10-Day Weather Forecast - Castro Valley, CA

Mostly cloudy. Patchy fog in the morning. Highs in the mid 60s. West winds 5 to 10 mph.

Partly cloudy in the evening then becoming mostly cloudy. A slight chance of showers. Lows in the lower 50s. Southwest winds 5 to 10 mph.

Mostly cloudy in the morning then becoming partly cloudy. A slight chance of showers. Highs in the 60s. Southwest winds around 5 mph. . . Becoming northwest in the afternoon. Chance of showers 20 percent.

Mostly clear in the evening then becoming mostly cloudy. Lows in the lower 50s. West winds 5 to 10 mph.

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

Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower 50s.

Mostly cloudy in the morning then becoming partly cloudy. Highs in the 60s.

Clear. Lows in the mid 40s to lower 50s.

Mostly clear. Highs in the 60s to lower 70s. Lows around 50.

Mostly clear. Highs in the 60s to lower 70s. Lows around 50.

Mostly clear. Highs in the 60s to lower 70s. Lows around 50.

Mostly clear. Highs in the 60s to lower 70s. Lows around 50.

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

Clear. Low temperature around 51F. Dew point will be around 44F with an average humidity of 67%. Winds will be 2 mph from the NW.

Sunny. High temperature around 70F. Dew point will be around 47F with an average humidity of 52%. Winds will be 4 mph from the NW.

Mostly clear. Low temperature around 52F. Dew point will be around 46F with an average humidity of 69%. Winds will be 3 mph from the NW.

Mostly sunny. High temperature around 68F. Dew point will be around 45F with an average humidity of 52%. Winds will be 6 mph from the NW.

Mostly clear. Low temperature around 49F. Dew point will be around 41F with an average humidity of 61%. Winds will be 4 mph from the NW.