10-Day Weather Forecast - Castro Valley, CA

Partly cloudy in the morning then becoming sunny. Highs in the 70s to upper 80s. Northwest winds up to 5 mph increasing to 5 to 15 mph in the afternoon.

Mostly clear in the evening then becoming partly cloudy. Lows around 60. West winds 10 to 15 mph decreasing to up to 5 mph after midnight.

Mostly cloudy in the morning then becoming sunny. Highs in the upper 70s to mid 80s. Light winds..becoming west 5 to 15 mph in the afternoon.

Mostly clear. Lows around 60. West winds 5 to 15 mph decreasing to up to 5 mph after midnight.

Partly cloudy in the morning then becoming sunny. Highs in the 70s to upper 80s.

Mostly clear. Lows in the lower 60s.

Mostly clear. Highs in the mid 70s to upper 80s.

Mostly clear. Lows in the lower 60s.

Mostly clear. Highs in the mid 70s to upper 80s.

Mostly clear. Lows in the lower 60s.

Partly cloudy in the morning then becoming sunny. Highs in the 70s to lower 80s.

Mostly clear. Lows around 60.

Partly cloudy in the morning then becoming sunny. Highs in the 70s to lower 80s.

Clear. Low temperature around 51F. Dew point will be around 54F with an average humidity of 89%. Winds will be 8 mph from the W.

Sunny. High temperature around 74F. Dew point will be around 56F with an average humidity of 70%. Winds will be 9 mph from the W.

Mostly clear. Low temperature around 51F. Dew point will be around 54F with an average humidity of 90%. Winds will be 8 mph from the W.

Mostly sunny. High temperature around 73F. Dew point will be around 56F with an average humidity of 72%. Winds will be 9 mph from the W.

Clear. Low temperature around 51F. Dew point will be around 54F with an average humidity of 91%. Winds will be 8 mph from the W.