Climate almanac
Half Moon Bay
California, United States · 37.46°, -122.43°
What is the weather like in Half Moon Bay in December?
In December, Half Moon Bay is typically 57°F (14°C) during the day and 50°F (10°C) at night. The month brings about 4.2 in (107 mm) of precipitation in total.
- Average high57°F (14°C)
- Average low50°F (10°C)
- Precipitation4.2 in (107 mm)
- Clear or mostly clear days8
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)