Climate almanac
San Mateo
California, United States · 37.56°, -122.33°
What is the weather like in San Mateo in December?
In December, San Mateo is typically 58°F (15°C) during the day and 47°F (8°C) at night. The month brings about 3.9 in (100 mm) of precipitation in total.
- Average high58°F (15°C)
- Average low47°F (8°C)
- Precipitation3.9 in (100 mm)
- Clear or mostly clear days8
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)