National Weather Service Forecast for: Saint Helena CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:26 am PDT Jun 22, 2026
 
Overnight

Overnight: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 52. Calm wind.
Patchy Fog

 Monday

Monday: Patchy fog before 7am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 87. Calm wind becoming west southwest around 6 mph in the afternoon.
Patchy Fog
then Sunny
 Monday
Night
Monday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 52. West wind around 5 mph becoming calm in the evening.
Mostly Clear
then Patchy
Fog
 Tuesday

Tuesday: Patchy fog before 7am. Otherwise, sunny, with a high near 88. Calm wind becoming southwest around 5 mph in the afternoon.
Patchy Fog
then Sunny
 Tuesday
Night
Tuesday Night: Patchy fog after 4am. Otherwise, mostly clear, with a low around 53. West southwest wind around 5 mph becoming calm in the evening.
Clear then
Patchy Fog
 Wednesday

Wednesday: Patchy fog before 7am. Otherwise, sunny, with a high near 89.
Patchy Fog
then Sunny
 Wednesday
Night
Wednesday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 53.
Clear then
Patchy Fog
 Thursday

Thursday: Patchy fog before 7am. Otherwise, sunny, with a high near 88.
Patchy Fog
then Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 54.
Mostly Clear
Lo 52 °F Hi 87 °F Lo 52 °F Hi 88 °F Lo 53 °F Hi 89 °F Lo 53 °F Hi 88 °F Lo 54 °F

 

Overnight
 
 Patchy fog after 3am. Otherwise, partly cloudy, with a low around 52. Calm wind.
Monday
 
 Patchy fog before 7am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 87. Calm wind becoming west southwest around 6 mph in the afternoon.
Monday Night
 
 Patchy fog after 3am. Otherwise, mostly clear, with a low around 52. West wind around 5 mph becoming calm in the evening.
Tuesday
 
 Patchy fog before 7am. Otherwise, sunny, with a high near 88. Calm wind becoming southwest around 5 mph in the afternoon.
Tuesday Night
 
 Patchy fog after 4am. Otherwise, mostly clear, with a low around 53. West southwest wind around 5 mph becoming calm in the evening.
Wednesday
 
 Patchy fog before 7am. Otherwise, sunny, with a high near 89.
Wednesday Night
 
 Patchy fog after 3am. Otherwise, mostly clear, with a low around 53.
Thursday
 
 Patchy fog before 7am. Otherwise, sunny, with a high near 88.
Thursday Night
 
 Mostly clear, with a low around 54.
Friday
 
 Mostly sunny, with a high near 84.
Friday Night
 
 Patchy fog. Otherwise, mostly clear, with a low around 54.
Saturday
 
 Patchy fog. Otherwise, sunny, with a high near 84.
Saturday Night
 
 Clear, with a low around 54.
Sunday
 
 Sunny, with a high near 88.

 

Forecast from NOAA-NWS for Saint Helena CA.