10-Day Weather Forecast - Portola Valley, CA

Mostly cloudy. Highs in the mid 60s. Southwest winds 5 to 10 mph.

Mostly cloudy. A slight chance of rain. Lows in the lower 50s. West winds 5 to 15 mph. Chance of rain 20 percent.

Mostly cloudy. Highs in the upper 60s. West winds 5 to 10 mph.

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

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

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

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

Mostly clear in the evening then becoming partly cloudy. Lows in the lower 50s.

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

Mostly clear. Lows in the lower 50s. Highs in the 70s to lower 80s.

Mostly clear. Lows in the lower 50s. Highs in the 70s to lower 80s.

Mostly clear. Low temperature around 50F. Dew point will be around 49F with an average humidity of 76%. Winds will be 2 mph from the W.

Sunny. High temperature around 76F. Dew point will be around 54F with an average humidity of 61%. Winds will be 2 mph from the W.

Clear. Low temperature around 52F. Dew point will be around 50F with an average humidity of 74%. Winds will be 2 mph from the SE.

Sunny. High temperature around 75F. Dew point will be around 54F with an average humidity of 56%. Winds will be 2 mph from the SW.

Clear. Low temperature around 53F. Dew point will be around 49F with an average humidity of 72%. Winds will be 3 mph from the S.

Sunny. High temperature around 76F. Dew point will be around 54F with an average humidity of 54%. Winds will be 2 mph from the W.

Clear. Low temperature around 53F. Dew point will be around 49F with an average humidity of 70%. Winds will be 2 mph from the SW.