Weather in Porto Alegre in August 2025
Average weather
Average temperature in Porto Alegre in August
Going from a maximum of +32°C during the day to a minimum of +3°C during the night, the temperature in August averages around +23°C.
The average maximum temperature goes up 3% by the end of the month, compared with the beginning of the month, from +26°C to +27°C.
Is Porto Alegre warm or cold in August?
Porto Alegre is typically mild in August.
Maximum temperatures go up compared to the previous month from +19°C to +21°C. The minimum temperature also goes up from +11°C to +12°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how August is compared to other months in Porto Alegre:
Climate in Porto Alegre in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +19°C | +21°C | +21°C | ||||
| Min. temperature | ||||||
| 0°C | +1°C | +4°C | ||||
| Max. temperature | ||||||
| +31°C | +35°C | +36°C | ||||
| Rainfall | ||||||
| 127 mm | 118 mm | 153 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 83% | 81% | 81% | ||||
| Air pressure | ||||||
| 1019 HPa | 1018 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 8 | 9 | 7 | ||||
| Cloudy days | ||||||
| 9 | 9 | 8 | ||||
| Rainy days | ||||||
| 12 | 12 | 13 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as ok as in July. It’s getting warmer as August arrives. The average maximum temperature goes up from +19°C to +21°C during the day. As August arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 127 mm to 118 mm. It feels drier, as humidity decreases from 83% to 81%. The average wind speed doesn’t change much during August, staying around 2 m/s. The good news is there are likely to be more sunny days in August, from 8 to 9.
September brings much the same weather, it remains ok.
Wind
The average wind speed is 2 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Porto Alegre is gradually increasing during August, going from 1 m/s to 2 m/s over the course of the month.
Rain
How was the weather last August in Porto Alegre?
Climate Change over Years
The climate in Porto Alegre in August has not changed much over the last 43 years.
The average temperature was the lowest in 1983 (+23°C) and the highest in 2012 (+26°C). The driest year was 2004 with only 1129 mm of rainfall, and the wettest year was 1998 with 2041 mm.
FAQ
Is August a good time to visit Porto Alegre?
Can you sunbathe in Porto Alegre in August?
Is Porto Alegre rainy in August?
Is it sunny in Porto Alegre in August?
Other cities in Brazil
Monthly weather in Porto Alegre
Source of the data
For this page, we’ve looked at the typical weather in Porto Alegre, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.