Climate almanac
Castro Valley
California, United States · 37.69°, -122.09°
What is the weather like in Castro Valley in April?
In April, Castro Valley is typically 69°F (21°C) during the day and 48°F (9°C) at night. The month brings about 1.1 in (27 mm) of precipitation in total.
- Average high69°F (21°C)
- Average low48°F (9°C)
- Precipitation1.1 in (27 mm)
- Clear or mostly clear days13
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)