Porto Alegre Temperature by Month

Porto Alegre, Rio Grande do Sul, Brazil has an average annual maximum temperature of 26°C (79°F), with moderate seasonal shifts ranging from 20°C (68°F) in July to 31°C (88°F) in January. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

The climate in Porto Alegre experiences moderate temperature changes, with mild shifts between seasons. At night, temperatures range from 21°C (70°F) in January to 10°C (50°F) in July.

The chart below illustrates the average maximum day and minimum night temperatures in Porto Alegre by month:

The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM. January, the city's warmest month, gets 228 hours of sunshine.

The chart below shows the average temperature throughout the year:

Porto Alegre's average annual maximum temperature is 26°C (79°F). To put that in context, here's how it compares to a few well-known destinations:

Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.

Reykjavík, Iceland averages 9°C (48°F) a year, mild summers by Icelandic standards, but cold winters and frequent wind.

Chicago, USA averages 15°C (59°F) annually, known for extreme seasonal swings, from bitterly cold winters to warm summers.

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Porto Alegre, July is the coolest month, with average highs of 20°C (68°F) and humidity around 81%, considered very high. In January, the warmest month, temperatures average 31°C (88°F) with 71% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.

Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.

For more on Porto Alegre's weather, including monthly rainfall, sunshine hours, and humidity, visit our Porto Alegre climate page.