Porto Alegre climate

Name: Porto Alegre
Address: BR

Porto Alegre is warmest in January, with average highs of 29 °C, and coldest in July, when nights average 10 °C. October is the wettest month (173 mm) and April the driest (107 mm). Figures are 1991–2020 climate normals.

Across a full year Porto Alegre averages 1,542 mm of rain, 170 days above 25 °C and 0 days below freezing.

Brazil · population 1,488,252 · 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 January 29 °C
Coldest month July 10 °C
Driest month April 107 mm
Wettest month October 173 mm
Least cloud March 52 % cloud
Hottest on record December 39 °C
Coldest on record July -0.2 °C

What to expectPorto Alegre through the year

Porto Alegre has a clear annual cycle: average daily highs run from 19 °C in July to 29 °C in January, a swing of 11 °C in mean temperature across the year.

Counted across a normal year, 170 days a year reach 25 °C, 48 of them reach 30 °C, 0 nights drop below freezing. The warmest reading in the 1991–2020 record is 39 °C, in December.

Rain is spread fairly evenly through the year, from 107 mm in April to 173 mm in October. There is no dry season to aim for.

Month by month

Month	Avg high	Rainfall	Cloud
January	29.3 °C	138 mm	55 %
February	28.8 °C	127 mm	56 %
March	27.6 °C	111 mm	52 %
April	25.0 °C	107 mm	55 %
May	21.2 °C	108 mm	60 %
June	19.2 °C	118 mm	63 %
July	18.6 °C	140 mm	59 %
August	20.7 °C	122 mm	56 %
September	21.7 °C	149 mm	61 %
October	23.9 °C	173 mm	64 %
November	26.1 °C	125 mm	54 %
December	28.5 °C	123 mm	54 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	29.3 °C	20.7 °C	24.6 °C	38.3 °C	13.1 °C	29	12
February	28.8 °C	20.8 °C	24.4 °C	37.6 °C	12.1 °C	25	9
March	27.6 °C	19.5 °C	23.1 °C	37.2 °C	9.8 °C	24	6
April	25.0 °C	16.7 °C	20.5 °C	33.5 °C	5.6 °C	14	3
May	21.2 °C	13.4 °C	16.9 °C	30.0 °C	3.4 °C	4	0
June	19.2 °C	11.1 °C	14.7 °C	28.6 °C	0.4 °C	3	0
July	18.6 °C	10.1 °C	13.9 °C	28.8 °C	-0.2 °C	3	0
August	20.7 °C	11.2 °C	15.4 °C	32.1 °C	0.1 °C	6	1
September	21.7 °C	13.0 °C	16.9 °C	35.3 °C	3.3 °C	6	2
October	23.9 °C	15.4 °C	19.3 °C	36.1 °C	7.5 °C	11	2
November	26.1 °C	17.0 °C	21.2 °C	37.2 °C	9.1 °C	18	4
December	28.5 °C	19.4 °C	23.5 °C	38.6 °C	10.9 °C	26	10

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	138 mm	14	14 h/day	55 %	76 %	19 km/h
February	127 mm	13	13 h/day	56 %	78 %	18 km/h
March	111 mm	12	12 h/day	52 %	79 %	17 km/h
April	107 mm	9	11 h/day	55 %	80 %	16 km/h
May	108 mm	9	11 h/day	60 %	82 %	15 km/h
June	118 mm	9	10 h/day	63 %	84 %	15 km/h
July	140 mm	10	10 h/day	59 %	83 %	16 km/h
August	122 mm	10	11 h/day	56 %	81 %	16 km/h
September	149 mm	11	12 h/day	61 %	80 %	19 km/h
October	173 mm	12	13 h/day	64 %	79 %	19 km/h
November	125 mm	11	14 h/day	54 %	76 %	19 km/h
December	123 mm	12	14 h/day	54 %	75 %	19 km/h

How Porto Alegre 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
Porto Alegre	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
Caxias do Sul · Brazil	25 °C	7.3 °C	2,002 mm	78

Where Porto Alegre ranks

Ranking	Position	Value
Places with the best weather in South America in October	49th of 50	81/100

Planning a trip? See the best time to visit Porto Alegre.

QuestionsCommon questions about Porto Alegre’s climate

When is the best time to visit Porto Alegre?

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

How hot does Porto Alegre get?

In January, the warmest month, daily highs average 29 °C. About 48 days a year pass 30 °C. The highest value in the 1991–2020 record is 39 °C.

How cold does it get in winter?

Nights average 10 °C in July, the coldest month. A normal year has 0 nights below freezing.

Which month is wettest in Porto Alegre?

October, averaging 173 mm over 12 days with rain. The driest month is April with 107 mm. The year as a whole averages 1,542 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 Porto Alegre 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: -30.033°, -51.230° (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.