National Weather Service Forecast for: Portola Valley CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 2:54 pm PST Dec 22, 2025
 
Tonight

Tonight: A 50 percent chance of rain. Cloudy, with a low around 51. Calm wind becoming south around 6 mph after midnight. New precipitation amounts of less than a tenth of an inch possible.
Chance Rain

 Tuesday

Tuesday: Rain likely, mainly after 10am. Cloudy, with a high near 60. South southeast wind 8 to 18 mph, with gusts as high as 34 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain Likely

 Tuesday
Night
Tuesday Night: Rain. Low around 49. Breezy, with a south wind 20 to 24 mph, with gusts as high as 50 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Rain and
Breezy

 Wednesday

Wednesday: Rain, mainly before 4pm, then showers and possibly a thunderstorm after 4pm. Some of the storms could be severe. High near 59. South wind 9 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Rain then
Severe
T-Storms
 Wednesday
Night
Wednesday Night: Showers and possibly a thunderstorm before 7pm, then rain between 7pm and 4am, then showers and possibly a thunderstorm after 4am. Some of the storms could be severe. Low around 49. Breezy, with a south southeast wind 21 to 23 mph, with gusts as high as 47 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Breezy.
Severe
T-Storms
then Showers
 Christmas
Day
Christmas Day: Showers and possibly a thunderstorm before 7am, then rain between 7am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 56. Breezy. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Showers and
Breezy

 Thursday
Night
Thursday Night: Showers and possibly a thunderstorm before 4am, then rain after 4am. Low around 46. Chance of precipitation is 100%.
Showers

 Friday

Friday: Rain before 10am, then showers and possibly a thunderstorm between 10am and 4pm, then rain likely and possibly a thunderstorm after 4pm. Cloudy, with a high near 54.
Showers

 Friday
Night
Friday Night: Rain likely, mainly before 10pm. Mostly cloudy, with a low around 42.
Rain Likely
Lo 51 °F Hi 60 °F Lo 49 °F Hi 59 °F Lo 49 °F Hi 56 °F Lo 46 °F Hi 54 °F Lo 42 °F

Flood Watch
Wind Advisory
 

Tonight
 
 A 50 percent chance of rain. Cloudy, with a low around 51. Calm wind becoming south around 6 mph after midnight. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
 
 Rain likely, mainly after 10am. Cloudy, with a high near 60. South southeast wind 8 to 18 mph, with gusts as high as 34 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday Night
 
 Rain. Low around 49. Breezy, with a south wind 20 to 24 mph, with gusts as high as 50 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Wednesday
 
 Rain, mainly before 4pm, then showers and possibly a thunderstorm after 4pm. Some of the storms could be severe. High near 59. South wind 9 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
 
 Showers and possibly a thunderstorm before 7pm, then rain between 7pm and 4am, then showers and possibly a thunderstorm after 4am. Some of the storms could be severe. Low around 49. Breezy, with a south southeast wind 21 to 23 mph, with gusts as high as 47 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Christmas Day
 
 Showers and possibly a thunderstorm before 7am, then rain between 7am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 56. Breezy. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday Night
 
 Showers and possibly a thunderstorm before 4am, then rain after 4am. Low around 46. Chance of precipitation is 100%.
Friday
 
 Rain before 10am, then showers and possibly a thunderstorm between 10am and 4pm, then rain likely and possibly a thunderstorm after 4pm. Cloudy, with a high near 54.
Friday Night
 
 Rain likely, mainly before 10pm. Mostly cloudy, with a low around 42.
Saturday
 
 A slight chance of rain before 10am. Mostly sunny, with a high near 54.
Saturday Night
 
 Mostly clear, with a low around 38.
Sunday
 
 Sunny, with a high near 55.
Sunday Night
 
 Mostly clear, with a low around 39.
Monday
 
 Sunny, with a high near 57.

 

Forecast from NOAA-NWS for Portola Valley CA.