The temperatures in Porto Alegre in September are comfortable with low of 13°C and and high up to 23°C.
You can expect rain for roughly half of the month of September in Porto Alegre. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Porto Alegre in September 2025.
If you’re planning to visit Porto Alegre in the near future, we highly recommend that you review the 14 day weather forecast for Porto Alegre before you arrive.
Temperatures
23° / 13°
Rainy Days
8
Snowy Days
0
Dry Days
22
Rainfall
187
mm
Sun Hours
8.8
Hrs
