Rio das Ostras climate — normals and trends

Q: What is the climate of Rio das Ostras?

Rio das Ostras has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 23.3 °C and it receives 1,459 mm of precipitation per year.

Q: What is the hottest day ever recorded in Rio das Ostras?

The hottest day measured in Rio das Ostras between 1940 and 2025 was 18 November 2023, reaching 37.4 °C.

Q: What is the coldest day in Rio das Ostras?

The coldest day measured in Rio das Ostras between 1940 and 2025 was 18 July 2000, at 10.0 °C.

Q: Does it snow in Rio das Ostras?

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

Q: Has the climate of Rio das Ostras warmed?

Yes: Rio das Ostras warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Rio das Ostras?

The wettest day measured in Rio das Ostras between 1940 and 2025 was 8 December 1946, with 171 mm of rain in 24 hours.

Q: What was the windiest day in Rio das Ostras?

The windiest day measured in Rio das Ostras between 1940 and 2025 was 8 October 1985, with winds reaching 37.7 km/h.

Q: What is the warmest month in Rio das Ostras?

The warmest month in Rio das Ostras is February (26.1 °C on average); the coldest is July (20.5 °C).

Q: How much does it rain in Rio das Ostras?

Rio das Ostras receives on average 1,459 mm of precipitation per year, spread over about 157 rainy days.

Q: Is it sunny in Rio das Ostras?

Rio das Ostras gets on average 10.0 hours of sunshine per day, roughly 3,650 hours per year over 1940-2025.

Rio das Ostras (Brazil) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 23.3 °C and it receives 1,459 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 February (26.1 °C on average) and the coldest is July (20.5 °C). Rainfall peaks in December.

Rio das Ostras averages 0 frost days, 71 hot days (≥ 30 °C) and 157 rainy days per year.

Rio das Ostras 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 37.4 °C (on 18 November 2023) and the coldest 10.0 °C (on 18 July 2000).

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

Rio das OstrasRio de Janeiro

coords: -22.53°, -41.95°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthFebruaryColdest monthJulyWettest monthDecemberDriest monthJuly

Mean daily temperature

23.3°C

Average daily high

26.9°C

Average daily low

20.4°C

Annual rainfall

1,459mm

Sunshine / day

10.0h

Mean relative humidity

82%

Average peak wind

15.3km/h

Seasonal range

5.6°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

71 d/yr

Rainy days (≥ 1 mm)

157 d/yr

Annual snowfall

0.0 cm

Average feels-like high

30.1 °C

Average feels-like low

22.5 °C

Average peak gust

33.1 km/h

Tropical nights (≥ 20 °C)

204 d/yr

Solar radiation

17.8 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.5 °C

since 1940

+0.2 °C per decade · r² = 0.54 · 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

18 November 2023

Coldest day

10.0 °C

18 July 2000

Wettest day

171 mm

8 December 1946

Windiest day

37.7 km/h

8 October 1985

Strongest gust

76.3 km/h

12 September 1995

Hottest feels-like

46.1 °C

12 November 2013

Coldest feels-like

9.0 °C

18 July 2000

Sunniest day

13.4 h

1 January 1949

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	35.6 °C17 February 2025	12.8 °C14 June 2025	23.4 °C	986 mm	101
2024	35.5 °C16 January 2024	11.9 °C14 August 2024	24.2 °C	1,393 mm	119
2023	37.4 °C18 November 2023	12.3 °C8 July 2023	23.8 °C	1,157 mm	121
2022	35.5 °C27 January 2022	12.2 °C31 August 2022	23.3 °C	1,476 mm	101
2021	35.1 °C5 March 2021	11.6 °C2 July 2021	23.0 °C	1,120 mm	80
2020	36.3 °C2 October 2020	12.9 °C3 August 2020	23.4 °C	1,874 mm	74
2019	36.3 °C5 November 2019	11.9 °C12 July 2019	24.4 °C	1,356 mm	127
2018	35.4 °C18 January 2018	13.2 °C22 May 2018	24.1 °C	1,480 mm	109
2017	34.8 °C5 January 2017	13.6 °C4 July 2017	23.9 °C	933 mm	117
2016	35.5 °C10 February 2016	11.4 °C15 June 2016	24.2 °C	1,182 mm	144
2015	35.3 °C28 December 2015	14.3 °C5 August 2015	24.6 °C	1,040 mm	141
2014	34.0 °C3 January 2014	11.8 °C8 August 2014	23.8 °C	938 mm	112
2013	36.8 °C12 November 2013	12.6 °C8 July 2013	23.6 °C	1,515 mm	90
2012	35.6 °C26 December 2012	12.7 °C29 September 2012	23.6 °C	1,153 mm	89
2011	34.5 °C10 February 2011	11.9 °C6 June 2011	23.1 °C	1,268 mm	71
2010	36.7 °C14 March 2010	12.8 °C8 June 2010	24.0 °C	1,303 mm	120
2009	36.2 °C3 December 2009	11.5 °C4 June 2009	23.9 °C	1,704 mm	95
2008	36.3 °C19 January 2008	13.9 °C18 July 2008	23.1 °C	1,960 mm	74
2007	35.9 °C1 November 2007	12.2 °C31 July 2007	23.7 °C	1,396 mm	95
2006	35.5 °C21 December 2006	14.5 °C6 September 2006	23.7 °C	1,147 mm	98
2005	35.1 °C14 October 2005	15.6 °C9 July 2005	24.0 °C	1,568 mm	82
2004	33.9 °C3 February 2004	14.0 °C11 August 2004	23.4 °C	1,554 mm	56
2003	35.3 °C16 December 2003	14.3 °C19 August 2003	23.9 °C	1,453 mm	109
2002	35.0 °C1 December 2002	14.9 °C3 September 2002	24.4 °C	1,166 mm	122
2001	33.7 °C21 July 2001	14.6 °C19 September 2001	23.9 °C	1,122 mm	113
2000	33.5 °C13 January 2000	10.0 °C18 July 2000	23.2 °C	1,123 mm	86
1999	35.1 °C29 March 1999	13.4 °C12 July 1999	22.9 °C	1,112 mm	68
1998	35.4 °C5 February 1998	13.2 °C9 June 1998	23.7 °C	1,440 mm	94
1997	35.9 °C9 September 1997	13.6 °C3 June 1997	23.5 °C	1,323 mm	95
1996	35.8 °C18 January 1996	13.1 °C5 August 1996	23.1 °C	1,400 mm	91
1995	37.1 °C10 January 1995	13.9 °C8 June 1995	23.8 °C	1,590 mm	96
1994	35.5 °C26 February 1994	11.0 °C27 June 1994	23.9 °C	1,454 mm	100
1993	34.7 °C16 December 1993	13.5 °C23 June 1993	24.0 °C	1,207 mm	103
1992	35.4 °C22 February 1992	13.3 °C26 July 1992	23.6 °C	1,465 mm	72
1991	35.0 °C27 December 1991	13.8 °C4 September 1991	23.5 °C	1,493 mm	54
1990	34.6 °C16 November 1990	14.5 °C24 June 1990	23.7 °C	1,012 mm	92
1989	33.5 °C22 February 1989	13.2 °C23 July 1989	23.2 °C	1,507 mm	56
1988	34.5 °C1 April 1988	11.8 °C6 June 1988	23.2 °C	1,660 mm	64
1987	34.7 °C9 January 1987	13.6 °C24 August 1987	23.7 °C	1,594 mm	77
1986	34.2 °C15 April 1986	14.2 °C10 July 1986	23.7 °C	1,197 mm	73
1985	34.3 °C4 February 1985	12.1 °C15 June 1985	23.1 °C	1,598 mm	49
1984	34.8 °C20 January 1984	13.7 °C1 August 1984	23.8 °C	1,216 mm	67
1983	34.2 °C11 March 1983	11.5 °C8 August 1983	23.5 °C	1,952 mm	53
1982	33.3 °C20 November 1982	13.9 °C6 May 1982	23.2 °C	1,521 mm	29
1981	34.2 °C29 September 1981	13.8 °C12 June 1981	23.2 °C	1,412 mm	50
1980	33.7 °C27 October 1980	13.9 °C28 June 1980	23.5 °C	1,271 mm	59
1979	33.3 °C15 December 1979	12.1 °C2 June 1979	22.7 °C	1,677 mm	42
1978	34.0 °C27 November 1978	12.0 °C2 June 1978	23.2 °C	1,158 mm	58
1977	34.3 °C1 November 1977	14.2 °C21 May 1977	23.8 °C	1,150 mm	80
1976	34.2 °C26 January 1976	14.4 °C3 June 1976	23.2 °C	1,439 mm	65
1975	34.0 °C17 January 1975	12.1 °C8 July 1975	22.9 °C	1,715 mm	52
1974	33.4 °C6 November 1974	13.9 °C16 June 1974	23.2 °C	1,139 mm	52
1973	34.8 °C3 March 1973	14.1 °C20 June 1973	23.6 °C	1,651 mm	72
1972	34.8 °C6 January 1972	14.2 °C24 June 1972	23.4 °C	1,414 mm	61
1971	34.5 °C31 January 1971	14.0 °C21 July 1971	23.2 °C	1,335 mm	68
1970	33.5 °C30 January 1970	14.8 °C12 July 1970	23.1 °C	873 mm	54
1969	35.7 °C9 January 1969	13.8 °C19 July 1969	23.2 °C	1,221 mm	54
1968	34.9 °C24 December 1968	13.5 °C19 May 1968	22.1 °C	1,137 mm	42
1967	33.8 °C3 December 1967	13.9 °C10 June 1967	23.3 °C	1,679 mm	37
1966	35.1 °C5 December 1966	13.8 °C24 September 1966	22.8 °C	2,073 mm	68
1965	33.6 °C21 December 1965	13.9 °C12 July 1965	22.8 °C	2,107 mm	40
1964	33.6 °C18 February 1964	13.4 °C23 July 1964	22.0 °C	2,264 mm	28
1963	35.1 °C28 October 1963	13.3 °C13 July 1963	23.0 °C	933 mm	65
1962	33.5 °C18 February 1962	12.8 °C26 August 1962	22.1 °C	2,140 mm	22
1961	34.4 °C28 September 1961	14.8 °C7 August 1961	23.3 °C	1,683 mm	66
1960	34.8 °C24 September 1960	12.8 °C14 July 1960	22.4 °C	1,710 mm	36
1959	33.9 °C26 February 1959	13.4 °C13 June 1959	23.3 °C	1,211 mm	73
1958	34.6 °C13 December 1958	13.6 °C21 September 1958	23.0 °C	1,201 mm	72
1957	34.0 °C26 October 1957	14.1 °C4 August 1957	22.7 °C	1,638 mm	42
1956	36.1 °C27 January 1956	13.4 °C13 August 1956	22.0 °C	1,177 mm	68
1955	34.1 °C16 March 1955	12.9 °C4 August 1955	22.5 °C	1,044 mm	67
1954	34.4 °C22 September 1954	14.3 °C29 July 1954	22.9 °C	1,850 mm	53
1953	33.9 °C31 January 1953	13.8 °C29 July 1953	22.9 °C	1,728 mm	49
1952	34.0 °C6 February 1952	14.7 °C9 July 1952	22.7 °C	2,082 mm	30
1951	35.6 °C19 November 1951	14.1 °C21 June 1951	22.4 °C	1,155 mm	66
1950	33.5 °C20 February 1950	13.6 °C14 July 1950	22.5 °C	1,866 mm	39
1949	32.7 °C6 January 1949	12.9 °C27 August 1949	22.2 °C	1,969 mm	31
1948	35.0 °C27 January 1948	14.3 °C19 August 1948	22.6 °C	1,242 mm	55
1947	35.1 °C15 January 1947	11.8 °C4 August 1947	22.4 °C	1,563 mm	46
1946	33.5 °C2 November 1946	14.4 °C29 July 1946	23.2 °C	1,770 mm	67
1945	34.0 °C13 November 1945	14.1 °C13 July 1945	23.0 °C	1,650 mm	52
1944	33.7 °C26 October 1944	13.9 °C22 August 1944	22.7 °C	1,948 mm	40
1943	32.7 °C20 January 1943	12.8 °C25 July 1943	21.7 °C	1,754 mm	18
1942	34.2 °C7 October 1942	11.5 °C26 June 1942	22.0 °C	1,472 mm	43
1941	34.5 °C13 January 1941	13.1 °C1 July 1941	22.8 °C	2,025 mm	46
1940	33.3 °C23 August 1940	14.2 °C27 September 1940	23.1 °C	1,830 mm	40

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

27.5 °C

+0.6 °C

Hot days (≥ 30 °C)

101 d/yr

+30

Frost days (< 0 °C)

0 d/yr

Annual rainfall

986 mm

-473 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	30.3 °C	+0.8 °C	140 mm	-72 mm
Feb	32.1 °C	+2.3 °C	2 mm	-155 mm
Mar	29.9 °C	+1.0 °C	150 mm	-25 mm
Apr	27.6 °C	+0.3 °C	111 mm	+10 mm
May	26.8 °C	+1.2 °C	21 mm	-40 mm
Jun	26.2 °C	+1.3 °C	26 mm	-13 mm
Jul	24.0 °C	-0.5 °C	25 mm	-11 mm
Aug	25.1 °C	0.0 °C	21 mm	-19 mm
Sep	25.8 °C	+0.2 °C	54 mm	-19 mm
Oct	26.0 °C	-0.3 °C	150 mm	+23 mm
Nov	26.8 °C	0.0 °C	100 mm	-100 mm
Dec	29.8 °C	+1.6 °C	186 mm	-53 mm

The year's extremes

Hottest day

35.6 °C

17 Feb 2025

Coldest day

12.8 °C

14 Jun 2025

Wettest day

43.3 mm

16 Dec 2025

Windiest day

31.5 km/h

19 Nov 2025

Strongest gust

64.4 km/h

19 Nov 2025

Hottest feels-like

43.2 °C

20 Jan 2025

Coldest feels-like

12.4 °C

14 Jun 2025

Sunniest day

13.2 h

28 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 Rio das Ostras?

Rio das Ostras has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 23.3 °C and it receives 1,459 mm of precipitation per year.

What is the hottest day ever recorded in Rio das Ostras?

The hottest day measured in Rio das Ostras between 1940 and 2025 was 18 November 2023, reaching 37.4 °C.

What is the coldest day in Rio das Ostras?

The coldest day measured in Rio das Ostras between 1940 and 2025 was 18 July 2000, at 10.0 °C.

Does it snow in Rio das Ostras?

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

Has the climate of Rio das Ostras warmed?

Yes: Rio das Ostras warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Rio das Ostras?

The wettest day measured in Rio das Ostras between 1940 and 2025 was 8 December 1946, with 171 mm of rain in 24 hours.

What was the windiest day in Rio das Ostras?

The windiest day measured in Rio das Ostras between 1940 and 2025 was 8 October 1985, with winds reaching 37.7 km/h.

What is the warmest month in Rio das Ostras?

The warmest month in Rio das Ostras is February (26.1 °C on average); the coldest is July (20.5 °C).

How much does it rain in Rio das Ostras?

Rio das Ostras receives on average 1,459 mm of precipitation per year, spread over about 157 rainy days.

Is it sunny in Rio das Ostras?

Rio das Ostras gets on average 10.0 hours of sunshine per day, roughly 3,650 hours per year over 1940-2025.

Are there tropical nights in Rio das Ostras?

Yes: Rio das Ostras has on average 204 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Rio das Ostras?

In Rio das Ostras, between 1940 and 2025, the highest apparent temperature reached 46.1 °C on 12 November 2013, and the lowest was 9.0 °C on 18 July 2000.

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