San Luis Province Weather in December

Average temperatures, rainfall, sunshine and the best places to visit in San Luis Province, Argentina in December.

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Merlo Potrero de los Funes San Luis Cortaderas

Planning a getaway to San Luis Province, Argentina this December and curious about the weather you should prepare for? Discover all the vital details you need on this page, solving your puzzle:

What to Expect in San Luis Province in December

San Luis Province, Argentina is a region in Argentina. December in San Luis Province generally has temperatures that range from warm to very warm, with high precipitation. December is a summer month.

Temperatures

During the day the temperature is warm in Cortaderas at 27°C (81°F) and very warm in San Luis at 31°C (88°F). As night falls, temperatures generally drop to 17°C (63°F) in San Luis and 14°C (57°F) in Cortaderas.

To learn more about the conditions in specific areas of San Luis Province, Argentina, check out the map below.

Precipitation

In December, precipitation varies across different areas. From high rainfall in San Luis with an average of 101 mm (4 in) to high rainfall in Carpintería with 126 mm (5 in).

Explore San Luis Province by month

Pick a month to see the average temperature, rainfall and sunshine in San Luis Province — and find the best time to visit. (based on Merlo)

January28°C (82°F) February27°C (81°F) March25°C (77°F) April22°C (72°F) May18°C (64°F) June16°C (61°F) This monthJuly15°C (59°F) August19°C (66°F) September21°C (70°F) October24°C (75°F) November26°C (79°F) December28°C (82°F)
Best Time to Visit San Luis Province →

Best Places to Visit in San Luis Province in December

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across San Luis Province.

Conditions Temperatures Precipitation
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).

Popular Destinations in San Luis Province

What is the weather like in December for some of the most popular destinations in San Luis Province, Argentina?

Temperature range in San Luis Province (December)

Precipitation variation in San Luis Province (December)

Merlo

In December Merlo generally has high temperatures with maximum daytime temperatures around 28°C (82°F), minimum nighttime temperatures around 15°C (59°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« November
December
January »
November
December
January
Max temperature
26°C (79°F)
28°C (82°F)
28°C (82°F)
Min temperature
12°C (54°F)
15°C (59°F)
16°C (61°F)
Monthly rainfall
114 mm (4.5 in)
123 mm (4.8 in)
128 mm (5 in)
Monthly rainy days
9 days
12 days
12 days
Weather conditions
pleasant
pleasant
pleasant
Climate in Merlo →

Potrero de los Funes

In December Potrero de los Funes generally has high temperatures with maximum daytime temperatures around 29°C (84°F), minimum nighttime temperatures around 16°C (61°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« November
December
January »
November
December
January
Max temperature
27°C (81°F)
29°C (84°F)
30°C (86°F)
Min temperature
14°C (57°F)
16°C (61°F)
18°C (64°F)
Monthly rainfall
98 mm (3.9 in)
110 mm (4.3 in)
115 mm (4.5 in)
Monthly rainy days
8 days
10 days
10 days
Weather conditions
perfect
pleasant
tolerable
Climate in Potrero de los Funes →

San Luis

In December San Luis generally has very high temperatures with maximum daytime temperatures around 31°C (88°F), minimum nighttime temperatures around 17°C (63°F) and high monthly rainfall. So on average the conditions are tolerable that month.

« November
December
January »
November
December
January
Max temperature
28°C (82°F)
31°C (88°F)
31°C (88°F)
Min temperature
15°C (59°F)
17°C (63°F)
19°C (66°F)
Monthly rainfall
89 mm (3.5 in)
101 mm (4 in)
102 mm (4 in)
Monthly rainy days
8 days
10 days
10 days
Weather conditions
perfect
tolerable
tolerable
Climate in San Luis →

Cortaderas

In December Cortaderas generally has high temperatures with maximum daytime temperatures around 27°C (81°F), minimum nighttime temperatures around 14°C (57°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« November
December
January »
November
December
January
Max temperature
25°C (77°F)
27°C (81°F)
28°C (82°F)
Min temperature
12°C (54°F)
14°C (57°F)
15°C (59°F)
Monthly rainfall
117 mm (4.6 in)
122 mm (4.8 in)
125 mm (4.9 in)
Monthly rainy days
9 days
12 days
12 days
Weather conditions
pleasant
pleasant
pleasant
Climate in Cortaderas →

Carpintería

In December Carpintería generally has high temperatures with maximum daytime temperatures around 27°C (81°F), minimum nighttime temperatures around 14°C (57°F) and high monthly rainfall. So on average the conditions are pleasant that month.

« November
December
January »
November
December
January
Max temperature
25°C (77°F)
27°C (81°F)
28°C (82°F)
Min temperature
12°C (54°F)
14°C (57°F)
16°C (61°F)
Monthly rainfall
117 mm (4.6 in)
126 mm (5 in)
130 mm (5.1 in)
Monthly rainy days
9 days
12 days
12 days
Weather conditions
pleasant
pleasant
pleasant
Climate in Carpintería →

Is your destination not in the list? Have a look at all destinations in San Luis Province, in Argentina.

In our records: Argentina December extremes

Notable December records observed across cities in Argentina in our climate database (1976 – 2026). Historic readings can vary in quality, so treat these as illustrative.

  • In our records, the warmest December day in Argentina reached 48°C (118°F) in Santiago del Estero on December 19, 1995.

Popular cities in December

Day & night temperatures, rainfall and average weather in San Luis Province in December.

City Weather Day temp Night temp Rainfall
Merlo 28°C (82°F) 15°C (59°F) 123 mm (4.8 in)
Potrero de los Funes 29°C (84°F) 16°C (61°F) 110 mm (4.3 in)
San Luis 31°C (88°F) 17°C (63°F) 101 mm (4 in)
Cortaderas 27°C (81°F) 14°C (57°F) 122 mm (4.8 in)
Carpintería 27°C (81°F) 14°C (57°F) 126 mm (5 in)
Villa Mercedes 31°C (88°F) 17°C (63°F) 103 mm (4.1 in)

San Luis Province weather in December: frequently asked questions

What is the weather like in San Luis Province, Argentina in December?

San Luis Province, Argentina typically experiences pleasant weather in December, part of the summer season. Daytime highs in Merlo average around 28°C (82°F), and temperatures drop to about 15°C (59°F) at night.

What is the average temperature in San Luis Province, Argentina in December?

Daytime temperatures in Merlo peak at roughly 28°C (82°F) in December, dropping to about 15°C (59°F) overnight.

Does San Luis Province, Argentina get a lot of rain in December?

San Luis Province, Argentina sees substantial rainfall in December. Merlo typically averages about 123 mm (4.8 in), a mix of wet and dry days, but bring an umbrella.

Is December a Good Time to Visit San Luis Province, Argentina?

In our opinion, December may not be the ideal time to visit San Luis Province, Argentina due to the typically pleasant weather in Merlo.

Generally speaking, the best visiting conditions can be found in March, April, August, September and October offering mostly perfect weather in Merlo.

Interested in more climate information?

We have much more information about the climate in San Luis Province.

Weather and climate has detailed information for every country in the world. Are you going to Argentina? Get detailed historical weather averages for many cities in Argentina.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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