10-Day Weather Forecast - Castro Valley, CA

Mostly cloudy in the morning then becoming sunny. Highs in the 70s. Southwest winds 5 to 10 mph..becoming west 10 to 20 mph in the afternoon.

Mostly clear in the evening then becoming partly cloudy. Lows in the mid 50s. West winds 10 to 20 mph..becoming south 5 to 10 mph after midnight.

Mostly cloudy in the morning then becoming sunny. Highs in the upper 70s to mid 80s. Light winds..becoming northwest 5 to 10 mph in the afternoon.

Mostly clear. Lows in the upper 50s. West winds 10 to 15 mph..becoming southwest up to 5 mph after midnight.

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

Partly cloudy. Lows around 60.

Partly cloudy. Highs in the 70s.

Mostly clear. Lows in the upper 50s.

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

Partly cloudy. Lows in the mid 50s.

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

Mostly clear. Lows in the mid 50s.

Mostly clear. Highs in the 70s.

Clear. Low temperature around 55F. Dew point will be around 51F with an average humidity of 77%. Winds will be 6 mph from the SW.

Sunny. High temperature around 74F. Dew point will be around 52F with an average humidity of 56%. Winds will be 6 mph from the W.

Clear. Low temperature around 55F. Dew point will be around 52F with an average humidity of 72%. Winds will be 6 mph from the SW.

Sunny. High temperature around 73F. Dew point will be around 53F with an average humidity of 58%. Winds will be 6 mph from the W.

Clear. Low temperature around 55F. Dew point will be around 51F with an average humidity of 71%. Winds will be 6 mph from the SW.