National Weather Service Forecast for: Foster City CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 2:54 pm PST Dec 22, 2025
 
This
Afternoon
This Afternoon: Rain likely. Cloudy, with a high near 62. West southwest wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Rain Likely
 Tonight

Tonight: A 50 percent chance of rain. Cloudy, with a low around 53. North northwest wind around 5 mph becoming calm in the evening. New precipitation amounts of less than a tenth of an inch possible.
Chance Rain
 Tuesday

Tuesday: Rain, mainly after 10am. High near 62. South southeast wind 7 to 12 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain
 Tuesday
Night
Tuesday Night: Rain. Low around 51. Breezy, with a southeast wind 22 to 24 mph, with gusts as high as 43 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Rain and
Breezy
 Wednesday

Wednesday: Rain, mainly before 4pm, then showers and possibly a thunderstorm after 4pm. High near 61. South southeast wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Showers
 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. Low around 52. Breezy. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Showers and
Breezy
 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 58. Breezy. Chance of precipitation is 100%.
Showers and
Breezy
 Thursday
Night
Thursday Night: Showers and possibly a thunderstorm before 10pm, then rain after 10pm. Cloudy, with a low around 48.
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 57.
Showers
Hi 62 °F Lo 53 °F Hi 62 °F Lo 51 °F Hi 61 °F Lo 52 °F Hi 58 °F Lo 48 °F Hi 57 °F

High Wind Watch
Flood Watch
 

This Afternoon
 
 Rain likely. Cloudy, with a high near 62. West southwest wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
 
 A 50 percent chance of rain. Cloudy, with a low around 53. North northwest wind around 5 mph becoming calm in the evening. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
 
 Rain, mainly after 10am. High near 62. South southeast wind 7 to 12 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday Night
 
 Rain. Low around 51. Breezy, with a southeast wind 22 to 24 mph, with gusts as high as 43 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Wednesday
 
 Rain, mainly before 4pm, then showers and possibly a thunderstorm after 4pm. High near 61. South southeast wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts of less than a tenth 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. Low around 52. Breezy. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an 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 58. Breezy. Chance of precipitation is 100%.
Thursday Night
 
 Showers and possibly a thunderstorm before 10pm, then rain after 10pm. Cloudy, with a low around 48.
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 57.
Friday Night
 
 Rain likely, mainly before 10pm. Mostly cloudy, with a low around 45.
Saturday
 
 A slight chance of rain. Mostly sunny, with a high near 56.
Saturday Night
 
 Mostly clear, with a low around 41.
Sunday
 
 Sunny, with a high near 56.
Sunday Night
 
 Mostly clear, with a low around 42.
Monday
 
 Sunny, with a high near 57.

 

Forecast from NOAA-NWS for Foster City CA.