National Weather Service Forecast for: Saint Helena CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 1:33 pm PST Feb 1, 2026
 
Tonight

Tonight: Clear, with a low around 43. Calm wind.
Clear
 Monday

Monday: Sunny, with a high near 70. Calm wind.
Sunny
 Monday
Night
Monday Night: Partly cloudy, with a low around 43. Calm wind.
Partly Cloudy
 Tuesday

Tuesday: Sunny, with a high near 70. Calm wind.
Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 43. Calm wind.
Mostly Clear
 Wednesday

Wednesday: Sunny, with a high near 71.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 44.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 69.
Sunny
 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 46.
Mostly Cloudy
Lo 43 °F Hi 70 °F Lo 43 °F Hi 70 °F Lo 43 °F Hi 71 °F Lo 44 °F Hi 69 °F Lo 46 °F

Coastal Flood Advisory
 

Tonight
 
 Clear, with a low around 43. Calm wind.
Monday
 
 Sunny, with a high near 70. Calm wind.
Monday Night
 
 Partly cloudy, with a low around 43. Calm wind.
Tuesday
 
 Sunny, with a high near 70. Calm wind.
Tuesday Night
 
 Mostly clear, with a low around 43. Calm wind.
Wednesday
 
 Sunny, with a high near 71.
Wednesday Night
 
 Mostly clear, with a low around 44.
Thursday
 
 Sunny, with a high near 69.
Thursday Night
 
 Mostly cloudy, with a low around 46.
Friday
 
 Mostly sunny, with a high near 68.
Friday Night
 
 Partly cloudy, with a low around 45.
Saturday
 
 Patchy fog. Otherwise, mostly sunny, with a high near 68.
Saturday Night
 
 Partly cloudy, with a low around 46.
Sunday
 
 A slight chance of rain. Mostly sunny, with a high near 68.

 

Forecast from NOAA-NWS for Saint Helena CA.