National Weather Service Forecast for: Saint Helena CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 11:26 pm PDT Jun 29, 2026
 
Tonight

Tonight: Mostly clear, with a low around 56. Calm wind.
Mostly Clear

 Tuesday

Tuesday: Sunny, with a high near 86. Calm wind becoming south around 6 mph in the afternoon.
Sunny

 Tuesday
Night
Tuesday Night: Patchy fog after 4am. Otherwise, increasing clouds, with a low around 52. Light and variable wind.
Clear then
Patchy Fog
 Wednesday

Wednesday: Partly sunny, then gradually becoming sunny, with a high near 85. Calm wind becoming south southwest around 5 mph in the afternoon.
Becoming
Sunny
 Wednesday
Night
Wednesday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 51. Southwest wind around 6 mph becoming calm in the evening.
Mostly Clear
then Patchy
Fog
 Thursday

Thursday: Areas of fog before 8am. Otherwise, mostly sunny, with a high near 82.
Areas Fog
then Sunny
 Thursday
Night
Thursday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 52.
Mostly Clear
then Patchy
Fog
 Friday

Friday: Areas of fog before 7am. Otherwise, sunny, with a high near 87.
Areas Fog
then Sunny
 Friday
Night
Friday Night: Mostly clear, with a low around 55.
Mostly Clear
Lo 56 °F Hi 86 °F Lo 52 °F Hi 85 °F Lo 51 °F Hi 82 °F Lo 52 °F Hi 87 °F Lo 55 °F

 

Tonight
 
 Mostly clear, with a low around 56. Calm wind.
Tuesday
 
 Sunny, with a high near 86. Calm wind becoming south around 6 mph in the afternoon.
Tuesday Night
 
 Patchy fog after 4am. Otherwise, increasing clouds, with a low around 52. Light and variable wind.
Wednesday
 
 Partly sunny, then gradually becoming sunny, with a high near 85. Calm wind becoming south southwest around 5 mph in the afternoon.
Wednesday Night
 
 Patchy fog after 3am. Otherwise, mostly clear, with a low around 51. Southwest wind around 6 mph becoming calm in the evening.
Thursday
 
 Areas of fog before 8am. Otherwise, mostly sunny, with a high near 82.
Thursday Night
 
 Patchy fog after 3am. Otherwise, mostly clear, with a low around 52.
Friday
 
 Areas of fog before 7am. Otherwise, sunny, with a high near 87.
Friday Night
 
 Mostly clear, with a low around 55.
Independence Day
 
 Sunny, with a high near 89.
Saturday Night
 
 Mostly clear, with a low around 54.
Sunday
 
 Mostly sunny, with a high near 86.
Sunday Night
 
 Partly cloudy, with a low around 53.
Monday
 
 Mostly sunny, with a high near 85.

 

Forecast from NOAA-NWS for Saint Helena CA.