Rosario Weather in December
December in Rosario brings very high temperatures, with highs of 30°C (86°F) and nights dropping to 18°C (64°F). Rainfall is on the higher side this month, averaging around 110 mm (4.3 in), so keep a rain jacket handy.
Rainfall in Rosario in December
Looking at the last 30 years, the data shows about 9 days with rain, averaging 110 mm (4.3 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Rosario in December
Daytime temperatures in Rosario reach 30°C (86°F) in December, dropping to 18°C (64°F) at night. The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. With overnight lows of 18°C (64°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Rosario in December
Expect a lot of sunshine this month, with about 279 hours of sun. These sunny conditions add to the overall experience.
Wind Speed in Rosario in December
In December, average wind speeds reach 4 m/s (8 knots), leading to light to moderate breezes. Conditions vary from day to day, with both calm and windier periods.December in Rosario has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Argentina, check out our Rosario's climate page.
Rosario Temperature in December
Min Temperature
18°C (64°F)
Max Temperature
30°C (86°F)
Chance of Rain
29%
Precipitation
110 mm (4.3 in)
Rainy days
9 days
Humidity
68%
Windspeed
4 m/s (8 knots)
Sunshine
279 hours
Percentage Sunshine
64%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Rosario typically stay consistent throughout December, with daily highs averaging around 30°C (86°F). Nights are pleasant, with lows typically ranging from 16°C (61°F) to 20°C (68°F).
Average temperatures in 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
Historical weather for Rosario in December
Browse day-by-day weather records for Rosario spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Rosario historical weather extremes in December
Based on 37 years of weather observations (1988-2025), these are the most extreme conditions recorded in Rosario.
- Rosario recorded its highest December temperature of 39°C (102°F) on December 16, 1995.
- The coldest December day was on December 3, 2001, with a maximum of 18°C (64°F).
- The lowest overnight temperature recorded in December was 7°C (45°F) (December 13, 2010).
Best Places in Argentina in December
Find out more about the weather in Argentina and which places have the best travel conditions in this month. See all of Argentina in December →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Rosario in December
Warm but pleasant conditions in Rosario 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 Rosario in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Argentina, check out our Rosario's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Rosario climate overview or explore weather in Argentina.
