Mercedes Weather in December
Mercedes in December averages 30°C (86°F) during the day and 17°C (63°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Mercedes in December
Historically, the month has about 9 days of rain, averaging 119 mm (4.7 in) in total. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Mercedes in December
December in Mercedes brings typical temperatures with highs around 30°C (86°F) and lows of 17°C (63°F). Mornings and evenings are often more comfortable than the peak afternoon hours. 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.
Sunshine in Mercedes in December
Expect sunny days throughout the month, with an estimated 280 hours of sunshine. This makes it a pleasant time to visit Mercedes.
Wind Speed in Mercedes in December
Average wind speeds reach 3 m/s (6 knots) in December, creating light breezes that feel pleasant throughout the day. Some days are calmer, while others bring slightly more active breezes.December in Mercedes can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options 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 Uruguay, check out our Mercedes's climate page.
Mercedes Temperature in December
Min Temperature
17°C (63°F)
Max Temperature
30°C (86°F)
Chance of Rain
30%
Precipitation
119 mm (4.7 in)
Rainy days
9 days
Humidity
63%
Windspeed
3 m/s (6 knots)
Sunshine
280 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Mercedes typically rise from around 28°C (82°F) at the start of December to approximately 31°C (88°F) by the end. Nights are pleasant, with lows typically ranging from 15°C (59°F) to 19°C (66°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 Mercedes in December
Browse day-by-day weather records for Mercedes spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Mercedes historical weather extremes in December
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Mercedes.
- The hottest December day on record in Mercedes reached 41°C (106°F) (December 26, 2013).
- The coldest December day was on December 4, 1978, with a maximum of 17°C (63°F).
- Mercedes registered its coldest December night on December 7, 1982, with temperatures dropping to 5°C (41°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
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tolerable
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What to Wear in Mercedes in December
Warm but pleasant conditions in Mercedes 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 Mercedes 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 Uruguay, check out our Mercedes's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Mercedes climate overview or explore weather in Uruguay.
