 38.0 °C.

Q: What is the coldest day in São Sebastião?

The coldest day measured in São Sebastião between 1940 and 2025 was 10 June 1985, at 4.9 °C.

Q: Does it snow in São Sebastião?

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

Q: Has the climate of São Sebastião warmed?

Yes: São Sebastião warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in São Sebastião?

The wettest day measured in São Sebastião between 1940 and 2025 was 1 February 1979, with 136 mm of rain in 24 hours.

Q: What was the windiest day in São Sebastião?

The windiest day measured in São Sebastião between 1940 and 2025 was 21 January 1977, with winds reaching 30.2 km/h.

Q: What is the warmest month in São Sebastião?

The warmest month in São Sebastião is October (23.6 °C on average); the coldest is July (19.4 °C).

Q: How much does it rain in São Sebastião?

São Sebastião receives on average 1,278 mm of precipitation per year, spread over about 149 rainy days.

Q: Is it sunny in São Sebastião?

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

São Sebastião (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 21.8 °C and it receives 1,278 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 October (23.6 °C on average) and the coldest is July (19.4 °C). Rainfall peaks in December.

São Sebastião averages 0 frost days, 53 hot days (≥ 30 °C) and 149 rainy days per year.

São Sebastião has warmed by +1.5 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.

The hottest day of the period reached 38.0 °C (on 15 October 1963) and the coldest 4.9 °C (on 10 June 1985).

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 SebastiãoFederal District

coords: -15.90°, -47.78°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthOctoberColdest monthJulyWettest monthDecemberDriest monthJuly

Mean daily temperature

21.8°C

Average daily high

27.3°C

Average daily low

17.2°C

Annual rainfall

1,278mm

Sunshine / day

10.3h

Mean relative humidity

69%

Average peak wind

12.8km/h

Seasonal range

4.2°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

53 d/yr

Rainy days (≥ 1 mm)

149 d/yr

Annual snowfall

0.0 cm

Average feels-like high

29.1 °C

Average feels-like low

17.8 °C

Average peak gust

31.1 km/h

Tropical nights (≥ 20 °C)

24 d/yr

Solar radiation

19.4 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.5 °C

since 1940

+0.2 °C per decade · r² = 0.52 · 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

38.0 °C

15 October 1963

Coldest day

4.9 °C

10 June 1985

Wettest day

136 mm

1 February 1979

Windiest day

30.2 km/h

21 January 1977

Strongest gust

74.5 km/h

23 November 1971

Hottest feels-like

40.5 °C

22 October 2015

Coldest feels-like

1.8 °C

19 May 2022

Sunniest day

12.8 h

16 January 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	33.9 °C8 October 2025	10.4 °C12 August 2025	22.4 °C	907 mm	83
2024	36.1 °C5 October 2024	11.0 °C17 June 2024	22.5 °C	1,325 mm	80
2023	35.6 °C14 November 2023	10.7 °C6 July 2023	22.6 °C	893 mm	104
2022	34.0 °C13 September 2022	5.1 °C19 May 2022	21.9 °C	1,052 mm	54
2021	35.8 °C21 September 2021	8.3 °C30 June 2021	22.0 °C	1,173 mm	55
2020	36.8 °C8 October 2020	10.2 °C22 June 2020	22.0 °C	1,125 mm	72
2019	35.4 °C20 September 2019	9.4 °C7 July 2019	23.0 °C	823 mm	103
2018	35.1 °C13 October 2018	11.0 °C26 July 2018	22.3 °C	1,015 mm	80
2017	36.5 °C15 October 2017	9.9 °C1 August 2017	22.5 °C	1,029 mm	75
2016	35.2 °C15 September 2016	11.3 °C18 June 2016	23.2 °C	1,175 mm	127
2015	36.7 °C21 October 2015	11.6 °C4 August 2015	23.0 °C	930 mm	126
2014	35.8 °C15 October 2014	11.1 °C9 August 2014	22.6 °C	1,084 mm	74
2013	34.3 °C23 September 2013	11.2 °C3 August 2013	22.3 °C	1,419 mm	66
2012	35.3 °C30 October 2012	11.0 °C10 August 2012	22.4 °C	1,037 mm	75
2011	34.5 °C11 September 2011	10.3 °C12 July 2011	22.2 °C	1,340 mm	56
2010	34.6 °C5 October 2010	10.2 °C20 August 2010	22.8 °C	1,061 mm	107
2009	33.2 °C17 November 2009	11.3 °C4 June 2009	22.5 °C	1,272 mm	69
2008	36.6 °C28 October 2008	9.1 °C10 July 2008	22.3 °C	1,214 mm	79
2007	35.8 °C29 October 2007	10.8 °C11 June 2007	22.6 °C	749 mm	89
2006	34.0 °C18 September 2006	9.9 °C23 July 2006	21.8 °C	1,522 mm	38
2005	34.8 °C18 October 2005	10.7 °C15 July 2005	22.3 °C	1,272 mm	77
2004	35.0 °C30 September 2004	10.3 °C24 July 2004	22.4 °C	1,393 mm	77
2003	34.7 °C21 October 2003	9.5 °C2 July 2003	22.2 °C	906 mm	67
2002	35.1 °C22 October 2002	11.0 °C29 May 2002	22.9 °C	1,139 mm	108
2001	35.3 °C11 September 2001	11.8 °C16 July 2001	22.3 °C	1,031 mm	68
2000	34.7 °C20 October 2000	9.9 °C18 July 2000	22.3 °C	1,273 mm	65
1999	34.8 °C9 September 1999	12.0 °C21 May 1999	22.2 °C	1,189 mm	71
1998	35.9 °C16 September 1998	10.9 °C8 June 1998	22.9 °C	1,184 mm	118
1997	34.8 °C18 September 1997	9.0 °C9 June 1997	21.9 °C	1,427 mm	73
1996	33.9 °C25 September 1996	11.0 °C30 June 1996	22.1 °C	1,219 mm	69
1995	35.6 °C3 October 1995	9.8 °C9 June 1995	22.2 °C	1,345 mm	72
1994	36.4 °C3 October 1994	8.7 °C10 July 1994	22.5 °C	1,339 mm	84
1993	33.5 °C19 September 1993	10.1 °C26 May 1993	22.3 °C	1,122 mm	73
1992	31.4 °C24 November 1992	11.4 °C23 July 1992	21.6 °C	1,764 mm	13
1991	33.3 °C30 October 1991	10.8 °C24 July 1991	21.8 °C	1,405 mm	39
1990	33.2 °C14 October 1990	11.4 °C20 May 1990	22.4 °C	906 mm	68
1989	32.1 °C13 September 1989	8.5 °C21 July 1989	21.5 °C	1,519 mm	32
1988	34.1 °C28 September 1988	8.7 °C3 August 1988	21.8 °C	1,121 mm	36
1987	34.1 °C18 October 1987	9.3 °C1 August 1987	22.2 °C	1,132 mm	65
1986	33.3 °C9 October 1986	8.4 °C6 June 1986	21.7 °C	883 mm	43
1985	32.9 °C20 September 1985	4.9 °C10 June 1985	21.2 °C	1,261 mm	28
1984	33.4 °C10 October 1984	11.1 °C19 June 1984	21.7 °C	1,081 mm	32
1983	31.9 °C3 September 1983	10.6 °C4 August 1983	21.5 °C	1,658 mm	22
1982	33.2 °C24 November 1982	11.5 °C2 May 1982	21.6 °C	1,254 mm	25
1981	32.5 °C22 September 1981	8.7 °C21 July 1981	21.2 °C	1,503 mm	36
1980	33.3 °C28 October 1980	11.4 °C10 July 1980	21.5 °C	1,508 mm	30
1979	33.0 °C7 October 1979	6.1 °C1 June 1979	21.3 °C	1,692 mm	35
1978	33.2 °C7 October 1978	10.0 °C1 July 1978	21.3 °C	1,373 mm	22
1977	32.6 °C17 September 1977	7.2 °C18 May 1977	21.6 °C	1,277 mm	46
1976	31.6 °C11 August 1976	9.7 °C20 June 1976	21.4 °C	1,282 mm	22
1975	33.8 °C3 October 1975	7.1 °C18 July 1975	21.3 °C	1,007 mm	22
1974	32.7 °C13 September 1974	9.4 °C3 July 1974	21.3 °C	1,183 mm	27
1973	33.7 °C20 September 1973	9.3 °C24 July 1973	22.0 °C	1,410 mm	42
1972	31.8 °C27 September 1972	10.4 °C31 May 1972	21.5 °C	1,337 mm	20
1971	31.6 °C3 January 1971	8.8 °C19 July 1971	21.2 °C	1,304 mm	14
1970	32.3 °C27 September 1970	9.4 °C15 August 1970	21.5 °C	982 mm	26
1969	33.8 °C13 September 1969	10.0 °C10 July 1969	21.7 °C	1,024 mm	47
1968	33.9 °C9 October 1968	8.7 °C15 June 1968	20.6 °C	1,177 mm	20
1967	32.4 °C14 October 1967	7.9 °C22 July 1967	21.2 °C	1,017 mm	22
1966	31.7 °C16 September 1966	11.8 °C7 July 1966	21.0 °C	1,526 mm	15
1965	33.4 °C20 September 1965	10.6 °C27 July 1965	21.0 °C	1,864 mm	31
1964	31.3 °C2 September 1964	9.9 °C7 June 1964	20.7 °C	2,093 mm	12
1963	38.0 °C15 October 1963	10.2 °C10 July 1963	22.1 °C	965 mm	82
1962	34.6 °C13 September 1962	10.8 °C20 June 1962	21.4 °C	1,719 mm	29
1961	36.9 °C26 October 1961	11.7 °C7 August 1961	22.5 °C	1,089 mm	86
1960	36.1 °C26 September 1960	11.0 °C15 July 1960	21.3 °C	1,602 mm	42
1959	32.8 °C12 September 1959	11.7 °C21 June 1959	22.0 °C	1,406 mm	51
1958	36.3 °C23 November 1958	11.4 °C27 June 1958	22.0 °C	1,202 mm	68
1957	34.9 °C21 September 1957	8.9 °C22 July 1957	21.7 °C	1,602 mm	69
1956	34.1 °C26 September 1956	8.2 °C7 June 1956	21.2 °C	1,441 mm	43
1955	35.2 °C3 October 1955	11.8 °C1 August 1955	21.8 °C	1,127 mm	47
1954	34.7 °C17 October 1954	12.9 °C1 August 1954	22.1 °C	947 mm	60
1953	31.9 °C4 September 1953	11.9 °C30 July 1953	21.3 °C	1,476 mm	15
1952	33.0 °C1 October 1952	11.9 °C12 July 1952	21.3 °C	1,584 mm	37
1951	34.0 °C20 November 1951	11.1 °C16 July 1951	21.4 °C	1,191 mm	58
1950	34.6 °C20 September 1950	10.8 °C15 July 1950	21.4 °C	1,220 mm	24
1949	34.7 °C8 October 1949	10.7 °C4 July 1949	21.5 °C	1,209 mm	45
1948	33.8 °C27 September 1948	11.2 °C9 July 1948	21.6 °C	1,079 mm	45
1947	33.4 °C30 August 1947	11.5 °C15 July 1947	21.2 °C	1,587 mm	6
1946	32.6 °C9 September 1946	11.4 °C28 July 1946	21.7 °C	1,202 mm	31
1945	33.4 °C30 September 1945	10.9 °C16 July 1945	21.2 °C	1,643 mm	40
1944	32.7 °C31 August 1944	10.8 °C11 July 1944	20.8 °C	1,638 mm	31
1943	30.3 °C20 September 1943	11.0 °C20 July 1943	20.1 °C	2,139 mm	2
1942	35.4 °C8 October 1942	9.3 °C25 June 1942	21.6 °C	898 mm	64
1941	32.3 °C3 September 1941	12.6 °C12 June 1941	21.5 °C	1,705 mm	24
1940	32.1 °C26 August 1940	11.9 °C10 June 1940	21.0 °C	1,708 mm	6

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

28.1 °C

+0.8 °C

Hot days (≥ 30 °C)

83 d/yr

+30

Frost days (< 0 °C)

0 d/yr

Annual rainfall

907 mm

-372 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	27.2 °C	+0.1 °C	247 mm	+45 mm
Feb	28.7 °C	+1.5 °C	45 mm	-129 mm
Mar	29.3 °C	+2.1 °C	76 mm	-100 mm
Apr	28.0 °C	+1.0 °C	123 mm	+43 mm
May	26.1 °C	-0.2 °C	1 mm	-22 mm
Jun	26.6 °C	+0.8 °C	1 mm	-5 mm
Jul	26.5 °C	+0.6 °C	0 mm	-3 mm
Aug	28.8 °C	+0.7 °C	0 mm	-6 mm
Sep	30.3 °C	+0.4 °C	9 mm	-23 mm
Oct	29.9 °C	+0.7 °C	43 mm	-89 mm
Nov	28.9 °C	+1.5 °C	115 mm	-92 mm
Dec	27.0 °C	+0.1 °C	247 mm	+11 mm

The year's extremes

Hottest day

33.9 °C

8 Oct 2025

Coldest day

10.4 °C

12 Aug 2025

Wettest day

31.2 mm

15 Dec 2025

Windiest day

25.4 km/h

26 Sep 2025

Strongest gust

52.9 km/h

26 Sep 2025

Hottest feels-like

35.7 °C

27 Dec 2025

Coldest feels-like

7.2 °C

12 Aug 2025

Sunniest day

12.8 h

11 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 São Sebastião?

São Sebastião has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 21.8 °C and it receives 1,278 mm of precipitation per year.

What is the hottest day ever recorded in São Sebastião?

The hottest day measured in São Sebastião between 1940 and 2025 was 15 October 1963, reaching 38.0 °C.

What is the coldest day in São Sebastião?

The coldest day measured in São Sebastião between 1940 and 2025 was 10 June 1985, at 4.9 °C.

Does it snow in São Sebastião?

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

Has the climate of São Sebastião warmed?

Yes: São Sebastião warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in São Sebastião?

The wettest day measured in São Sebastião between 1940 and 2025 was 1 February 1979, with 136 mm of rain in 24 hours.

What was the windiest day in São Sebastião?

The windiest day measured in São Sebastião between 1940 and 2025 was 21 January 1977, with winds reaching 30.2 km/h.

What is the warmest month in São Sebastião?

The warmest month in São Sebastião is October (23.6 °C on average); the coldest is July (19.4 °C).

How much does it rain in São Sebastião?

São Sebastião receives on average 1,278 mm of precipitation per year, spread over about 149 rainy days.

Is it sunny in São Sebastião?

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

Are there tropical nights in São Sebastião?

Yes: São Sebastião has on average 24 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in São Sebastião?

In São Sebastião, between 1940 and 2025, the highest apparent temperature reached 40.5 °C on 22 October 2015, and the lowest was 1.8 °C on 19 May 2022.

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