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Rosario Weather in December
December is one of the excellent months to visit Rosario, with daytime temperatures of 29°C (84°F) and lows of 17°C (63°F) at night. Do note that quite a bit of rainfall is typical, averaging around 90 mm (3.5 in).
Rainfall in Rosario in December
Typically, about 10 days will experience rainfall, with an average of 90 mm (3.5 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
December is a excellent month in Rosario, with 29°C (84°F) during the day and 17°C (63°F) at night. This kind of day-to-night contrast is typical for this time of year. With lows of 17°C (63°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, September and December typically offer the best weather for Rosario.
Rosario Temperature in December
Min Temperature
17°C (63°F)
Max Temperature
29°C (84°F)
Chance of Rain
32%
Precipitation
90 mm (3.5 in)
Rainy days
10 days
Rosario Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Rosario - and find the best time to visit.
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Rosario typically stay consistent throughout December, with daily highs averaging around 29°C (84°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
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather records 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 45 years of weather observations (1980-2025), these are the most extreme conditions recorded in Rosario.
- Rosario recorded its highest December temperature of 39°C (102°F) on December 26, 2013.
- On December 22, 1998, Rosario saw its coldest December day with temperatures maxing out at 16°C (61°F).
- Rosario registered its coldest December night on December 7, 2018, with temperatures dropping to 8°C (46°F).
Best Places in Uruguay in December
Find out more about the weather in Uruguay and which places have the best travel conditions in this month. See all of Uruguay in December →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
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.
What To Do in Rosario in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling7/10 -
Walking7/10 -
Camping8/10 -
Outdoor sports7/10
Rosario 3-Day Forecast
More climate data for Rosario
See the full Rosario climate overview or explore weather in Uruguay.
Popular in December
Where to go in December - average daytime high across popular destinations.
Colonia del Sacramento
27°C (81°F) Montevideo26°C (79°F) La Pedrera
24°C (75°F) José Ignacio24°C (75°F) Piriápolis25°C (77°F) La Paloma23°C (73°F) Punta Del Diablo24°C (75°F) Punta del Este23°C (73°F) Bucket list
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