National Weather Service Forecast for: Napa CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 9:46 am PDT May 4, 2026
 
Today

Today: A 30 percent chance of rain, mainly between 3pm and 5pm. Mostly cloudy, with a high near 64. Calm wind becoming west southwest 5 to 8 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible.
Mostly Cloudy
then Chance
Rain
 Tonight

Tonight: Rain, mainly before 2am. Low around 51. West southwest wind around 6 mph becoming calm after midnight. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Rain

 Tuesday

Tuesday: Patchy fog before 10am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 67. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Patchy Fog
then Partly
Sunny
 Tuesday
Night
Tuesday Night: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 50. West southwest wind 5 to 7 mph becoming calm in the evening.
Partly Cloudy
then Patchy
Fog
 Wednesday

Wednesday: Areas of fog before 10am. Otherwise, mostly sunny, with a high near 74. Calm wind becoming southwest around 6 mph in the afternoon.
Areas Fog
then Sunny
 Wednesday
Night
Wednesday Night: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 50.
Mostly Clear
then Patchy
Fog
 Thursday

Thursday: Areas of fog before 10am. Otherwise, mostly sunny, with a high near 75.
Areas Fog
then Sunny
 Thursday
Night
Thursday Night: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 48.
Mostly Clear
then Patchy
Fog
 Friday

Friday: Patchy fog before 8am. Otherwise, sunny, with a high near 79.
Patchy Fog
then Sunny
Hi 64 °F Lo 51 °F Hi 67 °F Lo 50 °F Hi 74 °F Lo 50 °F Hi 75 °F Lo 48 °F Hi 79 °F

 

Today
 
 A 30 percent chance of rain, mainly between 3pm and 5pm. Mostly cloudy, with a high near 64. Calm wind becoming west southwest 5 to 8 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible.
Tonight
 
 Rain, mainly before 2am. Low around 51. West southwest wind around 6 mph becoming calm after midnight. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
 
 Patchy fog before 10am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 67. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Tuesday Night
 
 Patchy fog after 2am. Otherwise, partly cloudy, with a low around 50. West southwest wind 5 to 7 mph becoming calm in the evening.
Wednesday
 
 Areas of fog before 10am. Otherwise, mostly sunny, with a high near 74. Calm wind becoming southwest around 6 mph in the afternoon.
Wednesday Night
 
 Patchy fog after 2am. Otherwise, partly cloudy, with a low around 50.
Thursday
 
 Areas of fog before 10am. Otherwise, mostly sunny, with a high near 75.
Thursday Night
 
 Patchy fog after 5am. Otherwise, partly cloudy, with a low around 48.
Friday
 
 Patchy fog before 8am. Otherwise, sunny, with a high near 79.
Friday Night
 
 Clear, with a low around 52.
Saturday
 
 Sunny, with a high near 87.
Saturday Night
 
 Clear, with a low around 55.
Sunday
 
 Sunny, with a high near 91.

 

Forecast from NOAA-NWS for Napa CA.