Annual mean 20°C · wettest around September · prevailing wind S
Warmest
29.1 °C
Coldest
16.3 °C
Wettest
68%
Windiest
4.1 m/s
Prevailing
S
3.3 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Porto Alegre over the whole year is 20°C. January is the hottest month, with highs of about 29°C; July is the coldest, with lows of about 11°C. Porto Alegre has no sharply defined rainy season: the chance of rain on a given day runs from 29% in July, the driest month, to 47% in September, the wettest. Winds in Porto Alegre are highest in December, averaging 3.3 m/s (12 km/h), and lightest in May, at 2.2 m/s (8 km/h). The prevailing wind is from the S. The clearest skies in Porto Alegre come in February, when the sky is typically 47% covered; September is the cloudiest month, at 63%.
Month by month Porto Alegre climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
29°C
21°C
30°C
44%
51%
3.2 m/s
28
55
7
February
28°C
21°C
30°C
31%
47%
2.9 m/s
30
56
10
March
27°C
20°C
28°C
36%
52%
2.7 m/s
42
58
15
April
24°C
17°C
24°C
31%
52%
2.5 m/s
68
42
38
May
20°C
14°C
19°C
44%
54%
2.2 m/s
72
16
67
June
18°C
12°C
16°C
39%
57%
2.2 m/s
54
11
70
July
17°C
11°C
16°C
29%
52%
2.3 m/s
51
9
69
August
19°C
12°C
18°C
46%
53%
2.4 m/s
61
14
69
September
21°C
15°C
20°C
47%
63%
3.0 m/s
69
17
65
October
23°C
16°C
22°C
46%
61%
3.2 m/s
74
25
55
November
25°C
18°C
25°C
39%
51%
3.2 m/s
63
44
34
December
28°C
20°C
28°C
33%
51%
3.3 m/s
42
52
19
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Porto Alegre weather by season
Year round, Porto Alegre has days of about 17°C at their warmest in July, its coolest month, and 29°C in January, its warmest; the coolest hours of the day run from 11°C to 21°C through the year, and the average temperature over the year is 20°C around the clock. Rain is most likely around September and least likely around July. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Porto Alegre weather in winterJune to August
High 18°CLow 12°CRain 38%
Winter in Porto Alegre has typical daily highs of about 18°C and lows of about 12°C, with a 38% chance of rain on a given day.
Porto Alegre weather in springSeptember to November
High 23°CLow 16°CRain 44%
Spring in Porto Alegre has typical daily highs of about 23°C and lows of about 16°C, with a 44% chance of rain on a given day.
Porto Alegre weather in summerDecember to February
High 28°CLow 21°CRain 36%
Summer in Porto Alegre has typical daily highs of about 28°C and lows of about 21°C, with a 36% chance of rain on a given day.
Porto Alegre weather in autumnMarch to May
High 24°CLow 17°CRain 37%
Autumn in Porto Alegre has typical daily highs of about 24°C and lows of about 17°C, with a 37% chance of rain on a given day.
When is the rainy season in Porto Alegre?
Porto Alegre has no sharply defined rainy season: the chance of rain on a given day runs from 29% in July, the driest month, to 47% in September, the wettest.
What time of year is Porto Alegre windiest?
Winds in Porto Alegre are highest in December, averaging 3.3 m/s (12 km/h), and lightest in May, at 2.2 m/s (8 km/h). The prevailing wind is from the S.
What is the average temperature in Porto Alegre year round?
The average temperature in Porto Alegre over the whole year is 20°C. January is the hottest month, with highs of about 29°C; July is the coldest, with lows of about 11°C.