San Luis Weather in December
What's the weather like in San Luis (Santa Bárbara) in December 2025?
The climate in San Luis during December can be summarized as warm, humid and a little damp.
December is in the winter in San Luis and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a muggy 24°C (76°F), whilst at night 16°C (61°F) is normal.
| Daytime temperature | 24.3°C 75.7°F |
|---|---|
| Nightly temperature | 16.1°C 61°F |
| Average temperature | 20.2°C 68.4°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 100 mm 3.9 ins |
| Rainy days | 15 days |
| Sea temperature | 27.8°C 82.1°F |
| Humidity | 84% |
| Windspeed | 18kph 11 mph |
On average December is the 5th driest month of the year in San Luis with around 100mm 3.9 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 15 days, although this may vary considerably.
On the flip side this corresponds to an average of 6 hours of sunshine per day.
December temperatures in San Luis
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 Luis in December 2025.
Other monthly averages
Best places to visit in December
San Luis weather stats
| Hottest month: | May | 29.7°C 85.5°F |
|---|---|---|
| Driest month: | March | 38mm 1.5ins |
| Sunniest month: | March | 8.1hrs |
| Coldest month: | January | 24°C 75.2°F |
| Wettest month: | September | 372mm 14.6ins |
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