Itaboraí climate

Name: Itaboraí
Address: BR

Itaboraí is warmest in February, with average highs of 31 °C, and coldest in July, when nights average 16 °C. January is the wettest month (250 mm) and August the driest (42 mm). Figures are 1991–2020 climate normals.

Across a full year Itaboraí averages 1,630 mm of rain and 253 days above 25 °C.

Brazil · population 240,040 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month February 31 °C
Coldest month July 16 °C
Driest month August 42 mm
Wettest month January 250 mm
Least cloud August 42 % cloud
Hottest on record November 41 °C
Coldest on record July 8.6 °C

What to expectItaboraí through the year

Itaboraí has a clear annual cycle: average daily highs run from 25 °C in July to 31 °C in February, a swing of 6.6 °C in mean temperature across the year.

Counted across a normal year, 253 days a year reach 25 °C, 96 of them reach 30 °C. The warmest reading in the 1991–2020 record is 41 °C, in November.

Rain is strongly seasonal. January averages 250 mm against 42 mm in August — 5.9 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	30.2 °C	250 mm	70 %
February	30.6 °C	199 mm	61 %
March	29.0 °C	221 mm	63 %
April	27.4 °C	108 mm	52 %
May	25.1 °C	80 mm	50 %
June	24.8 °C	44 mm	44 %
July	24.5 °C	45 mm	43 %
August	25.3 °C	42 mm	42 %
September	26.4 °C	82 mm	54 %
October	27.4 °C	107 mm	65 %
November	27.5 °C	208 mm	72 %
December	29.1 °C	245 mm	70 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	30.2 °C	22.6 °C	25.9 °C	40.8 °C	17.8 °C	28	17
February	30.6 °C	22.6 °C	26.1 °C	39.6 °C	18.1 °C	27	17
March	29.0 °C	21.9 °C	25.0 °C	37.9 °C	17.2 °C	28	12
April	27.4 °C	20.3 °C	23.4 °C	35.9 °C	12.9 °C	23	6
May	25.1 °C	17.7 °C	20.9 °C	33.0 °C	11.5 °C	15	2
June	24.8 °C	16.2 °C	20.0 °C	33.1 °C	8.7 °C	14	1
July	24.5 °C	15.6 °C	19.5 °C	33.3 °C	8.6 °C	15	1
August	25.3 °C	16.1 °C	20.1 °C	34.7 °C	10.1 °C	17	3
September	26.4 °C	17.6 °C	21.4 °C	38.8 °C	9.6 °C	18	7
October	27.4 °C	19.3 °C	22.8 °C	39.8 °C	12.6 °C	21	10
November	27.5 °C	20.3 °C	23.4 °C	40.9 °C	14.0 °C	21	8
December	29.1 °C	21.8 °C	25.0 °C	39.0 °C	14.6 °C	26	13

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	250 mm	21	13 h/day	70 %	80 %	11 km/h
February	199 mm	18	13 h/day	61 %	80 %	11 km/h
March	221 mm	21	12 h/day	63 %	83 %	11 km/h
April	108 mm	14	12 h/day	52 %	83 %	11 km/h
May	80 mm	11	11 h/day	50 %	83 %	10 km/h
June	44 mm	7	11 h/day	44 %	82 %	10.0 km/h
July	45 mm	7	11 h/day	43 %	80 %	11 km/h
August	42 mm	7	11 h/day	42 %	79 %	12 km/h
September	82 mm	11	12 h/day	54 %	78 %	14 km/h
October	107 mm	13	13 h/day	65 %	79 %	14 km/h
November	208 mm	19	13 h/day	72 %	81 %	13 km/h
December	245 mm	21	14 h/day	70 %	81 %	12 km/h

How Itaboraí compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Itaboraí	31 °C	16 °C	1,630 mm	253
Magé · Brazil	31 °C	16 °C	1,588 mm	260
Niterói · Brazil	31 °C	17 °C	1,550 mm	268
Rio de Janeiro · Brazil	31 °C	17 °C	1,601 mm	265
Teresópolis · Brazil	26 °C	13 °C	2,028 mm	127
Petrópolis · Brazil	27 °C	13 °C	1,966 mm	154
Duque de Caxias · Brazil	31 °C	16 °C	1,613 mm	271

Where Itaboraí ranks

Ranking	Position	Value
The warmest places in South America in February	45th of 50	31 °C

Planning a trip? See the best time to visit Itaboraí.

QuestionsCommon questions about Itaboraí’s climate

When is the best time to visit Itaboraí?

That depends on what you want, so the honest answer is a comparison rather than a single month. June, July, August sit closest to 20 °C on average, February is the warmest month and August the driest. The month-by-month table above has the full picture.

How hot does Itaboraí get?

In February, the warmest month, daily highs average 31 °C. About 96 days a year pass 30 °C. The highest value in the 1991–2020 record is 41 °C.

How cold does it get in winter?

Nights average 16 °C in July, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Itaboraí?

January, averaging 250 mm over 21 days with rain. The driest month is August with 42 mm. The year as a whole averages 1,630 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Itaboraí rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: -22.744°, -42.859° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.