10-Day Weather Forecast - Castro Valley, CA

Mostly cloudy in the morning then becoming partly cloudy. Highs in the upper 60s to mid 70s. West winds 5 to 10 mph increasing to 10 to 20 mph in the afternoon.

Partly cloudy in the evening then becoming mostly cloudy. Lows in the upper 50s. West winds 10 to 20 mph. . . Becoming 5 to 10 mph after midnight.

Mostly cloudy in the morning then becoming sunny. Highs in the upper 60s to mid 70s. Southwest winds 5 to 10 mph. . . Becoming west 10 to 20 mph in the afternoon.

Mostly clear in the evening then becoming mostly cloudy. Lows in the mid 50s. West winds 10 to 20 mph.

Mostly cloudy in the morning then becoming partly cloudy. Highs in the mid 60s to lower 70s.

Partly cloudy. Lows in the mid 50s. Highs in the 60s to mid 70s.

Partly cloudy. Lows in the mid 50s. Highs in the 60s to mid 70s.

Mostly clear. Lows in the upper 50s.

Partly cloudy in the morning then becoming sunny. Highs in the 60s to upper 70s.

Mostly clear in the evening then becoming partly cloudy. Lows in the mid 50s.

Partly cloudy. Highs in the mid 60s to upper 70s.

Mostly clear in the evening then becoming partly cloudy. Lows in the upper 50s.

Mostly cloudy in the morning then becoming partly cloudy. Highs in the mid 60s to upper 70s.

Clear. Low temperature around 59F. Dew point will be around 53F with an average humidity of 74%. Winds will be 8 mph from the W.

Sunny. High temperature around 75F. Dew point will be around 56F with an average humidity of 61%. Winds will be 9 mph from the W.

Mostly clear. Low temperature around 60F. Dew point will be around 53F with an average humidity of 70%. Winds will be 8 mph from the SW.

Sunny. High temperature around 79F. Dew point will be around 58F with an average humidity of 58%. Winds will be 9 mph from the W.

Mostly clear. Low temperature around 62F. Dew point will be around 54F with an average humidity of 65%. Winds will be 8 mph from the SW.