National Weather Service Forecast for: 3 Miles WNW Portola Valley CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:24 pm PST Dec 17, 2025
 
Tonight

Tonight: Patchy dense fog. Otherwise, partly cloudy, with a low around 44. Calm wind.
Patchy Dense
Fog
 Thursday

Thursday: Areas of dense fog before 9am. Otherwise, mostly sunny, with a high near 60. Calm wind.
Areas Dense
Fog then
Mostly Sunny
 Thursday
Night
Thursday Night: A 30 percent chance of rain, mainly after 10pm. Patchy fog after 1am. Otherwise, mostly cloudy, with a steady temperature around 51. Calm wind.
Chance Rain
and Patchy
Fog
 Friday

Friday: Rain, mainly after 10am. Widespread fog, mainly before 7am. High near 60. Calm wind becoming south southwest around 6 mph in the morning. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Rain and Fog

 Friday
Night
Friday Night: Rain, mainly before 4am. Patchy fog after 4am. Low around 51. South southwest wind 3 to 6 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Rain and
Patchy Fog
 Saturday

Saturday: Rain, mainly after 10am. Patchy fog before 10am, then patchy fog after 4pm. High near 60. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain and
Patchy Fog
 Saturday
Night
Saturday Night: Rain before 10pm, then showers and possibly a thunderstorm after 10pm. Patchy fog before 7pm. Low around 52. Chance of precipitation is 90%.
Showers and
Patchy Fog
 Sunday

Sunday: Showers and possibly a thunderstorm. Cloudy, with a high near 58.
Showers

 Sunday
Night
Sunday Night: Rain. Cloudy, with a low around 50.
Rain
Lo 44 °F Hi 60 °F Lo 51 °F Hi 60 °F Lo 51 °F Hi 60 °F Lo 52 °F Hi 58 °F Lo 50 °F

 

Tonight
 
 Patchy dense fog. Otherwise, partly cloudy, with a low around 44. Calm wind.
Thursday
 
 Areas of dense fog before 9am. Otherwise, mostly sunny, with a high near 60. Calm wind.
Thursday Night
 
 A 30 percent chance of rain, mainly after 10pm. Patchy fog after 1am. Otherwise, mostly cloudy, with a steady temperature around 51. Calm wind.
Friday
 
 Rain, mainly after 10am. Widespread fog, mainly before 7am. High near 60. Calm wind becoming south southwest around 6 mph in the morning. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
 
 Rain, mainly before 4am. Patchy fog after 4am. Low around 51. South southwest wind 3 to 6 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
 
 Rain, mainly after 10am. Patchy fog before 10am, then patchy fog after 4pm. High near 60. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
 
 Rain before 10pm, then showers and possibly a thunderstorm after 10pm. Patchy fog before 7pm. Low around 52. Chance of precipitation is 90%.
Sunday
 
 Showers and possibly a thunderstorm. Cloudy, with a high near 58.
Sunday Night
 
 Rain. Cloudy, with a low around 50.
Monday
 
 Rain likely. Cloudy, with a high near 57.
Monday Night
 
 Rain likely. Mostly cloudy, with a low around 47.
Tuesday
 
 Rain likely. Mostly cloudy, with a high near 56.
Tuesday Night
 
 Rain. Mostly cloudy, with a low around 47.
Wednesday
 
 Rain likely. Mostly cloudy, with a high near 56.

 

Forecast from NOAA-NWS for 3 Miles WNW Portola Valley CA.