Porto Alegre Weather in December

Porto Alegre in December sees very high temperatures, with highs around 30°C (86°F) and overnight lows of 19°C (66°F). Rainfall is fairly high at around 129 mm (5.1 in) on average, so pack waterproofs just in case.

Rainfall in Porto Alegre in December

Historically, approximately 16 days this month are expected to have rain, averaging 129 mm (5.1 in). This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.

Temperature in Porto Alegre in December

Temperatures in Porto Alegre in December top out at 30°C (86°F) and drop to 19°C (66°F) overnight. The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. At 19°C (66°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Porto Alegre in December

Enjoy a sunny month with about 233 hours of sunshine, the clear skies make Porto Alegre even more beautiful.

Wind Speed in Porto Alegre in December

Average wind conditions reach 1 m/s (2 knots) in December. This creates generally peaceful weather with subtle air movement. Remember this is an average: some days are windless while others have noticeable or very gentle breezes.

If you prefer dry days with pleasant temperatures, December may not be the ideal month to visit Porto Alegre. Our weather planner can help you explore destinations with more pleasant weather conditions.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Brazil, check out our Porto Alegre's climate page.

Porto Alegre Temperature in December

Min Temperature 19°C (66°F)  

Max Temperature 30°C (86°F)  

Chance of Rain 53%  

Precipitation 129 mm (5.1 in)  

Rainy days 16 days  

Humidity 69%  

Windspeed 1 m/s (2 knots)  

Sunshine 233 hours  

Percentage Sunshine  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Porto Alegre typically stay consistent throughout December, with daily highs averaging around 30°C (86°F). Nights are pleasant, with lows typically ranging from 18°C (64°F) to 21°C (70°F).

Average temperatures in December

‹ Select year to compare to 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 ›

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in December

‹ Select year to compare to 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 ›

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Historical weather for Porto Alegre in December

Browse day-by-day weather records for Porto Alegre spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

‹ 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 ›

‹ January February March April May June July August September October November December ›

Porto Alegre historical weather extremes in December

Based on 23 years of weather observations (2002-2025), these are the most extreme conditions recorded in Porto Alegre.

• The warmest day in December was on December 25, 2012, with a maximum of 39°C (102°F).
• The coldest December day was on December 6, 2020, with a maximum of 20°C (68°F).
• The coldest night in December in Porto Alegre was on December 14, 2010, with a minimum of 11°C (52°F).
• The wettest day in December Porto Alegre was on December 6, 2021 with 50 mm (2 in) of precipitation.

What to Wear in Porto Alegre in December

Warm but pleasant conditions in Porto Alegre in December. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Porto Alegre in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Brazil, check out our Porto Alegre's climate page.

More climate data for Porto Alegre

Temperature Rainfall Sunshine Humidity Wind Speed

See the full Porto Alegre climate overview or explore weather in Brazil.