10-Day Weather Forecast - Castro Valley, CA

Mostly cloudy in the morning then becoming sunny. Highs in the upper 60s to mid 70s. Light winds. . . Becoming west 10 to 20 mph in the afternoon.

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

Mostly cloudy in the morning then becoming sunny. Highs in the upper 60s to mid 70s. Southwest winds up to 5 mph increasing to west 10 to 20 mph in the afternoon.

Mostly clear in the evening then becoming mostly cloudy. Lows in the mid 50s.

Mostly cloudy in the morning then becoming sunny. Highs in the 70s.

Clear in the evening then becoming partly cloudy. Lows in the upper 50s.

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

Mostly clear. Lows in the upper 50s.

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

Mostly clear. Lows in the upper 50s.

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

Mostly clear. Low temperature around 56F. Dew point will be around 53F with an average humidity of 80%. Winds will be 9 mph from the SW.

Sunny. High temperature around 76F. Dew point will be around 55F with an average humidity of 63%. Winds will be 10 mph from the W.

Clear. Low temperature around 56F. Dew point will be around 54F with an average humidity of 81%. Winds will be 9 mph from the W.

Sunny. High temperature around 73F. Dew point will be around 56F with an average humidity of 65%. Winds will be 9 mph from the W.

Clear. Low temperature around 56F. Dew point will be around 54F with an average humidity of 83%. Winds will be 9 mph from the W.

Sunny. High temperature around 72F. Dew point will be around 56F with an average humidity of 66%. Winds will be 9 mph from the W.

Clear. Low temperature around 56F. Dew point will be around 55F with an average humidity of 84%. Winds will be 9 mph from the W.