Niterói climate

Name: Niterói
Address: BR

Niterói is warmest in February, with average highs of 31 °C, and coldest in July, when nights average 17 °C. January is the wettest month (234 mm) and August the driest (45 mm). Figures are 1991–2020 climate normals.

Across a full year Niterói averages 1,550 mm of rain and 268 days above 25 °C.

Brazil · population 515,317 · 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 17 °C
Driest month August 45 mm
Wettest month January 234 mm
Least cloud August 42 % cloud
Hottest on record October 40 °C
Coldest on record June 11 °C
Warmest sea March 25 °C

What to expectNiterói through the year

Niterói has a clear annual cycle: average daily highs run from 25 °C in July to 31 °C in February, a swing of 6.4 °C in mean temperature across the year.

Counted across a normal year, 268 days a year reach 25 °C, 107 of them reach 30 °C. The warmest reading in the 1991–2020 record is 40 °C, in October.

Rain is strongly seasonal. January averages 234 mm against 45 mm in August — 5.2 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Niterói is warmest in March at 25 °C and coldest in August at 21 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	30.7 °C	234 mm	70 %
February	31.1 °C	176 mm	61 %
March	29.6 °C	202 mm	63 %
April	28.0 °C	101 mm	52 %
May	25.6 °C	78 mm	50 %
June	25.2 °C	47 mm	44 %
July	24.9 °C	50 mm	43 %
August	25.8 °C	45 mm	42 %
September	26.7 °C	86 mm	55 %
October	27.9 °C	109 mm	65 %
November	28.0 °C	200 mm	72 %
December	29.6 °C	221 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	30.7 °C	23.5 °C	26.6 °C	39.1 °C	18.7 °C	29	18
February	31.1 °C	23.6 °C	26.9 °C	37.8 °C	18.6 °C	28	18
March	29.6 °C	23.0 °C	25.8 °C	37.3 °C	18.1 °C	30	14
April	28.0 °C	21.5 °C	24.3 °C	34.8 °C	14.6 °C	25	7
May	25.6 °C	19.1 °C	21.9 °C	33.2 °C	13.9 °C	17	2
June	25.2 °C	17.9 °C	21.0 °C	32.4 °C	11.3 °C	16	1
July	24.9 °C	17.2 °C	20.5 °C	33.9 °C	11.3 °C	16	1
August	25.8 °C	17.5 °C	21.0 °C	35.4 °C	11.8 °C	18	4
September	26.7 °C	18.7 °C	22.1 °C	39.0 °C	11.4 °C	18	7
October	27.9 °C	20.1 °C	23.4 °C	39.8 °C	13.3 °C	22	10
November	28.0 °C	21.1 °C	24.1 °C	38.2 °C	15.0 °C	22	9
December	29.6 °C	22.6 °C	25.7 °C	38.3 °C	16.8 °C	28	14

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	234 mm	19	13 h/day	70 %	79 %	11 km/h	25.1 °C
February	176 mm	17	13 h/day	61 %	78 %	11 km/h	25.1 °C
March	202 mm	19	12 h/day	63 %	81 %	10 km/h	25.4 °C
April	101 mm	13	12 h/day	52 %	81 %	10 km/h	24.9 °C
May	78 mm	10	11 h/day	50 %	81 %	10 km/h	23.6 °C
June	47 mm	7	11 h/day	44 %	81 %	9.7 km/h	22.6 °C
July	50 mm	7	11 h/day	43 %	79 %	10 km/h	21.9 °C
August	45 mm	7	11 h/day	42 %	77 %	12 km/h	21.3 °C
September	86 mm	11	12 h/day	55 %	77 %	13 km/h	21.3 °C
October	109 mm	13	13 h/day	65 %	77 %	13 km/h	21.8 °C
November	200 mm	18	13 h/day	72 %	79 %	12 km/h	22.5 °C
December	221 mm	19	14 h/day	70 %	80 %	12 km/h	24.0 °C

How Niterói 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
Niterói	31 °C	17 °C	1,550 mm	268
Rio de Janeiro · Brazil	31 °C	17 °C	1,601 mm	265
Duque de Caxias · Brazil	31 °C	16 °C	1,613 mm	271
Magé · Brazil	31 °C	16 °C	1,588 mm	260
São João de Meriti · Brazil	32 °C	16 °C	1,633 mm	279
Itaboraí · Brazil	31 °C	16 °C	1,630 mm	253
Barra da Tijuca · Brazil	31 °C	17 °C	1,091 mm	277

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

QuestionsCommon questions about Niterói’s climate

When is the best time to visit Niterói?

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 Niterói get?

In February, the warmest month, daily highs average 31 °C. About 107 days a year pass 30 °C. The highest value in the 1991–2020 record is 40 °C.

How cold does it get in winter?

Nights average 17 °C in July, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Niterói?

January, averaging 234 mm over 19 days with rain. The driest month is August with 45 mm. The year as a whole averages 1,550 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 Niterói 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
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.