National Weather Service Forecast for: San Mateo 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, mostly cloudy, with a low around 46. Calm wind.
Patchy Dense
Fog
 Thursday

Thursday: Widespread dense fog, mainly before 9am. Otherwise, partly sunny, with a high near 61. Light and variable wind.
Dense Fog
then Mostly
Sunny
 Thursday
Night
Thursday Night: A 40 percent chance of rain. 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 53. South wind 6 to 9 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth 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 53. 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 52.
Rain
Lo 46 °F Hi 61 °F Lo 50 °F Hi 63 °F Lo 53 °F Hi 61 °F Lo 53 °F Hi 61 °F Lo 52 °F

 

Tonight
 
 Patchy dense fog. Otherwise, mostly cloudy, with a low around 46. Calm wind.
Thursday
 
 Widespread dense fog, mainly before 9am. Otherwise, partly sunny, with a high near 61. Light and variable wind.
Thursday Night
 
 A 40 percent chance of rain. 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 53. South wind 6 to 9 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth 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 53. 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 52.
Monday
 
 Rain likely. Mostly cloudy, with a high near 59.
Monday Night
 
 Rain likely. Mostly cloudy, with a low around 48.
Tuesday
 
 Rain likely. Mostly cloudy, with a high near 58.
Tuesday Night
 
 Rain. Cloudy, with a low around 49.
Wednesday
 
 Rain. Cloudy, with a high near 58.

 

Forecast from NOAA-NWS for San Mateo CA.