Itaboraí climate — normals and trends

Q: What is the climate of Itaboraí?

Itaboraí has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 23.1 °C and it receives 1,763 mm of precipitation per year.

Q: What is the hottest day ever recorded in Itaboraí?

The hottest day measured in Itaboraí between 1940 and 2025 was 18 November 2023, reaching 39.0 °C.

Q: What is the coldest day in Itaboraí?

The coldest day measured in Itaboraí between 1940 and 2025 was 27 June 1994, at 10.0 °C.

Q: Does it snow in Itaboraí?

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

Q: Has the climate of Itaboraí warmed?

Yes: Itaboraí warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Itaboraí?

The wettest day measured in Itaboraí between 1940 and 2025 was 20 January 1975, with 180 mm of rain in 24 hours.

Q: What was the windiest day in Itaboraí?

The windiest day measured in Itaboraí between 1940 and 2025 was 24 September 2007, with winds reaching 29.8 km/h.

Q: What is the warmest month in Itaboraí?

The warmest month in Itaboraí is February (26.2 °C on average); the coldest is July (20.0 °C).

Q: How much does it rain in Itaboraí?

Itaboraí receives on average 1,763 mm of precipitation per year, spread over about 183 rainy days.

Q: Is it sunny in Itaboraí?

Itaboraí gets on average 9.6 hours of sunshine per day, roughly 3,504 hours per year over 1940-2025.

Itaboraí (Brazil) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 23.1 °C and it receives 1,763 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 (26.2 °C on average) and the coldest is July (20.0 °C). Rainfall peaks in January.

Itaboraí averages 0 frost days, 83 hot days (≥ 30 °C) and 183 rainy days per year.

Itaboraí has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.

The hottest day of the period reached 39.0 °C (on 18 November 2023) and the coldest 10.0 °C (on 27 June 1994).

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

ItaboraíRio de Janeiro

coords: -22.74°, -42.86°
period: 1940–2025 · 86 yrs

AmTropical monsoonWarmest monthFebruaryColdest monthJulyWettest monthJanuaryDriest monthJuly

Mean daily temperature

23.1°C

Average daily high

27.0°C

Average daily low

20.0°C

Annual rainfall

1,763mm

Sunshine / day

9.6h

Mean relative humidity

81%

Average peak wind

10.9km/h

Seasonal range

6.2°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

83 d/yr

Rainy days (≥ 1 mm)

183 d/yr

Annual snowfall

0.0 cm

Average feels-like high

30.8 °C

Average feels-like low

22.4 °C

Average peak gust

27.2 km/h

Tropical nights (≥ 20 °C)

186 d/yr

Solar radiation

17.1 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.6 °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

39.0 °C

18 November 2023

Coldest day

10.0 °C

27 June 1994

Wettest day

180 mm

20 January 1975

Windiest day

29.8 km/h

24 September 2007

Strongest gust

69.5 km/h

24 September 2007

Hottest feels-like

47.2 °C

18 November 2023

Coldest feels-like

8.2 °C

1 June 1979

Sunniest day

13.4 h

28 December 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	37.1 °C17 February 2025	12.5 °C14 June 2025	23.3 °C	1,027 mm	109
2024	37.1 °C28 November 2024	11.6 °C11 August 2024	24.0 °C	1,552 mm	127
2023	39.0 °C18 November 2023	12.8 °C4 July 2023	23.8 °C	1,522 mm	125
2022	36.3 °C27 January 2022	11.8 °C28 June 2022	23.0 °C	1,706 mm	93
2021	36.6 °C28 January 2021	10.8 °C21 July 2021	22.9 °C	1,412 mm	93
2020	38.4 °C2 October 2020	12.1 °C27 May 2020	23.3 °C	1,678 mm	85
2019	37.2 °C5 November 2019	12.6 °C19 July 2019	24.2 °C	1,441 mm	125
2018	36.5 °C18 January 2018	13.4 °C21 May 2018	23.8 °C	1,650 mm	108
2017	35.2 °C25 January 2017	13.3 °C4 July 2017	23.7 °C	1,246 mm	112
2016	37.0 °C10 February 2016	10.8 °C13 June 2016	23.8 °C	1,459 mm	135
2015	37.0 °C15 December 2015	14.1 °C5 August 2015	24.4 °C	1,523 mm	140
2014	36.3 °C3 January 2014	12.9 °C6 August 2014	23.8 °C	1,229 mm	126
2013	38.8 °C12 November 2013	12.9 °C16 August 2013	23.3 °C	1,840 mm	94
2012	37.7 °C19 September 2012	12.1 °C10 July 2012	23.6 °C	1,286 mm	111
2011	35.9 °C10 February 2011	11.2 °C4 September 2011	22.9 °C	1,532 mm	89
2010	37.4 °C14 March 2010	12.5 °C17 August 2010	23.7 °C	1,601 mm	120
2009	36.4 °C3 December 2009	11.4 °C4 June 2009	23.7 °C	2,074 mm	105
2008	35.7 °C19 January 2008	13.6 °C15 July 2008	22.9 °C	2,097 mm	76
2007	37.1 °C1 November 2007	11.5 °C30 July 2007	23.5 °C	1,609 mm	111
2006	36.4 °C21 December 2006	13.1 °C6 September 2006	23.5 °C	1,553 mm	105
2005	37.4 °C14 October 2005	14.8 °C9 July 2005	23.8 °C	1,853 mm	93
2004	35.6 °C5 November 2004	13.9 °C28 July 2004	23.2 °C	1,761 mm	65
2003	36.7 °C16 December 2003	13.7 °C18 August 2003	23.8 °C	1,846 mm	118
2002	36.6 °C1 December 2002	12.5 °C3 September 2002	24.3 °C	1,385 mm	133
2001	35.0 °C15 February 2001	14.3 °C16 August 2001	23.8 °C	1,339 mm	123
2000	34.9 °C15 January 2000	10.3 °C18 July 2000	23.1 °C	1,468 mm	97
1999	35.7 °C2 February 1999	12.5 °C24 September 1999	22.6 °C	1,580 mm	81
1998	36.5 °C5 February 1998	13.8 °C7 June 1998	23.5 °C	1,928 mm	101
1997	37.1 °C9 September 1997	13.5 °C11 August 1997	23.5 °C	1,478 mm	127
1996	36.5 °C18 January 1996	11.9 °C24 July 1996	23.0 °C	1,820 mm	99
1995	38.2 °C17 January 1995	13.5 °C6 September 1995	23.6 °C	1,991 mm	110
1994	36.6 °C17 February 1994	10.0 °C27 June 1994	23.8 °C	2,021 mm	117
1993	36.6 °C17 November 1993	12.6 °C13 August 1993	23.9 °C	1,517 mm	116
1992	36.7 °C22 February 1992	12.9 °C28 July 1992	23.5 °C	1,884 mm	103
1991	35.4 °C27 December 1991	13.5 °C4 September 1991	23.3 °C	1,612 mm	73
1990	35.9 °C16 November 1990	13.3 °C23 May 1990	23.5 °C	1,251 mm	99
1989	34.4 °C22 February 1989	12.8 °C18 July 1989	23.0 °C	1,766 mm	62
1988	35.4 °C30 January 1988	11.4 °C6 June 1988	23.1 °C	2,044 mm	72
1987	35.5 °C9 January 1987	13.3 °C25 August 1987	23.5 °C	1,908 mm	89
1986	35.0 °C19 January 1986	13.4 °C2 September 1986	23.6 °C	1,733 mm	85
1985	35.0 °C4 February 1985	13.3 °C14 June 1985	22.9 °C	2,011 mm	61
1984	35.1 °C13 January 1984	13.2 °C31 July 1984	23.6 °C	1,369 mm	76
1983	34.8 °C26 February 1983	12.6 °C7 August 1983	23.3 °C	2,227 mm	56
1982	34.4 °C20 November 1982	14.2 °C6 May 1982	23.1 °C	1,954 mm	50
1981	36.6 °C29 September 1981	13.1 °C22 July 1981	23.0 °C	1,798 mm	65
1980	34.9 °C27 October 1980	13.1 °C28 June 1980	23.4 °C	1,635 mm	88
1979	34.3 °C15 December 1979	10.2 °C1 June 1979	22.6 °C	1,950 mm	58
1978	35.8 °C31 January 1978	11.2 °C16 August 1978	23.0 °C	1,483 mm	69
1977	35.9 °C1 November 1977	14.2 °C21 May 1977	23.6 °C	1,385 mm	92
1976	35.2 °C20 January 1976	11.7 °C16 August 1976	22.9 °C	1,782 mm	70
1975	35.0 °C9 December 1975	10.9 °C8 July 1975	22.8 °C	2,094 mm	67
1974	35.0 °C26 November 1974	13.2 °C16 June 1974	23.0 °C	1,515 mm	67
1973	35.7 °C12 February 1973	13.3 °C20 June 1973	23.4 °C	2,146 mm	79
1972	35.3 °C6 January 1972	13.2 °C30 July 1972	23.3 °C	1,835 mm	79
1971	35.4 °C25 January 1971	13.1 °C14 September 1971	23.0 °C	1,531 mm	78
1970	34.6 °C9 December 1970	13.5 °C13 August 1970	22.9 °C	1,128 mm	66
1969	37.0 °C9 January 1969	13.5 °C6 June 1969	23.1 °C	1,413 mm	65
1968	37.4 °C24 December 1968	12.0 °C14 July 1968	22.0 °C	1,397 mm	52
1967	34.9 °C14 January 1967	14.0 °C20 July 1967	23.1 °C	2,076 mm	49
1966	35.7 °C5 December 1966	13.3 °C25 September 1966	22.6 °C	2,285 mm	78
1965	34.8 °C21 December 1965	12.1 °C13 July 1965	22.6 °C	2,594 mm	64
1964	33.7 °C17 February 1964	12.5 °C29 July 1964	21.8 °C	2,515 mm	39
1963	36.1 °C1 November 1963	12.8 °C8 August 1963	22.8 °C	1,316 mm	80
1962	33.5 °C18 February 1962	12.2 °C26 August 1962	21.7 °C	2,384 mm	30
1961	37.9 °C28 September 1961	14.8 °C19 June 1961	23.3 °C	2,117 mm	89
1960	36.0 °C23 September 1960	13.5 °C16 July 1960	22.1 °C	2,125 mm	51
1959	34.9 °C28 October 1959	14.1 °C13 June 1959	22.9 °C	1,740 mm	81
1958	35.7 °C16 November 1958	11.7 °C22 September 1958	22.8 °C	1,729 mm	83
1957	35.5 °C25 October 1957	13.0 °C23 July 1957	22.4 °C	1,897 mm	51
1956	37.4 °C27 January 1956	11.7 °C11 August 1956	21.9 °C	1,535 mm	79
1955	34.1 °C14 September 1955	13.4 °C15 August 1955	22.2 °C	1,430 mm	81
1954	37.1 °C22 September 1954	13.1 °C30 August 1954	22.8 °C	2,057 mm	64
1953	35.3 °C30 January 1953	13.6 °C13 July 1953	22.7 °C	1,972 mm	64
1952	35.1 °C1 October 1952	13.5 °C16 July 1952	22.4 °C	2,362 mm	39
1951	38.5 °C23 November 1951	12.0 °C14 August 1951	22.3 °C	1,412 mm	81
1950	34.7 °C20 February 1950	13.1 °C12 July 1950	22.3 °C	2,242 mm	60
1949	33.9 °C6 January 1949	12.3 °C27 August 1949	22.0 °C	1,982 mm	42
1948	36.0 °C27 January 1948	12.0 °C31 August 1948	22.4 °C	1,456 mm	60
1947	36.2 °C11 January 1947	12.0 °C4 August 1947	22.1 °C	2,007 mm	53
1946	34.6 °C19 October 1946	13.5 °C26 July 1946	23.1 °C	2,109 mm	77
1945	35.3 °C13 November 1945	13.6 °C12 July 1945	22.8 °C	1,960 mm	72
1944	35.0 °C2 October 1944	12.8 °C22 August 1944	22.5 °C	2,092 mm	57
1943	33.7 °C19 January 1943	12.8 °C10 August 1943	21.5 °C	2,006 mm	34
1942	36.4 °C7 October 1942	12.0 °C24 June 1942	21.8 °C	1,645 mm	61
1941	35.3 °C12 January 1941	12.6 °C1 July 1941	22.6 °C	2,232 mm	63
1940	34.3 °C23 August 1940	13.9 °C28 September 1940	22.8 °C	2,442 mm	48

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

27.6 °C

+0.6 °C

Hot days (≥ 30 °C)

109 d/yr

+26

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1027 mm

-736 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	30.5 °C	+0.7 °C	179 mm	-95 mm
Feb	32.9 °C	+2.8 °C	28 mm	-193 mm
Mar	29.9 °C	+0.9 °C	121 mm	-113 mm
Apr	27.2 °C	-0.1 °C	170 mm	+42 mm
May	26.5 °C	+1.1 °C	24 mm	-52 mm
Jun	25.7 °C	+1.0 °C	30 mm	-20 mm
Jul	23.2 °C	-1.2 °C	45 mm	-3 mm
Aug	24.8 °C	-0.5 °C	16 mm	-33 mm
Sep	26.2 °C	+0.2 °C	44 mm	-36 mm
Oct	26.7 °C	0.0 °C	117 mm	-11 mm
Nov	27.2 °C	+0.1 °C	107 mm	-102 mm
Dec	30.7 °C	+2.2 °C	147 mm	-119 mm

The year's extremes

Hottest day

37.1 °C

17 Feb 2025

Coldest day

12.5 °C

14 Jun 2025

Wettest day

42.0 mm

5 Apr 2025

Windiest day

27.0 km/h

25 Nov 2025

Strongest gust

55.8 km/h

19 Nov 2025

Hottest feels-like

43.8 °C

17 Feb 2025

Coldest feels-like

12.0 °C

14 Jun 2025

Sunniest day

13.4 h

27 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 Itaboraí?

Itaboraí has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 23.1 °C and it receives 1,763 mm of precipitation per year.

What is the hottest day ever recorded in Itaboraí?

The hottest day measured in Itaboraí between 1940 and 2025 was 18 November 2023, reaching 39.0 °C.

What is the coldest day in Itaboraí?

The coldest day measured in Itaboraí between 1940 and 2025 was 27 June 1994, at 10.0 °C.

Does it snow in Itaboraí?

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

Has the climate of Itaboraí warmed?

Yes: Itaboraí warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Itaboraí?

The wettest day measured in Itaboraí between 1940 and 2025 was 20 January 1975, with 180 mm of rain in 24 hours.

What was the windiest day in Itaboraí?

The windiest day measured in Itaboraí between 1940 and 2025 was 24 September 2007, with winds reaching 29.8 km/h.

What is the warmest month in Itaboraí?

The warmest month in Itaboraí is February (26.2 °C on average); the coldest is July (20.0 °C).

How much does it rain in Itaboraí?

Itaboraí receives on average 1,763 mm of precipitation per year, spread over about 183 rainy days.

Is it sunny in Itaboraí?

Itaboraí gets on average 9.6 hours of sunshine per day, roughly 3,504 hours per year over 1940-2025.

Are there tropical nights in Itaboraí?

Yes: Itaboraí has on average 186 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Itaboraí?

In Itaboraí, between 1940 and 2025, the highest apparent temperature reached 47.2 °C on 18 November 2023, and the lowest was 8.2 °C on 1 June 1979.

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