Mercedes Weather in December
What's the weather like in Mercedes (Buenos Aires) in December 2025?
The climate in Mercedes during December can be summarized as warm and a little damp.
December is in the summer in Mercedes and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 29°C (84°F), whilst at night 16°C (60°F) is normal.
| Daytime temperature | 28.8°C 83.8°F |
|---|---|
| Nightly temperature | 15.6°C 60.1°F |
| Average temperature | 22.2°C 72°F |
| Daily sunshine | 10.5 hrs |
| Avg rainfall | 97 mm 3.8 ins |
| Rainy days | 8 days |
| Sea temperature | 19.9°C 67.8°F |
| Humidity | 64% |
| Windspeed | 11.5kph 7 mph |
On average December is the 6th wettest month of the year in Mercedes with around 97mm 3.8 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.
On the flip side this corresponds to an average of 10.5 hours of sunshine per day.
December temperatures in Mercedes
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 Mercedes in December 2025.
Other monthly averages
Best places to visit in December
Mercedes weather stats
| Hottest month: | January | 30.1°C 86.2°F |
|---|---|---|
| Driest month: | July | 52mm 2ins |
| Sunniest month: | January | 10.4hrs |
| Coldest month: | June | 15°C 59°F |
| Wettest month: | March | 131mm 5.2ins |
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