10-Day Weather Forecast - Castro Valley, CA

Sunny. Highs in the 80s. Light winds..becoming northwest 5 to 10 mph in the afternoon.

Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid 60s. West winds 5 to 10 mph in the evening..becoming light.

Mostly cloudy in the morning then becoming partly cloudy. Highs in the upper 80s to mid 90s. Light winds..becoming northwest 5 to 10 mph in the afternoon.

Partly cloudy in the evening then becoming mostly clear. Lows in the mid 60s to lower 70s.

Mostly clear. Highs in the 80s.

Mostly clear. Lows in the lower 60s.

Mostly clear. Highs in the 70s to lower 80s.

Mostly clear. Lows around 60.

Partly cloudy in the morning then becoming sunny. Highs in the 60s to upper 70s.

Mostly clear. Lows in the upper 50s.

Partly cloudy in the morning then becoming sunny. Highs in the 60s to upper 70s.

Mostly clear. Low temperature around 56F. Dew point will be around 51F with an average humidity of 72%. Winds will be 7 mph from the SW.

Sunny. High temperature around 79F. Dew point will be around 53F with an average humidity of 58%. Winds will be 8 mph from the W.

Mostly clear. Low temperature around 56F. Dew point will be around 55F with an average humidity of 81%. Winds will be 6 mph from the SW.

Partly cloudy. High temperature around 74F. Dew point will be around 54F with an average humidity of 61%. Winds will be 8 mph from the W.

Clear. Low temperature around 55F. Dew point will be around 55F with an average humidity of 82%. Winds will be 6 mph from the W.

Sunny. High temperature around 75F. Dew point will be around 54F with an average humidity of 59%. Winds will be 8 mph from the W.

Clear. Low temperature around 56F. Dew point will be around 55F with an average humidity of 81%. Winds will be 6 mph from the W.