Climate almanac
Alum Rock
California, United States · 37.37°, -121.83°
What is the weather like in Alum Rock in September?
In September, Alum Rock is typically 82°F (28°C) during the day and 58°F (14°C) at night. The month brings about 0.2 in (5 mm) of precipitation in total.
- Average high82°F (28°C)
- Average low58°F (14°C)
- Precipitation0.2 in (5 mm)
- Clear or mostly clear days25
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)