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 30, 2026
 
Today

Today: Sunny, with a high near 77. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Sunny
 Tonight

Tonight: Mostly clear, with a low around 51. Southwest wind around 6 mph.
Mostly Clear
 Wednesday

Wednesday: Mostly sunny, with a high near 74. West southwest wind 3 to 6 mph.
Mostly Sunny
 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 51. Southwest wind around 7 mph.
Partly Cloudy
 Thursday

Thursday: Mostly sunny, with a high near 71. South southwest wind 5 to 7 mph.
Mostly Sunny
 Thursday
Night
Thursday Night: Partly cloudy, with a low around 52.
Partly Cloudy
 Friday

Friday: Mostly sunny, with a high near 76.
Mostly Sunny
 Friday
Night
Friday Night: Mostly clear, with a low around 53.
Mostly Clear
 Independence
Day
Independence Day: Mostly sunny, with a high near 77.
Mostly Sunny
Hi 77 °F Lo 51 °F Hi 74 °F Lo 51 °F Hi 71 °F Lo 52 °F Hi 76 °F Lo 53 °F Hi 77 °F

 

Today
 
 Sunny, with a high near 77. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Tonight
 
 Mostly clear, with a low around 51. Southwest wind around 6 mph.
Wednesday
 
 Mostly sunny, with a high near 74. West southwest wind 3 to 6 mph.
Wednesday Night
 
 Partly cloudy, with a low around 51. Southwest wind around 7 mph.
Thursday
 
 Mostly sunny, with a high near 71. South southwest wind 5 to 7 mph.
Thursday Night
 
 Partly cloudy, with a low around 52.
Friday
 
 Mostly sunny, with a high near 76.
Friday Night
 
 Mostly clear, with a low around 53.
Independence Day
 
 Mostly sunny, with a high near 77.
Saturday Night
 
 Mostly clear, with a low around 53.
Sunday
 
 Mostly sunny, with a high near 76.
Sunday Night
 
 Partly cloudy, with a low around 53.
Monday
 
 Mostly sunny, with a high near 74.

 

Forecast from NOAA-NWS for Portola Valley CA.