National Weather Service Forecast for: Saint Helena CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:26 pm PDT Jun 19, 2026
 
Tonight

Tonight: Patchy fog after 3am. Otherwise, increasing clouds, with a low around 50. West wind 5 to 8 mph becoming calm in the evening. Winds could gust as high as 18 mph.
Mostly Clear
then Patchy
Fog
 Saturday

Saturday: Partly sunny, then gradually becoming sunny, with a high near 78. Calm wind becoming west southwest around 6 mph in the afternoon.
Becoming
Sunny
 Saturday
Night
Saturday Night: Areas of fog after 1am. Otherwise, increasing clouds, with a low around 50. West southwest wind around 6 mph becoming calm in the evening.
Mostly Clear
then Areas
Fog
 Sunday

Sunday: Patchy fog before 8am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 86. Calm wind becoming southwest around 5 mph in the afternoon.
Patchy Fog
then Sunny
 Sunday
Night
Sunday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 52. Southwest wind around 6 mph becoming calm in the evening.
Clear then
Patchy Fog
 Monday

Monday: Patchy fog before 7am. Otherwise, sunny, with a high near 87.
Patchy Fog
then Sunny
 Monday
Night
Monday Night: Patchy fog after 2am. Otherwise, mostly clear, with a low around 53.
Clear then
Patchy Fog
 Tuesday

Tuesday: Patchy fog before 7am. Otherwise, sunny, with a high near 89.
Patchy Fog
then Sunny
 Tuesday
Night
Tuesday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 53.
Clear then
Patchy Fog
Lo 50 °F Hi 78 °F Lo 50 °F Hi 86 °F Lo 52 °F Hi 87 °F Lo 53 °F Hi 89 °F Lo 53 °F

 

Tonight
 
 Patchy fog after 3am. Otherwise, increasing clouds, with a low around 50. West wind 5 to 8 mph becoming calm in the evening. Winds could gust as high as 18 mph.
Saturday
 
 Partly sunny, then gradually becoming sunny, with a high near 78. Calm wind becoming west southwest around 6 mph in the afternoon.
Saturday Night
 
 Areas of fog after 1am. Otherwise, increasing clouds, with a low around 50. West southwest wind around 6 mph becoming calm in the evening.
Sunday
 
 Patchy fog before 8am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 86. Calm wind becoming southwest around 5 mph in the afternoon.
Sunday Night
 
 Patchy fog after 3am. Otherwise, mostly clear, with a low around 52. Southwest wind around 6 mph becoming calm in the evening.
Monday
 
 Patchy fog before 7am. Otherwise, sunny, with a high near 87.
Monday Night
 
 Patchy fog after 2am. Otherwise, mostly clear, with a low around 53.
Tuesday
 
 Patchy fog before 7am. Otherwise, sunny, with a high near 89.
Tuesday Night
 
 Patchy fog after 3am. Otherwise, mostly clear, with a low around 53.
Wednesday
 
 Patchy fog before 7am. Otherwise, sunny, with a high near 90.
Wednesday Night
 
 Patchy fog. Otherwise, mostly clear, with a low around 54.
Thursday
 
 Sunny, with a high near 89.
Thursday Night
 
 Patchy fog. Otherwise, mostly clear, with a low around 54.
Friday
 
 Sunny, with a high near 89.

 

Forecast from NOAA-NWS for Saint Helena CA.