National Weather Service Forecast for: Napa CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 12:27 am PST Dec 20, 2025
 
Overnight

Overnight: Rain likely, mainly before 4am. Patchy fog after 2am. Otherwise, cloudy, with a low around 53. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Rain Likely
and Patchy
Fog
 Saturday

Saturday: Rain, mainly after 10am. Areas of dense fog before 11am. High near 56. Light and variable wind. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Rain and
Areas Dense
Fog
 Saturday
Night
Saturday Night: Rain. Steady temperature around 56. South southwest wind 5 to 7 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Rain

 Sunday

Sunday: Rain. High near 57. South southwest wind 8 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Rain

 Sunday
Night
Sunday Night: Rain. Low around 50. South southwest wind 6 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Rain

 Monday

Monday: Rain. High near 54. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Rain

 Monday
Night
Monday Night: Rain. Low around 48. Chance of precipitation is 90%.
Rain

 Tuesday

Tuesday: Rain. Cloudy, with a high near 54.
Rain

 Tuesday
Night
Tuesday Night: Rain. Cloudy, with a low around 45.
Rain
Lo 53 °F Hi 56 °F Lo 56 °F Hi 57 °F Lo 50 °F Hi 54 °F Lo 48 °F Hi 54 °F Lo 45 °F

Flood Watch
 

Overnight
 
 Rain likely, mainly before 4am. Patchy fog after 2am. Otherwise, cloudy, with a low around 53. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
 
 Rain, mainly after 10am. Areas of dense fog before 11am. High near 56. Light and variable wind. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Saturday Night
 
 Rain. Steady temperature around 56. South southwest wind 5 to 7 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Sunday
 
 Rain. High near 57. South southwest wind 8 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Sunday Night
 
 Rain. Low around 50. South southwest wind 6 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Monday
 
 Rain. High near 54. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Monday Night
 
 Rain. Low around 48. Chance of precipitation is 90%.
Tuesday
 
 Rain. Cloudy, with a high near 54.
Tuesday Night
 
 Rain. Cloudy, with a low around 45.
Wednesday
 
 Rain. Mostly cloudy, with a high near 52.
Wednesday Night
 
 Rain. Cloudy, with a low around 47.
Christmas Day
 
 Rain. Cloudy, with a high near 51.
Thursday Night
 
 Rain. Mostly cloudy, with a low around 42.
Friday
 
 Rain likely. Mostly cloudy, with a high near 52.

 

Forecast from NOAA-NWS for Napa CA.