National Weather Service Forecast for: 6 Miles SW Portola Valley CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 8:46 pm PDT Sep 12, 2026
 
Tonight

Tonight: Partly cloudy, with a steady temperature around 56. West northwest wind 3 to 8 mph. Winds could gust as high as 20 mph.
Partly Cloudy

 Sunday

Sunday: Sunny, with a high near 65. West northwest wind 5 to 11 mph, with gusts as high as 22 mph.
Sunny

 Sunday
Night
Sunday Night: Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 50. Northwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 23 mph.
Mostly Cloudy
then Patchy
Fog
 Monday

Monday: Areas of fog before 8am. Otherwise, mostly sunny, with a high near 75. Calm wind becoming west northwest 5 to 7 mph in the afternoon.
Areas Fog
then Sunny
 Monday
Night
Monday Night: Patchy fog after 9pm. Otherwise, partly cloudy, with a low around 50. West northwest wind around 5 mph becoming calm in the evening.
Patchy Fog

 Tuesday

Tuesday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 72.
Patchy Fog
then Sunny
 Tuesday
Night
Tuesday Night: Patchy fog between 9pm and 4am. Otherwise, mostly cloudy, with a low around 51.
Patchy Fog

 Wednesday

Wednesday: Patchy fog before 7am. Otherwise, mostly sunny, with a high near 72.
Patchy Fog
then Sunny
 Wednesday
Night
Wednesday Night: Patchy fog between 9pm and 1am. Otherwise, mostly cloudy, with a low around 52.
Patchy Fog
Lo 56 °F Hi 65 °F Lo 50 °F Hi 75 °F Lo 50 °F Hi 72 °F Lo 51 °F Hi 72 °F Lo 52 °F

 

Tonight
 
 Partly cloudy, with a steady temperature around 56. West northwest wind 3 to 8 mph. Winds could gust as high as 20 mph.
Sunday
 
 Sunny, with a high near 65. West northwest wind 5 to 11 mph, with gusts as high as 22 mph.
Sunday Night
 
 Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 50. Northwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 23 mph.
Monday
 
 Areas of fog before 8am. Otherwise, mostly sunny, with a high near 75. Calm wind becoming west northwest 5 to 7 mph in the afternoon.
Monday Night
 
 Patchy fog after 9pm. Otherwise, partly cloudy, with a low around 50. West northwest wind around 5 mph becoming calm in the evening.
Tuesday
 
 Patchy fog before 9am. Otherwise, mostly sunny, with a high near 72.
Tuesday Night
 
 Patchy fog between 9pm and 4am. Otherwise, mostly cloudy, with a low around 51.
Wednesday
 
 Patchy fog before 7am. Otherwise, mostly sunny, with a high near 72.
Wednesday Night
 
 Patchy fog between 9pm and 1am. Otherwise, mostly cloudy, with a low around 52.
Thursday
 
 Mostly sunny, with a high near 74.
Thursday Night
 
 Partly cloudy, with a low around 52.
Friday
 
 Mostly sunny, with a high near 74.
Friday Night
 
 Mostly cloudy, with a low around 52.
Saturday
 
 Partly sunny, with a high near 71.

 

Forecast from NOAA-NWS for 6 Miles SW Portola Valley CA.