Climate almanac
San Bruno
California, United States · 37.63°, -122.41°
What is the weather like in San Bruno in September?
In September, San Bruno is typically 69°F (20°C) during the day and 58°F (14°C) at night. The month brings about 0.2 in (4 mm) of precipitation in total.
- Average high69°F (20°C)
- Average low58°F (14°C)
- Precipitation0.2 in (4 mm)
- Clear or mostly clear days15
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)