10-Day Weather Forecast - Castro Valley, CA

Sunny. Highs in the mid 60s. Northeast winds 5 to 10 mph.

Mostly clear. Lows in the mid 40s. East winds 5 to 10 mph.

Sunny. Highs in the upper 60s. Northeast winds 5 to 10 mph.

Mostly clear. Lows in the upper 40s.

Sunny. Highs in the mid 60s.

Partly cloudy. Lows in the upper 40s. Highs in the mid 60s.

Partly cloudy. Lows in the upper 40s. Highs in the mid 60s.

Mostly clear. Lows in the mid 40s. Highs in the lower 60s.

Mostly clear. Lows in the mid 40s. Highs in the lower 60s.

Partly cloudy. Lows in the mid 40s. Highs in the lower 60s.

Partly cloudy. Lows in the mid 40s. Highs in the lower 60s.

Partly cloudy. Low temperature around 43F. Dew point will be around 43F with an average humidity of 85%. Winds will be 4 mph from the E.

Partly cloudy. High temperature around 60F. Dew point will be around 45F with an average humidity of 74%. Winds will be 2 mph from the NW.

Partly cloudy. Low temperature around 41F. Dew point will be around 42F with an average humidity of 89%. Winds will be 2 mph from the N.

Cloudy. High temperature around 55F. Dew point will be around 44F with an average humidity of 77%. Winds will be 2 mph from the NW.

Mostly clear. Low temperature around 39F. Dew point will be around 40F with an average humidity of 89%. Winds will be 2 mph from the NE.

Sunny. High temperature around 55F. Dew point will be around 41F with an average humidity of 72%. Winds will be 3 mph from the N.

Clear. Low temperature around 38F. Dew point will be around 38F with an average humidity of 83%. Winds will be 3 mph from the NE.