Três Rios climate — normals and trends

Q: What is the climate of Três Rios?

Três Rios has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 21.0 °C and it receives 1,388 mm of precipitation per year.

Q: What is the hottest day ever recorded in Três Rios?

The hottest day measured in Três Rios between 1940 and 2025 was 18 November 2023, reaching 37.2 °C.

Q: What is the coldest day in Três Rios?

The coldest day measured in Três Rios between 1940 and 2025 was 1 June 1979, at 3.8 °C.

Q: Does it snow in Três Rios?

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

Q: Has the climate of Três Rios warmed?

Yes: Três Rios warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Três Rios?

The wettest day measured in Três Rios between 1940 and 2025 was 12 February 2004, with 123 mm of rain in 24 hours.

Q: What was the windiest day in Três Rios?

The windiest day measured in Três Rios between 1940 and 2025 was 31 July 1987, with winds reaching 28.8 km/h.

Q: What is the warmest month in Três Rios?

The warmest month in Três Rios is February (23.9 °C on average); the coldest is July (17.5 °C).

Q: How much does it rain in Três Rios?

Três Rios receives on average 1,388 mm of precipitation per year, spread over about 152 rainy days.

Q: Is it sunny in Três Rios?

Três Rios gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.

Três Rios (Brazil) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 21.0 °C and it receives 1,388 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 (23.9 °C on average) and the coldest is July (17.5 °C). Rainfall peaks in December.

Três Rios averages 0 frost days, 54 hot days (≥ 30 °C) and 152 rainy days per year.

Três Rios has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.

The hottest day of the period reached 37.2 °C (on 18 November 2023) and the coldest 3.8 °C (on 1 June 1979).

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

Três RiosRio de Janeiro

coords: -22.12°, -43.21°
period: 1940–2025 · 86 yrs

CwaHumid subtropical, dry winterWarmest monthFebruaryColdest monthJulyWettest monthDecemberDriest monthJuly

Mean daily temperature

21.0°C

Average daily high

26.0°C

Average daily low

17.1°C

Annual rainfall

1,388mm

Sunshine / day

8.9h

Mean relative humidity

79%

Average peak wind

11.4km/h

Seasonal range

6.4°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

54 d/yr

Rainy days (≥ 1 mm)

152 d/yr

Annual snowfall

0.0 cm

Average feels-like high

28.2 °C

Average feels-like low

18.3 °C

Average peak gust

28.7 km/h

Tropical nights (≥ 20 °C)

74 d/yr

Solar radiation

16.5 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.8 °C

since 1940

+0.2 °C per decade · r² = 0.60 · 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

37.2 °C

18 November 2023

Coldest day

3.8 °C

1 June 1979

Wettest day

123 mm

12 February 2004

Windiest day

28.8 km/h

31 July 1987

Strongest gust

71.3 km/h

13 December 1949

Hottest feels-like

42.0 °C

25 December 2017

Coldest feels-like

1.1 °C

1 June 1979

Sunniest day

13.3 h

28 December 2025

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	34.5 °C18 February 2025	6.2 °C31 July 2025	21.3 °C	924 mm	78
2024	34.8 °C20 January 2024	7.6 °C11 August 2024	22.2 °C	1,178 mm	112
2023	37.2 °C18 November 2023	7.5 °C4 July 2023	21.8 °C	1,287 mm	98
2022	35.4 °C10 September 2022	7.6 °C21 May 2022	21.0 °C	1,411 mm	64
2021	35.2 °C21 September 2021	5.1 °C31 July 2021	20.8 °C	1,269 mm	56
2020	35.5 °C2 October 2020	7.2 °C27 May 2020	21.4 °C	1,338 mm	67
2019	34.9 °C18 September 2019	8.2 °C9 July 2019	22.1 °C	922 mm	103
2018	34.1 °C19 January 2018	7.9 °C21 May 2018	21.8 °C	1,259 mm	84
2017	34.9 °C14 October 2017	8.7 °C4 July 2017	21.5 °C	838 mm	76
2016	34.9 °C10 February 2016	5.3 °C14 June 2016	21.8 °C	1,216 mm	110
2015	35.8 °C16 October 2015	10.8 °C27 June 2015	22.4 °C	1,093 mm	126
2014	35.8 °C19 October 2014	8.3 °C6 August 2014	21.9 °C	653 mm	106
2013	35.7 °C12 November 2013	8.4 °C8 July 2013	21.2 °C	1,355 mm	76
2012	35.7 °C19 September 2012	8.4 °C28 September 2012	21.4 °C	1,163 mm	72
2011	33.7 °C20 February 2011	7.8 °C4 September 2011	21.1 °C	1,364 mm	75
2010	34.5 °C16 February 2010	7.6 °C17 August 2010	21.7 °C	1,290 mm	106
2009	33.7 °C15 November 2009	8.7 °C4 June 2009	21.8 °C	1,525 mm	100
2008	34.9 °C27 October 2008	8.0 °C9 July 2008	21.1 °C	1,684 mm	68
2007	35.4 °C24 September 2007	6.1 °C30 July 2007	21.7 °C	1,230 mm	95
2006	35.8 °C25 January 2006	7.3 °C6 September 2006	21.6 °C	982 mm	72
2005	34.2 °C14 October 2005	8.7 °C10 July 2005	21.7 °C	1,318 mm	72
2004	34.8 °C29 September 2004	9.7 °C10 August 2004	21.1 °C	1,724 mm	49
2003	34.9 °C10 January 2003	9.3 °C12 August 2003	21.5 °C	1,295 mm	79
2002	33.7 °C17 October 2002	10.7 °C3 September 2002	22.1 °C	1,303 mm	99
2001	33.4 °C4 October 2001	10.2 °C1 July 2001	21.5 °C	1,064 mm	76
2000	34.5 °C15 January 2000	4.6 °C18 July 2000	20.9 °C	1,207 mm	55
1999	34.2 °C20 January 1999	8.8 °C24 September 1999	20.6 °C	1,066 mm	56
1998	34.9 °C5 February 1998	8.1 °C7 June 1998	21.4 °C	1,217 mm	74
1997	36.1 °C9 September 1997	7.9 °C3 June 1997	21.6 °C	1,410 mm	92
1996	34.2 °C31 January 1996	8.4 °C25 July 1996	21.0 °C	1,556 mm	79
1995	36.7 °C17 January 1995	9.4 °C6 September 1995	21.6 °C	1,568 mm	88
1994	34.8 °C17 February 1994	5.6 °C27 June 1994	21.6 °C	1,458 mm	89
1993	34.9 °C1 November 1993	9.7 °C14 June 1993	21.7 °C	1,088 mm	85
1992	33.2 °C6 April 1992	9.3 °C28 July 1992	21.3 °C	1,497 mm	40
1991	33.6 °C13 December 1991	9.4 °C4 September 1991	21.2 °C	1,496 mm	32
1990	33.6 °C25 January 1990	7.8 °C16 September 1990	21.4 °C	1,025 mm	62
1989	32.2 °C22 February 1989	7.4 °C19 July 1989	20.9 °C	1,394 mm	31
1988	33.7 °C30 January 1988	6.7 °C16 July 1988	21.0 °C	1,500 mm	45
1987	33.8 °C9 January 1987	8.8 °C10 August 1987	21.5 °C	1,587 mm	50
1986	33.1 °C2 February 1986	8.8 °C13 July 1986	21.4 °C	1,313 mm	41
1985	32.8 °C4 February 1985	6.3 °C9 June 1985	20.9 °C	1,666 mm	31
1984	34.3 °C16 January 1984	8.3 °C1 August 1984	21.6 °C	1,172 mm	55
1983	32.4 °C26 February 1983	7.2 °C6 August 1983	21.3 °C	1,800 mm	34
1982	32.4 °C21 November 1982	9.6 °C1 August 1982	21.0 °C	1,533 mm	23
1981	32.8 °C29 September 1981	6.4 °C22 July 1981	20.7 °C	1,334 mm	36
1980	32.7 °C30 October 1980	7.9 °C27 September 1980	21.2 °C	1,077 mm	39
1979	32.9 °C15 December 1979	3.8 °C1 June 1979	20.5 °C	1,700 mm	27
1978	32.2 °C31 January 1978	7.6 °C16 August 1978	20.8 °C	1,220 mm	38
1977	33.2 °C1 March 1977	9.0 °C21 May 1977	21.6 °C	1,289 mm	56
1976	32.9 °C26 January 1976	8.5 °C16 August 1976	20.8 °C	1,486 mm	30
1975	34.0 °C9 December 1975	6.0 °C7 July 1975	20.7 °C	1,610 mm	47
1974	32.8 °C21 February 1974	7.4 °C16 June 1974	20.9 °C	1,126 mm	36
1973	35.9 °C11 February 1973	9.1 °C27 July 1973	21.5 °C	1,402 mm	59
1972	34.1 °C6 January 1972	9.1 °C23 June 1972	21.0 °C	1,419 mm	44
1971	34.1 °C31 January 1971	8.7 °C20 July 1971	20.9 °C	1,206 mm	66
1970	33.2 °C9 January 1970	9.0 °C13 August 1970	20.9 °C	979 mm	41
1969	34.8 °C17 February 1969	9.0 °C6 June 1969	21.0 °C	1,174 mm	63
1968	33.8 °C24 December 1968	8.5 °C18 May 1968	19.9 °C	967 mm	35
1967	34.0 °C12 October 1967	9.1 °C10 June 1967	21.1 °C	1,649 mm	32
1966	34.0 °C5 December 1966	9.2 °C19 September 1966	20.5 °C	1,609 mm	34
1965	32.2 °C21 December 1965	7.4 °C12 July 1965	20.3 °C	1,864 mm	20
1964	32.4 °C19 February 1964	7.6 °C29 July 1964	19.6 °C	1,575 mm	10
1963	35.8 °C15 October 1963	8.9 °C9 August 1963	21.1 °C	782 mm	62
1962	31.0 °C18 February 1962	8.1 °C8 July 1962	19.5 °C	2,192 mm	4
1961	37.1 °C29 September 1961	9.6 °C19 June 1961	21.1 °C	1,441 mm	48
1960	35.4 °C25 September 1960	7.6 °C16 July 1960	19.9 °C	1,682 mm	21
1959	32.2 °C27 February 1959	8.9 °C13 June 1959	20.8 °C	1,227 mm	40
1958	33.5 °C16 November 1958	7.5 °C22 September 1958	20.5 °C	1,068 mm	50
1957	32.9 °C26 October 1957	6.1 °C23 July 1957	20.4 °C	1,544 mm	22
1956	33.8 °C27 January 1956	7.3 °C12 July 1956	19.7 °C	1,080 mm	41
1955	35.4 °C1 October 1955	9.7 °C18 July 1955	20.4 °C	1,018 mm	47
1954	35.9 °C19 September 1954	9.6 °C12 August 1954	20.7 °C	1,866 mm	51
1953	32.1 °C31 January 1953	7.6 °C29 July 1953	20.5 °C	1,605 mm	16
1952	32.6 °C19 September 1952	9.4 °C9 May 1952	20.3 °C	1,897 mm	18
1951	34.2 °C16 November 1951	8.3 °C4 June 1951	20.1 °C	1,210 mm	40
1950	32.5 °C20 February 1950	8.6 °C14 July 1950	20.1 °C	1,633 mm	28
1949	31.8 °C18 March 1949	9.0 °C4 July 1949	19.9 °C	1,830 mm	12
1948	33.2 °C27 January 1948	9.3 °C20 August 1948	20.4 °C	1,081 mm	49
1947	34.0 °C9 January 1947	8.2 °C4 August 1947	20.0 °C	1,604 mm	32
1946	32.2 °C2 November 1946	8.4 °C29 July 1946	20.8 °C	1,680 mm	24
1945	32.7 °C13 November 1945	8.9 °C14 July 1945	20.6 °C	1,588 mm	26
1944	34.2 °C2 October 1944	8.2 °C22 August 1944	20.2 °C	2,081 mm	21
1943	30.2 °C19 January 1943	8.9 °C5 September 1943	19.2 °C	1,731 mm	2
1942	35.5 °C7 October 1942	6.2 °C20 June 1942	19.7 °C	1,300 mm	23
1941	33.7 °C13 January 1941	9.1 °C1 July 1941	20.3 °C	2,225 mm	20
1940	32.7 °C23 August 1940	10.1 °C10 June 1940	20.6 °C	2,057 mm	21

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

26.5 °C

+0.5 °C

Hot days (≥ 30 °C)

78 d/yr

+24

Frost days (< 0 °C)

0 d/yr

Annual rainfall

924 mm

-464 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	29.2 °C	+0.6 °C	243 mm	+6 mm
Feb	31.1 °C	+2.2 °C	7 mm	-165 mm
Mar	28.9 °C	+0.8 °C	185 mm	+29 mm
Apr	26.1 °C	-0.1 °C	64 mm	-8 mm
May	24.5 °C	+0.3 °C	9 mm	-30 mm
Jun	24.1 °C	+0.8 °C	10 mm	-13 mm
Jul	22.7 °C	-0.3 °C	4 mm	-17 mm
Aug	24.3 °C	-0.1 °C	10 mm	-18 mm
Sep	25.3 °C	-0.2 °C	28 mm	-36 mm
Oct	25.7 °C	-0.5 °C	97 mm	-37 mm
Nov	27.0 °C	+0.5 °C	113 mm	-86 mm
Dec	29.9 °C	+2.4 °C	156 mm	-91 mm

The year's extremes

Hottest day

34.5 °C

18 Feb 2025

Coldest day

6.2 °C

31 Jul 2025

Wettest day

79.4 mm

24 Mar 2025

Windiest day

25.3 km/h

10 Dec 2025

Strongest gust

70.9 km/h

10 Dec 2025

Hottest feels-like

40.2 °C

21 Jan 2025

Coldest feels-like

4.2 °C

31 Jul 2025

Sunniest day

13.3 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 Três Rios?

Três Rios has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 21.0 °C and it receives 1,388 mm of precipitation per year.

What is the hottest day ever recorded in Três Rios?

The hottest day measured in Três Rios between 1940 and 2025 was 18 November 2023, reaching 37.2 °C.

What is the coldest day in Três Rios?

The coldest day measured in Três Rios between 1940 and 2025 was 1 June 1979, at 3.8 °C.

Does it snow in Três Rios?

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

Has the climate of Três Rios warmed?

Yes: Três Rios warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Três Rios?

The wettest day measured in Três Rios between 1940 and 2025 was 12 February 2004, with 123 mm of rain in 24 hours.

What was the windiest day in Três Rios?

The windiest day measured in Três Rios between 1940 and 2025 was 31 July 1987, with winds reaching 28.8 km/h.

What is the warmest month in Três Rios?

The warmest month in Três Rios is February (23.9 °C on average); the coldest is July (17.5 °C).

How much does it rain in Três Rios?

Três Rios receives on average 1,388 mm of precipitation per year, spread over about 152 rainy days.

Is it sunny in Três Rios?

Três Rios gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.

Are there tropical nights in Três Rios?

Yes: Três Rios has on average 74 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Três Rios?

In Três Rios, between 1940 and 2025, the highest apparent temperature reached 42.0 °C on 25 December 2017, and the lowest was 1.1 °C on 1 June 1979.

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