National Weather Service Forecast for: Saint Helena CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:26 pm PDT Jul 25, 2025
 
Tonight

Tonight: Patchy fog after 1am.  Otherwise, increasing clouds, with a low around 53. West southwest wind around 6 mph becoming calm  in the evening.
Mostly Clear
then Patchy
Fog
Saturday

Saturday: Patchy fog before 10am.  Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 78. Calm wind becoming west southwest around 6 mph in the afternoon.
Patchy Fog
then Sunny
Saturday
Night
Saturday Night: Patchy fog after midnight.  Otherwise, increasing clouds, with a low around 52. Light southwest wind.
Mostly Clear
then Patchy
Fog
Sunday

Sunday: Patchy fog before 9am.  Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 84. Light and variable wind.
Patchy Fog
then Sunny
Sunday
Night
Sunday Night: Patchy fog after 4am.  Otherwise, mostly clear, with a low around 53. Southwest wind around 6 mph becoming calm  in the evening.
Mostly Clear
then Patchy
Fog
Monday

Monday: Patchy fog before 8am.  Otherwise, sunny, with a high near 89.
Patchy Fog
then Sunny
Monday
Night
Monday Night: Mostly clear, with a low around 54.
Mostly Clear

Tuesday

Tuesday: Sunny, with a high near 89.
Sunny

Tuesday
Night
Tuesday Night: Patchy fog after 2am.  Otherwise, partly cloudy, with a low around 52.
Mostly Clear
then Patchy
Fog
Lo 53 °F Hi 78 °F Lo 52 °F Hi 84 °F Lo 53 °F Hi 89 °F Lo 54 °F Hi 89 °F Lo 52 °F

 

Tonight
 
Patchy fog after 1am. Otherwise, increasing clouds, with a low around 53. West southwest wind around 6 mph becoming calm in the evening.
Saturday
 
Patchy fog before 10am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 78. Calm wind becoming west southwest around 6 mph in the afternoon.
Saturday Night
 
Patchy fog after midnight. Otherwise, increasing clouds, with a low around 52. Light southwest wind.
Sunday
 
Patchy fog before 9am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 84. Light and variable wind.
Sunday Night
 
Patchy fog after 4am. Otherwise, mostly clear, with a low around 53. Southwest wind around 6 mph becoming calm in the evening.
Monday
 
Patchy fog before 8am. Otherwise, sunny, with a high near 89.
Monday Night
 
Mostly clear, with a low around 54.
Tuesday
 
Sunny, with a high near 89.
Tuesday Night
 
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 52.
Wednesday
 
Patchy fog before 9am. Otherwise, sunny, with a high near 85.
Wednesday Night
 
Patchy fog. Otherwise, mostly clear, with a low around 53.
Thursday
 
Patchy fog. Otherwise, sunny, with a high near 87.
Thursday Night
 
Patchy fog. Otherwise, mostly clear, with a low around 55.
Friday
 
Patchy fog. Otherwise, sunny, with a high near 89.

 

Forecast from NOAA-NWS for Saint Helena CA.