National Weather Service Forecast for: Foster City 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 after 9pm. Otherwise, mostly cloudy, with a low around 47. West wind around 5 mph becoming calm in the evening.
Patchy Dense
Fog

 Thursday

Thursday: A 10 percent chance of rain after 4pm. Areas of dense fog before 10am. Otherwise, partly sunny, with a high near 61. Light and variable wind.
Areas Dense
Fog then
Slight Chance
Rain
 Thursday
Night
Thursday Night: A 30 percent chance of rain, mainly after 10pm. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 50. Calm wind.
Chance Rain
and Patchy
Fog
 Friday

Friday: Rain, mainly after 10am. High near 63. South wind 5 to 10 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Rain

 Friday
Night
Friday Night: Rain, mainly before 4am. Low around 54. South wind 6 to 9 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain then
Rain Likely

 Saturday

Saturday: Rain, mainly after 10am. High near 61. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain

 Saturday
Night
Saturday Night: Rain before 10pm, then showers and possibly a thunderstorm after 10pm. Low around 54. Chance of precipitation is 90%.
Showers

 Sunday

Sunday: Showers and possibly a thunderstorm before 10am, then rain after 10am. Cloudy, with a high near 61.
Showers

 Sunday
Night
Sunday Night: Rain. Cloudy, with a low around 53.
Rain
Lo 47 °F Hi 61 °F Lo 50 °F Hi 63 °F Lo 54 °F Hi 61 °F Lo 54 °F Hi 61 °F Lo 53 °F

 

Tonight
 
 Patchy dense fog after 9pm. Otherwise, mostly cloudy, with a low around 47. West wind around 5 mph becoming calm in the evening.
Thursday
 
 A 10 percent chance of rain after 4pm. Areas of dense fog before 10am. Otherwise, partly sunny, with a high near 61. Light and variable wind.
Thursday Night
 
 A 30 percent chance of rain, mainly after 10pm. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 50. Calm wind.
Friday
 
 Rain, mainly after 10am. High near 63. South wind 5 to 10 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
 
 Rain, mainly before 4am. Low around 54. South wind 6 to 9 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
 
 Rain, mainly after 10am. High near 61. 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. Low around 54. Chance of precipitation is 90%.
Sunday
 
 Showers and possibly a thunderstorm before 10am, then rain after 10am. Cloudy, with a high near 61.
Sunday Night
 
 Rain. Cloudy, with a low around 53.
Monday
 
 Rain likely. Cloudy, with a high near 60.
Monday Night
 
 Rain likely. Mostly cloudy, with a low around 50.
Tuesday
 
 Rain likely. Mostly cloudy, with a high near 58.
Tuesday Night
 
 Rain. Mostly cloudy, with a low around 50.
Wednesday
 
 Rain likely. Mostly cloudy, with a high near 59.

 

Forecast from NOAA-NWS for Foster City CA.