National Weather Service Forecast for: Portola Valley CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:26 am PDT Jun 22, 2026
 
Overnight

Overnight: Partly cloudy, with a low around 52. Calm wind.
Partly Cloudy
 Monday

Monday: Sunny, with a high near 77. Calm wind becoming west southwest around 6 mph in the afternoon.
Sunny
 Monday
Night
Monday Night: Mostly clear, with a low around 53. Light southwest wind.
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 80. Calm wind becoming west around 5 mph in the afternoon.
Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 54. Light and variable wind.
Mostly Clear
 Wednesday

Wednesday: Sunny, with a high near 82.
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 52.
Mostly Clear
Lo 52 °F Hi 77 °F Lo 53 °F Hi 80 °F Lo 54 °F Hi 82 °F Lo 54 °F Hi 78 °F Lo 52 °F

 

Overnight
 
 Partly cloudy, with a low around 52. Calm wind.
Monday
 
 Sunny, with a high near 77. Calm wind becoming west southwest around 6 mph in the afternoon.
Monday Night
 
 Mostly clear, with a low around 53. Light southwest wind.
Tuesday
 
 Sunny, with a high near 80. Calm wind becoming west around 5 mph in the afternoon.
Tuesday Night
 
 Mostly clear, with a low around 54. Light and variable wind.
Wednesday
 
 Sunny, with a high near 82.
Wednesday Night
 
 Mostly clear, with a low around 54.
Thursday
 
 Sunny, with a high near 78.
Thursday Night
 
 Mostly clear, with a low around 52.
Friday
 
 Mostly sunny, with a high near 73.
Friday Night
 
 Partly cloudy, with a low around 55.
Saturday
 
 Mostly sunny, with a high near 70.
Saturday Night
 
 Mostly clear, with a low around 50.
Sunday
 
 Sunny, with a high near 79.

 

Forecast from NOAA-NWS for Portola Valley CA.