National Weather Service Forecast for: Portola Valley CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:25 am PST Dec 22, 2025
 
Overnight

Overnight: Rain. Low around 53. South wind around 9 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain
 Monday

Monday: Rain. Patchy fog after noon. High near 59. South wind 6 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Rain and
Patchy Fog
 Monday
Night
Monday Night: Rain. Areas of fog. Low around 51. South wind around 6 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain and
Areas Fog
 Tuesday

Tuesday: Rain. Patchy fog before 7am. High near 59. South southeast wind 10 to 17 mph, with gusts as high as 37 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Rain and
Patchy Fog
 Tuesday
Night
Tuesday Night: Rain. Low around 48. Breezy, with a south wind 22 to 28 mph, with gusts as high as 50 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Rain and
Breezy
 Wednesday

Wednesday: Rain. Patchy fog before 11am. High near 58. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Rain and
Patchy Fog
 Wednesday
Night
Wednesday Night: Rain. Low around 49. Chance of precipitation is 100%.
Rain
 Christmas
Day
Christmas Day: Rain. Cloudy, with a high near 56.
Rain
 Thursday
Night
Thursday Night: Showers and possibly a thunderstorm before 4am, then rain and possibly a thunderstorm after 4am. Cloudy, with a low around 46.
Showers
Lo 53 °F Hi 59 °F Lo 51 °F Hi 59 °F Lo 48 °F Hi 58 °F Lo 49 °F Hi 56 °F Lo 46 °F

High Wind Watch
Flood Watch
 

Overnight
 
 Rain. Low around 53. South wind around 9 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
 
 Rain. Patchy fog after noon. High near 59. South wind 6 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Monday Night
 
 Rain. Areas of fog. Low around 51. South wind around 6 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday
 
 Rain. Patchy fog before 7am. High near 59. South southeast wind 10 to 17 mph, with gusts as high as 37 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night
 
 Rain. Low around 48. Breezy, with a south wind 22 to 28 mph, with gusts as high as 50 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Wednesday
 
 Rain. Patchy fog before 11am. High near 58. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday Night
 
 Rain. Low around 49. Chance of precipitation is 100%.
Christmas Day
 
 Rain. Cloudy, with a high near 56.
Thursday Night
 
 Showers and possibly a thunderstorm before 4am, then rain and possibly a thunderstorm after 4am. Cloudy, with a low around 46.
Friday
 
 Rain, mainly before 4pm. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 55.
Friday Night
 
 A chance of rain. Partly cloudy, with a low around 40.
Saturday
 
 A slight chance of rain. Patchy fog. Otherwise, mostly sunny, with a high near 54.
Saturday Night
 
 Mostly clear, with a low around 39.
Sunday
 
 Patchy fog. Otherwise, mostly sunny, with a high near 55.

 

Forecast from NOAA-NWS for Portola Valley CA.