10-Day Weather Forecast - Castro Valley, CA

Breezy. Rain in the morning then showers and a slight chance of thunderstorms in the afternoon. Highs in the lower 60s. South winds 10 to 20 mph increasing to 20 to 30 mph in the afternoon.

Breezy rain. Lows in the mid 50s. South winds 20 to 30 mph decreasing to 10 to 20 mph after midnight.

Rain. Highs in the upper 50s. South winds 5 to 10 mph. . . Becoming southwest in the afternoon.

Rain. Lows in the lower 50s. Northwest winds 5 to 10 mph. . . Becoming north after midnight.

Rain. Highs in the upper 50s.

Breezy rain. Lows in the lower 50s.

Rain likely. Highs in the upper 50s.

Breezy rain. Lows around 50. Highs in the mid 50s.

Breezy rain. Lows around 50. Highs in the mid 50s.

Breezy rain. Lows around 50. Highs in the mid 50s.

Rain likely. Highs in the mid 50s.

Mostly cloudy. A chance of rain. Lows in the mid 40s.

Mostly cloudy in the morning then becoming partly cloudy. A slight chance of rain. Highs in the upper 50s.

Clear. Low temperature around 43F. Dew point will be around 39F with an average humidity of 83%. Winds will be 4 mph from the SE.

Sunny. High temperature around 51F. Dew point will be around 42F with an average humidity of 78%. Winds will be 4 mph from the E.

Clear. Low temperature around 42F. Dew point will be around 37F with an average humidity of 75%. Winds will be 4 mph from the SE.

Mostly sunny. High temperature around 51F. Dew point will be around 40F with an average humidity of 73%. Winds will be 3 mph from the SE.

Partly cloudy. Low temperature around 44F. Dew point will be around 37F with an average humidity of 73%. Winds will be 4 mph from the SE.