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Saint Helena, California 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Saint Helena CA
National Weather Service Forecast for: Saint Helena CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 12:27 pm PST Dec 18, 2025
 
This
Afternoon
This Afternoon: Areas of fog after 5pm. Otherwise, mostly cloudy, with a high near 58. Calm wind.
Areas Fog


 Tonight

Tonight: Rain likely, mainly after 4am. Widespread fog, mainly after 7pm. Otherwise, cloudy, with a steady temperature around 51. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Rain Likely
and Fog

 Friday

Friday: Rain. Areas of dense fog before 8am. High near 57. South southeast wind 3 to 5 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain and
Areas Dense
Fog

 Friday
Night
Friday Night: Rain likely, mainly before 10pm. Widespread fog, mainly after 1am. Otherwise, cloudy, with a low around 48. Calm wind. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Rain Likely
and Patchy
Fog then
Chance Rain
and Fog
 Saturday

Saturday: Rain likely, mainly after 10am. Widespread fog, mainly before 1pm. Otherwise, cloudy, with a high near 54. Calm wind. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Rain Likely
and Fog

 Saturday
Night
Saturday Night: Rain. Areas of fog. Low around 50. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Rain and
Areas Fog

 Sunday

Sunday: Rain before 10am, then showers and possibly a thunderstorm between 10am and 1pm, then rain after 1pm. High near 58. Chance of precipitation is 100%.
Showers


 Sunday
Night
Sunday Night: Rain. Patchy fog after 4am. Otherwise, cloudy, with a low around 51.
Rain and
Patchy Fog

 Monday

Monday: Rain. Patchy fog before 7am. Otherwise, cloudy, with a high near 55.
Rain and
Patchy Fog
Hi 58 °F Lo 51 °F Hi 57 °F Lo 48 °F Hi 54 °F Lo 50 °F Hi 58 °F Lo 51 °F Hi 55 °F

 

This Afternoon
 
 Areas of fog after 5pm. Otherwise, mostly cloudy, with a high near 58. Calm wind.
Tonight
 
 Rain likely, mainly after 4am. Widespread fog, mainly after 7pm. Otherwise, cloudy, with a steady temperature around 51. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
 
 Rain. Areas of dense fog before 8am. High near 57. South southeast wind 3 to 5 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
 
 Rain likely, mainly before 10pm. Widespread fog, mainly after 1am. Otherwise, cloudy, with a low around 48. Calm wind. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
 
 Rain likely, mainly after 10am. Widespread fog, mainly before 1pm. Otherwise, cloudy, with a high near 54. Calm wind. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
 
 Rain. Areas of fog. Low around 50. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Sunday
 
 Rain before 10am, then showers and possibly a thunderstorm between 10am and 1pm, then rain after 1pm. High near 58. Chance of precipitation is 100%.
Sunday Night
 
 Rain. Patchy fog after 4am. Otherwise, cloudy, with a low around 51.
Monday
 
 Rain. Patchy fog before 7am. Otherwise, cloudy, with a high near 55.
Monday Night
 
 Rain. Patchy fog. Otherwise, cloudy, with a low around 46.
Tuesday
 
 Rain. Areas of fog. Otherwise, cloudy, with a high near 53.
Tuesday Night
 
 Rain. Patchy fog. Otherwise, cloudy, with a low around 43.
Wednesday
 
 Rain. Patchy fog. Otherwise, mostly cloudy, with a high near 52.

 

Forecast from NOAA-NWS for Saint Helena CA.

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