National Weather Service Forecast for: Saint Helena CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 8:57 am PDT Oct 6, 2026
 
Today

Today: Sunny and hot, with a high near 100. Calm wind becoming west around 5 mph in the afternoon.
Hot

 Tonight

Tonight: Mostly clear, with a low around 59. Calm wind.
Mostly Clear

 Wednesday

Wednesday: Sunny and hot, with a high near 98. Calm wind.
Hot

 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 57. Calm wind.
Mostly Clear

 Thursday

Thursday: Sunny and hot, with a high near 99. Calm wind.
Hot

 Thursday
Night
Thursday Night: Mostly clear, with a low around 57.
Mostly Clear

 Friday

Friday: Sunny, with a high near 92.
Sunny

 Friday
Night
Friday Night: Patchy fog after 5am. Otherwise, mostly clear, with a low around 52.
Mostly Clear
then Patchy
Fog
 Saturday

Saturday: Patchy fog before 9am. Otherwise, sunny, with a high near 80.
Patchy Fog
then Sunny
Hi 100 °F Lo 59 °F Hi 98 °F Lo 57 °F Hi 99 °F Lo 57 °F Hi 92 °F Lo 52 °F Hi 80 °F

Heat Advisory
Coastal Flood Advisory
 

Today
 
 Sunny and hot, with a high near 100. Calm wind becoming west around 5 mph in the afternoon.
Tonight
 
 Mostly clear, with a low around 59. Calm wind.
Wednesday
 
 Sunny and hot, with a high near 98. Calm wind.
Wednesday Night
 
 Mostly clear, with a low around 57. Calm wind.
Thursday
 
 Sunny and hot, with a high near 99. Calm wind.
Thursday Night
 
 Mostly clear, with a low around 57.
Friday
 
 Sunny, with a high near 92.
Friday Night
 
 Patchy fog after 5am. Otherwise, mostly clear, with a low around 52.
Saturday
 
 Patchy fog before 9am. Otherwise, sunny, with a high near 80.
Saturday Night
 
 Mostly clear, with a low around 49.
Sunday
 
 Sunny, with a high near 76.
Sunday Night
 
 Mostly clear, with a low around 49.
Columbus Day
 
 Sunny, with a high near 78.

 

Forecast from NOAA-NWS for Saint Helena CA.