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December in Las Grutas brings high temperatures, with highs of 28°C (82°F) and nights dropping to 16°C (61°F). It's also the driest month of the year, ideal for those who want to avoid rain.
So this is a great month to visit if you prefer dry days with pleasant temperatures.
Pick a month to see the average temperature, rainfall and sunshine in Las Grutas - and find the best time to visit.
50-year average (1976-2025)
Based on our historical records, temperatures in Las Grutas typically stay consistent throughout December, with daily highs averaging around 28°C (82°F). Nights are pleasant, with lows typically ranging from 15°C (59°F) to 19°C (66°F).
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Browse day-by-day weather records for Las Grutas spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
The extremes listed below come from historical weather data collected in Las Grutas from 1984 through 2025.
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 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).
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. With minimal rainfall expected, you can leave the rain gear at home. With water temperatures around 16°C (61°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Humidity Wind Speed Water Temp
See the full Las Grutas climate overview or explore weather in Argentina.
Where to go in December - average daytime high across popular destinations.
Need travel inspiration? Check out our bucket list articles and be inspired.
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