10-Day Weather Forecast - Castro Valley, CA

Mostly cloudy. Patchy fog in the morning. Highs in the mid 60s. Northeast winds around 5 mph.

Mostly cloudy. Lows in the upper 40s. Northeast winds up to 5 mph.

Mostly cloudy. Highs in the lower 60s. Northeast winds around 5 mph. . . Becoming northwest in the afternoon.

Mostly cloudy. Lows in the upper 40s.

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

Partly cloudy. Patchy fog. Lows in the upper 40s. Highs in the upper 50s to mid 60s.

Partly cloudy. Patchy fog. Lows in the upper 40s. Highs in the upper 50s to mid 60s.

Partly cloudy. Patchy fog. Lows in the upper 40s. Highs in the upper 50s to mid 60s.

Partly cloudy. Patchy fog. Lows in the upper 40s. Highs in the upper 50s to mid 60s.

Mostly clear in the evening then becoming partly cloudy. Lows in the mid 40s.

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

Partly cloudy. Low temperature around 46F. Dew point will be around 44F with an average humidity of 79%. Winds will be 4 mph from the NE.

Partly cloudy. High temperature around 64F. Dew point will be around 46F with an average humidity of 66%. Winds will be 4 mph from the NE.

Partly cloudy. Low temperature around 46F. Dew point will be around 43F with an average humidity of 78%. Winds will be 4 mph from the E.

Partly cloudy. High temperature around 62F. Dew point will be around 46F with an average humidity of 65%. Winds will be 3 mph from the E.

Partly cloudy. Low temperature around 47F. Dew point will be around 44F with an average humidity of 79%. Winds will be 3 mph from the E.

Cloudy with a chance of rain. Chance of precipitation 35%. High temperature around 60F. Dew point will be around 48F with an average humidity of 71%. Winds will be 3 mph from the NW.

Partly cloudy with a slight chance of rain. Chance of precipitation 25%. Low temperature around 46F. Dew point will be around 45F with an average humidity of 85%. Winds will be 3 mph from the E.