10-Day Weather Forecast - Portola Valley, CA

Mostly cloudy. Highs in the 70s. Light winds. . . Becoming west 5 to 10 mph in the afternoon.

Mostly cloudy. A chance of rain after midnight. Lows in the mid 50s. West winds 5 to 10 mph. Chance of rain 30 percent.

Mostly cloudy. A chance of rain. Highs in the upper 60s. Southwest winds 5 to 10 mph. Chance of rain 40 percent.

Mostly cloudy. A chance of rain. Lows in the lower 50s.

Mostly cloudy. A chance of rain. Highs in the upper 60s. Lows around 50.

Mostly cloudy. A chance of rain. Highs in the upper 60s. Lows around 50.

Mostly cloudy in the morning then becoming sunny. A chance of rain. Highs in the mid 60s.

Clear. Lows in the 40s to lower 50s. Highs in the 70s to lower 80s.

Clear. Lows in the 40s to lower 50s. Highs in the 70s to lower 80s.

Clear. Lows in the 40s to lower 50s. Highs in the 70s to lower 80s.

Clear. Lows in the 40s to lower 50s. Highs in the 70s to lower 80s.

Mostly clear. Low temperature around 44F. Dew point will be around 44F with an average humidity of 71%. Winds will be 2 mph from the S.

Sunny. High temperature around 75F. Dew point will be around 46F with an average humidity of 52%. Winds will be 3 mph from the W.

Clear. Low temperature around 42F. Dew point will be around 46F with an average humidity of 86%. Winds will be 3 mph from the SW.

Sunny. High temperature around 71F. Dew point will be around 47F with an average humidity of 59%. Winds will be 4 mph from the W.

Clear. Low temperature around 40F. Dew point will be around 46F with an average humidity of 90%. Winds will be 3 mph from the SW.

Sunny. High temperature around 69F. Dew point will be around 47F with an average humidity of 62%. Winds will be 5 mph from the W.

Clear. Low temperature around 39F. Dew point will be around 44F with an average humidity of 89%. Winds will be 4 mph from the W.