National Weather Service Forecast for: Fairfax CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 2:54 pm PST Dec 22, 2025
 
Tonight

Tonight: Rain likely. Patchy fog between 8pm and 10pm. Otherwise, cloudy, with a low around 51. Light and variable wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain Likely
and Patchy
Fog
 Tuesday

Tuesday: Rain. High near 57. South southeast wind 6 to 14 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Rain

 Tuesday
Night
Tuesday Night: Rain. Low around 48. South wind 17 to 21 mph, with gusts as high as 45 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Rain

 Wednesday

Wednesday: Rain, mainly before 4pm, then showers and possibly a thunderstorm after 4pm. High near 57. Southwest wind 6 to 11 mph becoming south southeast in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter 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 1am, then showers and possibly a thunderstorm after 1am. Some of the storms could be severe. Low around 50. South southeast wind 15 to 20 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Showers then
Severe
T-Storms
 Christmas
Day
Christmas Day: Showers and possibly a thunderstorm. High near 54. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Showers

 Thursday
Night
Thursday Night: Showers and possibly a thunderstorm before 10pm, then rain after 10pm. Low around 47. Chance of precipitation is 100%.
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 53.
Showers

 Friday
Night
Friday Night: Rain likely, mainly before 10pm. Mostly cloudy, with a low around 44.
Rain Likely
Lo 51 °F Hi 57 °F Lo 48 °F Hi 57 °F Lo 50 °F Hi 54 °F Lo 47 °F Hi 53 °F Lo 44 °F

Flood Watch
Wind Advisory
 

Tonight
 
 Rain likely. Patchy fog between 8pm and 10pm. Otherwise, cloudy, with a low around 51. Light and variable wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday
 
 Rain. High near 57. South southeast wind 6 to 14 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night
 
 Rain. Low around 48. South wind 17 to 21 mph, with gusts as high as 45 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Wednesday
 
 Rain, mainly before 4pm, then showers and possibly a thunderstorm after 4pm. High near 57. Southwest wind 6 to 11 mph becoming south southeast in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
 
 Showers and possibly a thunderstorm before 7pm, then rain between 7pm and 1am, then showers and possibly a thunderstorm after 1am. Some of the storms could be severe. Low around 50. South southeast wind 15 to 20 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Christmas Day
 
 Showers and possibly a thunderstorm. High near 54. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday Night
 
 Showers and possibly a thunderstorm before 10pm, then rain after 10pm. Low around 47. Chance of precipitation is 100%.
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 53.
Friday Night
 
 Rain likely, mainly before 10pm. Mostly cloudy, with a low around 44.
Saturday
 
 Mostly sunny, with a high near 54.
Saturday Night
 
 Mostly clear, with a low around 40.
Sunday
 
 Sunny, with a high near 53.
Sunday Night
 
 Partly cloudy, with a low around 40.
Monday
 
 Mostly sunny, with a high near 54.

 

Forecast from NOAA-NWS for Fairfax CA.