Rio Grande climate

Name: Rio Grande
Address: BR

Rio Grande is warmest in February, with average highs of 25 °C, and coldest in July, when nights average 12 °C. October is the wettest month (137 mm) and November the driest (92 mm). Figures are 1991–2020 climate normals.

Across a full year Rio Grande averages 1,319 mm of rain and 45 days above 25 °C.

Brazil · population 198,935 · 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 25 °C
Coldest month July 12 °C
Driest month November 92 mm
Wettest month October 137 mm
Least cloud March 51 % cloud
Hottest on record January 34 °C
Coldest on record July 2.9 °C
Warmest sea February 24 °C

What to expectRio Grande through the year

Rio Grande has a clear annual cycle: average daily highs run from 15 °C in July to 25 °C in February, a swing of 10 °C in mean temperature across the year.

Counted across a normal year, 45 days a year reach 25 °C, 2 of them reach 30 °C. The warmest reading in the 1991–2020 record is 34 °C, in January.

Rain is spread fairly evenly through the year, from 92 mm in November to 137 mm in October. There is no dry season to aim for.

The sea off Rio Grande is warmest in February at 24 °C and coldest in July at 14 °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	24.9 °C	98 mm	53 %
February	25.1 °C	94 mm	53 %
March	24.2 °C	104 mm	51 %
April	21.9 °C	121 mm	53 %
May	18.7 °C	104 mm	58 %
June	16.3 °C	114 mm	59 %
July	15.2 °C	116 mm	58 %
August	16.1 °C	110 mm	56 %
September	17.0 °C	133 mm	60 %
October	19.2 °C	137 mm	62 %
November	21.3 °C	92 mm	53 %
December	23.5 °C	96 mm	51 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	24.9 °C	21.9 °C	23.3 °C	33.7 °C	15.7 °C	13	1
February	25.1 °C	22.2 °C	23.5 °C	32.3 °C	15.1 °C	13	1
March	24.2 °C	21.3 °C	22.7 °C	32.6 °C	13.8 °C	9	0
April	21.9 °C	18.7 °C	20.2 °C	30.5 °C	9.3 °C	2	0
May	18.7 °C	15.6 °C	17.1 °C	25.7 °C	7.3 °C	0	0
June	16.3 °C	12.9 °C	14.5 °C	26.1 °C	4.5 °C	0	0
July	15.2 °C	11.6 °C	13.3 °C	26.2 °C	2.9 °C	0	0
August	16.1 °C	12.4 °C	14.1 °C	25.8 °C	3.8 °C	0	0
September	17.0 °C	13.6 °C	15.2 °C	27.9 °C	5.3 °C	0	0
October	19.2 °C	16.0 °C	17.5 °C	31.9 °C	8.8 °C	1	0
November	21.3 °C	18.0 °C	19.6 °C	32.8 °C	10.6 °C	1	0
December	23.5 °C	20.2 °C	21.7 °C	32.9 °C	11.4 °C	6	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	98 mm	10	14 h/day	53 %	78 %	27 km/h	23.9 °C
February	94 mm	11	13 h/day	53 %	77 %	26 km/h	24.4 °C
March	104 mm	11	12 h/day	51 %	77 %	25 km/h	23.9 °C
April	121 mm	10	11 h/day	53 %	77 %	25 km/h	21.8 °C
May	104 mm	9	10 h/day	58 %	79 %	24 km/h	18.8 °C
June	114 mm	10	10 h/day	59 %	80 %	24 km/h	15.9 °C
July	116 mm	10	10 h/day	58 %	81 %	25 km/h	14.0 °C
August	110 mm	10	11 h/day	56 %	81 %	25 km/h	14.1 °C
September	133 mm	10	12 h/day	60 %	80 %	27 km/h	15.2 °C
October	137 mm	10	13 h/day	62 %	80 %	28 km/h	17.5 °C
November	92 mm	8	14 h/day	53 %	77 %	28 km/h	19.9 °C
December	96 mm	8	14 h/day	51 %	77 %	27 km/h	22.2 °C

How Rio Grande 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
Rio Grande	25 °C	12 °C	1,319 mm	45
Pelotas · Brazil	27 °C	10 °C	1,374 mm	95
Porto Alegre · Brazil	29 °C	10 °C	1,542 mm	170
Viamão · Brazil	28 °C	10 °C	1,553 mm	150
Novo Hamburgo · Brazil	29 °C	9.4 °C	1,732 mm	165

Where Rio Grande ranks

Ranking	Position	Value
The coolest places in South America in September	16thof 50	17 °C
The coolest places in South America in August	24thof 50	16 °C
The coolest places in South America in October	25thof 50	19 °C
The coolest places in South America in July	28thof 50	15 °C
The coolest places in South America year-round	30thof 50	20 °C
The coolest places in South America in November	32ndof 50	21 °C

Planning a trip? See the best time to visit Rio Grande.

QuestionsCommon questions about Rio Grande’s climate

When is the best time to visit Rio Grande?

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

How hot does Rio Grande get?

In February, the warmest month, daily highs average 25 °C. About 2 days a year pass 30 °C. The highest value in the 1991–2020 record is 34 °C.

How cold does it get in winter?

Nights average 12 °C in July, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Rio Grande?

October, averaging 137 mm over 10 days with rain. The driest month is November with 92 mm. The year as a whole averages 1,319 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 Rio Grande 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.