Weather in Porto Alegre in May 2025
Average weather
Average temperature in Porto Alegre in May
Going from a maximum of +29°C during the day to a minimum of +9°C during the night, the temperature in May averages around +23°C.
The average maximum temperature goes down 10% by the end of the month, compared with the beginning of the month, from +24°C to +22°C.
Is Porto Alegre warm or cold in May?
Porto Alegre is typically mild in May.
Maximum temperatures go down compared to the previous month from +25°C to +21°C. The minimum temperature also goes down from +17°C to +14°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
May is one of the coolest months in Porto Alegre, here is the comparison with other months:
Climate in Porto Alegre in May
| April | May | June | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +25°C | +21°C | +19°C | ||||
| Min. temperature | ||||||
| +6°C | +4°C | +1°C | ||||
| Max. temperature | ||||||
| +35°C | +32°C | +31°C | ||||
| Rainfall | ||||||
| 108 mm | 104 mm | 115 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 81% | 83% | 84% | ||||
| Air pressure | ||||||
| 1014 HPa | 1016 HPa | 1018 HPa | ||||
| Sunny days | ||||||
| 8 | 7 | 6 | ||||
| Cloudy days | ||||||
| 8 | 10 | 11 | ||||
| Rainy days | ||||||
| 13 | 12 | 12 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
May typically has worse weather conditions compared to April. It’s getting colder in May. From +25°C in the day, the average maximum temperature lowers to +21°C. As May arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 108 mm to 104 mm. Humidity rises from 81% to 83%. The average wind speed doesn’t change much during May, staying around 2 m/s. The days becoming less sunny, going from 8 sunny days in April to 7 in May.
June brings much the same weather, it remains ok.
Wind
The average wind speed is 2 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Porto Alegre is gradually decreasing during May, going from 3 m/s to 1 m/s over the course of the month.
Rain
How was the weather last May in Porto Alegre?
Climate Change over Years
The climate in Porto Alegre in May 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 May a good time to visit Porto Alegre?
Can you sunbathe in Porto Alegre in May?
Is Porto Alegre rainy in May?
Is it sunny in Porto Alegre in May?
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.