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.
Porto Alegre Monthly Temperatures
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:
Daily Historical Temperatures
50-year average (1976-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in June
Historical Porto Alegre Temperatures: 1976-2026
Browse day-by-day temperature records for Porto Alegre spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Porto Alegre vs Brazil
The map below shows the annual temperature across Brazil. You can also select individual months if you want to compare a specific time of year.
very warm
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pleasant
moderate
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Porto Alegre vs World: Temperature Compared
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.
What Does the Temperature Feel Like in Porto Alegre?
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.
