National Weather Service Forecast for: Portola Valley CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 3:06 pm PST Nov 1, 2026
 
Tonight

Tonight: Mostly clear, with a low around 46. West wind around 5 mph becoming calm in the evening.
Mostly Clear

 Monday

Monday: Partly sunny, with a high near 66. Calm wind.
Partly Sunny

 Monday
Night
Monday Night: Showers likely, mainly after 4am. Mostly cloudy, with a low around 50. Calm wind becoming south southwest around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Mostly Cloudy
then Showers
Likely
 Tuesday

Tuesday: Showers, mainly before 4pm. High near 63. South wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Showers

 Tuesday
Night
Tuesday Night: A 30 percent chance of showers before 10pm. Partly cloudy, with a low around 49. Calm wind.
Chance
Showers then
Partly Cloudy
 Wednesday

Wednesday: Patchy fog before 7am. Otherwise, mostly sunny, with a high near 65.
Patchy Fog
then Sunny
 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 50.
Partly Cloudy

 Thursday

Thursday: Mostly sunny, with a high near 69.
Mostly Sunny

 Thursday
Night
Thursday Night: Mostly clear, with a low around 49.
Mostly Clear
Lo 46 °F Hi 66 °F Lo 50 °F Hi 63 °F Lo 49 °F Hi 65 °F Lo 50 °F Hi 69 °F Lo 49 °F

 

Tonight
 
 Mostly clear, with a low around 46. West wind around 5 mph becoming calm in the evening.
Monday
 
 Partly sunny, with a high near 66. Calm wind.
Monday Night
 
 Showers likely, mainly after 4am. Mostly cloudy, with a low around 50. Calm wind becoming south southwest around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
 
 Showers, mainly before 4pm. High near 63. South wind around 7 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
 
 A 30 percent chance of showers before 10pm. Partly cloudy, with a low around 49. Calm wind.
Wednesday
 
 Patchy fog before 7am. Otherwise, mostly sunny, with a high near 65.
Wednesday Night
 
 Partly cloudy, with a low around 50.
Thursday
 
 Mostly sunny, with a high near 69.
Thursday Night
 
 Mostly clear, with a low around 49.
Friday
 
 Sunny, with a high near 72.
Friday Night
 
 Mostly clear, with a low around 52.
Saturday
 
 Sunny, with a high near 75.
Saturday Night
 
 Partly cloudy, with a low around 53.
Sunday
 
 Mostly sunny, with a high near 74.

 

Forecast from NOAA-NWS for Portola Valley CA.