National Weather Service Forecast for: Portola Valley CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 11:26 am PDT May 26, 2026
 
This
Afternoon
This Afternoon: Mostly sunny, with a high near 62. West northwest wind 13 to 15 mph, with gusts as high as 32 mph.
Mostly Sunny

 Tonight

Tonight: Mostly cloudy, with a low around 47. West northwest wind 12 to 17 mph becoming light west after midnight. Winds could gust as high as 36 mph.
Mostly Cloudy

 Wednesday

Wednesday: Mostly sunny, with a high near 67. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Mostly Sunny

 Wednesday
Night
Wednesday Night: A 20 percent chance of rain after 4am. Mostly cloudy, with a low around 48. West southwest wind around 5 mph becoming calm in the evening.
Mostly Cloudy
then Slight
Chance Rain
 Thursday

Thursday: A 40 percent chance of rain, mainly before 11am. Partly sunny, with a high near 68. Calm wind becoming west southwest around 5 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible.
Chance Rain

 Thursday
Night
Thursday Night: Partly cloudy, with a low around 49.
Partly Cloudy

 Friday

Friday: Mostly sunny, with a high near 66.
Mostly Sunny

 Friday
Night
Friday Night: Partly cloudy, with a low around 49.
Partly Cloudy

 Saturday

Saturday: Mostly sunny, with a high near 66.
Mostly Sunny
Hi 62 °F Lo 47 °F Hi 67 °F Lo 48 °F Hi 68 °F Lo 49 °F Hi 66 °F Lo 49 °F Hi 66 °F

 

This Afternoon
 
 Mostly sunny, with a high near 62. West northwest wind 13 to 15 mph, with gusts as high as 32 mph.
Tonight
 
 Mostly cloudy, with a low around 47. West northwest wind 12 to 17 mph becoming light west after midnight. Winds could gust as high as 36 mph.
Wednesday
 
 Mostly sunny, with a high near 67. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Wednesday Night
 
 A 20 percent chance of rain after 4am. Mostly cloudy, with a low around 48. West southwest wind around 5 mph becoming calm in the evening.
Thursday
 
 A 40 percent chance of rain, mainly before 11am. Partly sunny, with a high near 68. Calm wind becoming west southwest around 5 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
 
 Partly cloudy, with a low around 49.
Friday
 
 Mostly sunny, with a high near 66.
Friday Night
 
 Partly cloudy, with a low around 49.
Saturday
 
 Mostly sunny, with a high near 66.
Saturday Night
 
 Mostly clear, with a low around 45.
Sunday
 
 Sunny, with a high near 74.
Sunday Night
 
 Clear, with a low around 48.
Monday
 
 Sunny, with a high near 77.

 

Forecast from NOAA-NWS for Portola Valley CA.