Climate almanac
Half Moon Bay
California, United States · 37.46°, -122.43°
What is the weather like in Half Moon Bay in September?
In September, Half Moon Bay is typically 66°F (19°C) during the day and 58°F (15°C) at night. The month brings about 0.2 in (5 mm) of precipitation in total.
- Average high66°F (19°C)
- Average low58°F (15°C)
- Precipitation0.2 in (5 mm)
- Clear or mostly clear days11
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)