São João de Meriti climate

Name: São João de Meriti
Address: BR

São João de Meriti is warmest in February, with average highs of 32 °C, and coldest in July, when nights average 16 °C. January is the wettest month (258 mm) and August the driest (42 mm). Figures are 1991–2020 climate normals.

Across a full year São João de Meriti averages 1,633 mm of rain and 279 days above 25 °C.

Brazil · population 466,536 · 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 32 °C
Coldest month July 16 °C
Driest month August 42 mm
Wettest month January 258 mm
Least cloud August 45 % cloud
Hottest on record October 41 °C
Coldest on record June 9.6 °C

What to expectSão João de Meriti through the year

São João de Meriti has a clear annual cycle: average daily highs run from 25 °C in July to 32 °C in February, a swing of 6.6 °C in mean temperature across the year.

Counted across a normal year, 279 days a year reach 25 °C, 130 of them reach 30 °C. The warmest reading in the 1991–2020 record is 41 °C, in October.

Rain is strongly seasonal. January averages 258 mm against 42 mm in August — 6.1 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	31.2 °C	258 mm	72 %
February	31.7 °C	196 mm	64 %
March	30.1 °C	215 mm	65 %
April	28.4 °C	105 mm	55 %
May	26.1 °C	76 mm	53 %
June	25.7 °C	48 mm	47 %
July	25.5 °C	47 mm	45 %
August	26.5 °C	42 mm	45 %
September	27.5 °C	87 mm	57 %
October	28.6 °C	116 mm	67 %
November	28.5 °C	211 mm	74 %
December	30.2 °C	232 mm	72 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	31.2 °C	23.4 °C	26.7 °C	40.1 °C	18.0 °C	29	20
February	31.7 °C	23.5 °C	27.0 °C	38.6 °C	18.9 °C	28	20
March	30.1 °C	22.8 °C	25.9 °C	37.5 °C	17.9 °C	30	16
April	28.4 °C	21.2 °C	24.3 °C	35.6 °C	13.5 °C	25	9
May	26.1 °C	18.5 °C	21.8 °C	33.8 °C	11.0 °C	18	4
June	25.7 °C	17.1 °C	20.8 °C	33.2 °C	9.6 °C	17	2
July	25.5 °C	16.5 °C	20.4 °C	34.1 °C	9.6 °C	18	3
August	26.5 °C	16.9 °C	21.0 °C	35.9 °C	10.9 °C	20	7
September	27.5 °C	18.5 °C	22.3 °C	39.5 °C	11.9 °C	20	10
October	28.6 °C	20.1 °C	23.7 °C	40.6 °C	13.7 °C	23	13
November	28.5 °C	21.1 °C	24.3 °C	39.3 °C	14.3 °C	23	11
December	30.2 °C	22.6 °C	25.9 °C	39.2 °C	16.5 °C	28	16

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	258 mm	21	13 h/day	72 %	79 %	11 km/h
February	196 mm	18	13 h/day	64 %	78 %	11 km/h
March	215 mm	21	12 h/day	65 %	82 %	10 km/h
April	105 mm	14	12 h/day	55 %	82 %	10 km/h
May	76 mm	11	11 h/day	53 %	82 %	9.8 km/h
June	48 mm	7	11 h/day	47 %	81 %	9.6 km/h
July	47 mm	7	11 h/day	45 %	79 %	10 km/h
August	42 mm	7	11 h/day	45 %	77 %	12 km/h
September	87 mm	11	12 h/day	57 %	77 %	13 km/h
October	116 mm	14	13 h/day	67 %	78 %	13 km/h
November	211 mm	19	13 h/day	74 %	80 %	12 km/h
December	232 mm	21	14 h/day	72 %	80 %	12 km/h

How São João de Meriti 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
São João de Meriti	32 °C	16 °C	1,633 mm	279
Duque de Caxias · Brazil	31 °C	16 °C	1,613 mm	271
Nova Iguaçu · Brazil	32 °C	16 °C	1,386 mm	277
Barra da Tijuca · Brazil	31 °C	17 °C	1,091 mm	277
Rio de Janeiro · Brazil	31 °C	17 °C	1,601 mm	265
Niterói · Brazil	31 °C	17 °C	1,550 mm	268
Magé · Brazil	31 °C	16 °C	1,588 mm	260

Where São João de Meriti ranks

Ranking	Position	Value
The warmest places in South America in February	21st of 50	32 °C
The warmest places in South America in January	29th of 50	31 °C
The warmest places in South America in December	49th of 50	30 °C
The warmest places in South America in March	50th of 50	30 °C

Planning a trip? See the best time to visit São João de Meriti.

QuestionsCommon questions about São João de Meriti’s climate

When is the best time to visit São João de Meriti?

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 São João de Meriti get?

In February, the warmest month, daily highs average 32 °C. About 130 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 São João de Meriti?

January, averaging 258 mm over 21 days with rain. The driest month is August with 42 mm. The year as a whole averages 1,633 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 São João de Meriti 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: -22.804°, -43.372° (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.