National Weather Service Forecast for: Portola Valley CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:36 pm PDT Jul 12, 2026
 
Tonight

Tonight: Mostly cloudy, with a low around 62. Calm wind.
Mostly Cloudy
 Monday

Monday: Mostly cloudy, then gradually becoming sunny, with a high near 89. Light and variable wind.
Decreasing
Clouds
 Monday
Night
Monday Night: Mostly clear, with a low around 64. Calm wind.
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 91. Calm wind becoming west northwest around 5 mph in the afternoon.
Sunny
 Tuesday
Night
Tuesday Night: Clear, with a low around 60. West northwest wind around 6 mph becoming calm in the evening.
Clear
 Wednesday

Wednesday: Sunny, with a high near 85.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 54.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 78.
Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 53.
Mostly Clear
Lo 62 °F Hi 89 °F Lo 64 °F Hi 91 °F Lo 60 °F Hi 85 °F Lo 54 °F Hi 78 °F Lo 53 °F

Coastal Flood Advisory
 

Tonight
 
 Mostly cloudy, with a low around 62. Calm wind.
Monday
 
 Mostly cloudy, then gradually becoming sunny, with a high near 89. Light and variable wind.
Monday Night
 
 Mostly clear, with a low around 64. Calm wind.
Tuesday
 
 Sunny, with a high near 91. Calm wind becoming west northwest around 5 mph in the afternoon.
Tuesday Night
 
 Clear, with a low around 60. West northwest wind around 6 mph becoming calm in the evening.
Wednesday
 
 Sunny, with a high near 85.
Wednesday Night
 
 Mostly clear, with a low around 54.
Thursday
 
 Sunny, with a high near 78.
Thursday Night
 
 Mostly clear, with a low around 53.
Friday
 
 Mostly sunny, with a high near 80.
Friday Night
 
 Partly cloudy, with a low around 56.
Saturday
 
 Mostly sunny, with a high near 80.
Saturday Night
 
 Partly cloudy, with a low around 57.
Sunday
 
 Mostly sunny, with a high near 80.

 

Forecast from NOAA-NWS for Portola Valley CA.