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Merlo Weather in December
December in Merlo brings high temperatures around 28°C (82°F) during the day, dropping to 15°C (59°F) at night, with quite a bit of rainfall expected, averaging around 123 mm (4.8 in) for the month.
Rainfall in Merlo in December
Based on our climate data of the past 30 years, about 12 days of rain are anticipated, with 123 mm (4.8 in) on average. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Merlo in December
In December, Merlo gets high temperatures, with highs of 28°C (82°F). Nights cool to around 15°C (59°F). December is part of the summer season. This kind of day-to-night contrast is typical for this time of year. With lows of 15°C (59°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.December in Merlo 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.
Merlo Temperature in December
Min Temperature
15°C (59°F)
Max Temperature
28°C (82°F)
Chance of Rain
40%
Precipitation
123 mm (4.8 in)
Rainy days
12 days
Merlo Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Merlo - and find the best time to visit.
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Merlo typically stay consistent throughout December, with daily highs averaging around 28°C (82°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 Merlo in December
Browse day-by-day weather records for Merlo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Merlo historical weather extremes in December
The extremes listed below come from historical weather data collected in Merlo from 1998 through 2025.
- Merlo recorded its highest December temperature of 42°C (108°F) on December 21, 2011.
- The coldest December day was on December 5, 1999, with a maximum of 16°C (61°F).
- Merlo registered its coldest December night on December 22, 2014, with temperatures dropping to 5°C (41°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 Merlo in December
Warm temperatures in December make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes.
What To Do in Merlo in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
Merlo 3-Day Forecast
More climate data for Merlo
See the full Merlo 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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