Ibera National Park - The restored wetlands of Argentina
Iberá National Park is Argentina's biggest wetland, created in 2018 and destined to rank among Argentina's top tourist destinations.
Mercedes Weather in December
December in Mercedes typically sees daytime highs of 31°C (88°F) and nighttime lows of 18°C (64°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in Mercedes in December
Historically, December sees about of rain, with a monthly average of 139 mm (5.5 in).
Temperature in Mercedes in December
Expect highs of 31°C (88°F) in Mercedes in December, with nights dropping to around 18°C (64°F). For most visitors, the main thing to prepare for is the heat during the day. Nights drop to around 18°C (64°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in Mercedes in December
The city usually sees around 291 hours of sunlight, indicating many sunny days , a great month for sightseeing.If you're looking for dry conditions and comfortable temperatures, December may not be the ideal month to visit Mercedes. Our weather planner can help you explore destinations with more pleasant weather conditions.
Mercedes Temperature in December
Min Temperature
18°C (64°F)
Max Temperature
31°C (88°F)
Precipitation
139 mm (5.5 in)
Humidity
62%
Sunshine
291 hours
Percentage Sunshine
Mercedes Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Mercedes - and find the best time to visit.
Historical weather records 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 19 years of weather observations (2006-2025), these are the most extreme conditions recorded in Mercedes.
- On December 9, 2022, temperatures climbed to 40°C (104°F), marking the warmest December day on record.
- Mercedes experienced its chilliest December day on December 12, 2010, reaching only 20°C (68°F).
- The coldest night in December in Mercedes was on December 3, 2018, with a minimum of 11°C (52°F).
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
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 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. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Mercedes in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming9/10 -
Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
Mercedes 3-Day Forecast
More climate data for Mercedes
Temperature Rainfall Sunshine Humidity
See the full Mercedes climate overview or explore weather in Argentina.
Popular in December
Where to go in December - average daytime high across popular destinations.
Córdoba
30°C (86°F) Mendoza
30°C (86°F) Buenos Aires29°C (84°F) Villa Carlos Paz
27°C (81°F) Salta25°C (77°F) Mar del Plata24°C (75°F) San Martín de los Andes
18°C (64°F) San Carlos de Bariloche18°C (64°F) Bucket list
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Ibera National Park - The restored wetlands of Argentina
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