The hottest month in Porto Alegre is typically January, with daytime highs averaging around 30.4°C (87°F), based on 10 years of historical weather data. Overnight lows during this period average near 21.1°C (70°F).

What is the coldest month in Porto Alegre?

The coldest month in Porto Alegre is typically July, with overnight lows averaging around 10.1°C (50°F) and daytime highs near 19.1°C (66°F), based on 10 years of historical weather data.

Does Porto Alegre have a rainy season?

Porto Alegre doesn't have a sharply defined rainy season rainfall is fairly spread across the year based on 10 years of historical data. September is the wettest month on average (about 173 mm), while February is the driest (about 83 mm).

What's the best time of year to visit Porto Alegre?

The best time to visit Porto Alegre is typically April, when daytime highs average a comfortable 25.4°C (78°F). Rainfall during this window averages around 99 mm, one of the lighter, more comfortable stretches of the year. This is based on 10 years of historical weather data.

Atmospheric Details

Wind

8 km/h

SSE · Light Breeze · Max 20 km/h

Humidity

98 %

High · feels muggy

UV Index

Low

Visibility

6 km

Good

Pressure

1008 hPa

Stable

Dew Point

15°C

Somewhat humid

Today vs Normal

18°C-4° below normal

The long-term average high for today is 22°C.

10 of the last 28 days with published data ran above normal.

It continues that pattern - today's forecast is also running below normal.

Red = above normal, blue = at or below · last 12 days

Air Quality

Good

Air quality is considered satisfactory, and air pollution poses little or no risk. It’s a good day to be active outside.

Health & Activity Advice

✅ Good for Outdoors

UV index is 1 today — low. Minimal sun protection is needed for most outdoor activity.

Air quality is considered satisfactory, and air pollution poses little or no risk. It’s a good day to be active outside.

Conditions are comfortable for outdoor activity at most points during the day today.