Climate almanac
Castro Valley
California, United States · 37.69°, -122.09°
What is the weather like in Castro Valley in October?
In October, Castro Valley is typically 76°F (25°C) during the day and 52°F (11°C) at night. The month brings about 0.9 in (22 mm) of precipitation in total.
- Average high76°F (25°C)
- Average low52°F (11°C)
- Precipitation0.9 in (22 mm)
- Clear or mostly clear days19
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)