Climate almanac
San Mateo
California, United States · 37.56°, -122.33°
What is the weather like in San Mateo in September?
In September, San Mateo is typically 76°F (24°C) during the day and 58°F (15°C) at night. The month brings about 0.1 in (4 mm) of precipitation in total.
- Average high76°F (24°C)
- Average low58°F (15°C)
- Precipitation0.1 in (4 mm)
- Clear or mostly clear days15
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)