10-Day Weather Forecast - Castro Valley, CA

Mostly cloudy. A slight chance of rain in the morning. Highs in the mid 60s. Southwest winds 5 to 10 mph.

Mostly cloudy. A slight chance of rain after midnight. Lows in the lower 50s. Southwest winds 10 to 20 mph. Chance of rain 20 percent.

Partly cloudy in the morning then becoming sunny. A slight chance of rain in the morning. Highs in the mid 60s. Southwest winds 5 to 15 mph. Chance of rain 20 percent.

Mostly clear. Lows in the upper 40s.

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

Mostly clear. Lows around 50. Highs near 70.

Mostly clear. Lows around 50. Highs near 70.

Partly cloudy. Lows in the lower 50s. Highs near 70.

Partly cloudy. Lows in the lower 50s. Highs near 70.

Partly cloudy. Lows in the lower 50s. Highs near 70.

Partly cloudy. Lows in the lower 50s. Highs near 70.

Clear. Low temperature around 49F. Dew point will be around 47F with an average humidity of 80%. Winds will be 8 mph from the SW.

Sunny. High temperature around 76F. Dew point will be around 50F with an average humidity of 58%. Winds will be 9 mph from the W.

Clear. Low temperature around 49F. Dew point will be around 48F with an average humidity of 75%. Winds will be 8 mph from the W.

Sunny. High temperature around 72F. Dew point will be around 50F with an average humidity of 57%. Winds will be 10 mph from the W.

Clear. Low temperature around 49F. Dew point will be around 47F with an average humidity of 75%. Winds will be 9 mph from the W.

Mostly sunny. High temperature around 69F. Dew point will be around 49F with an average humidity of 60%. Winds will be 10 mph from the W.

Partly cloudy. Low temperature around 49F. Dew point will be around 47F with an average humidity of 76%. Winds will be 9 mph from the W.