San Martín Weather in December
What's the weather like in San Martín (Mendoza) in December 2025?
The climate in San Martín during December can be summarized as hot and dry.
December is in the summer in San Martín and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a comfortable 32°C (89°F), whilst at night 16°C (61°F) is normal.
| Daytime temperature | 31.5°C 88.6°F |
|---|---|
| Nightly temperature | 16.2°C 61.1°F |
| Average temperature | 23.8°C 74.8°F |
| Daily sunshine | 11.1 hrs |
| Avg rainfall | 27 mm 1 ins |
| Rainy days | 5 days |
| Sea temperature | 17°C 62.6°F |
| Humidity | 49% |
| Windspeed | 8.3kph 5 mph |
On average December is the 3rd wettest month of the year in San Martín with around 27mm 1 inches of rain making it a dry time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.
On the flip side this corresponds to an average of 11.1 hours of sunshine per day.
December temperatures in San Martín
December rainfall
December hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in San Martín in December 2025.
Other monthly averages
Best places to visit in December
San Martín weather stats
| Hottest month: | January | 31.8°C 89.2°F |
|---|---|---|
| Driest month: | August | 3mm 0.1ins |
| Sunniest month: | November | 11hrs |
| Coldest month: | July | 15.1°C 59.2°F |
| Wettest month: | February | 38mm 1.5ins |
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