National Weather Service Forecast for: Saint Helena CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA
Updated: 11:26 am PDT May 4, 2026
 
Today

Today: A 50 percent chance of rain, mainly after 4pm. Mostly cloudy, with a high near 64. Calm wind becoming west southwest around 6 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible.
Chance Rain

 Tonight

Tonight: Rain, mainly before 1am. Patchy fog after 1am. Low around 50. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Rain and
Patchy Fog
 Tuesday

Tuesday: Areas of fog before 11am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 69. Calm wind becoming west southwest around 5 mph in the afternoon.
Areas Fog
then Partly
Sunny
 Tuesday
Night
Tuesday Night: Patchy fog after midnight. Otherwise, partly cloudy, with a low around 50. West southwest wind around 5 mph becoming calm in the evening.
Partly Cloudy
then Patchy
Fog
 Wednesday

Wednesday: Areas of fog before 9am. Otherwise, mostly sunny, with a high near 77. Light and variable wind.
Areas Fog
then Sunny
 Wednesday
Night
Wednesday Night: Patchy fog after midnight. Otherwise, mostly clear, with a low around 50.
Mostly Clear
then Patchy
Fog
 Thursday

Thursday: Areas of fog before 9am. Otherwise, mostly sunny, with a high near 79.
Areas Fog
then Sunny
 Thursday
Night
Thursday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 48.
Clear then
Patchy Fog
 Friday

Friday: Patchy fog before 7am. Otherwise, mostly sunny, with a high near 82.
Patchy Fog
then Sunny
Hi 64 °F Lo 50 °F Hi 69 °F Lo 50 °F Hi 77 °F Lo 50 °F Hi 79 °F Lo 48 °F Hi 82 °F

 

Today
 
 A 50 percent chance of rain, mainly after 4pm. Mostly cloudy, with a high near 64. Calm wind becoming west southwest around 6 mph in the afternoon. New precipitation amounts of less than a tenth of an inch possible.
Tonight
 
 Rain, mainly before 1am. Patchy fog after 1am. Low around 50. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
 
 Areas of fog before 11am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 69. Calm wind becoming west southwest around 5 mph in the afternoon.
Tuesday Night
 
 Patchy fog after midnight. Otherwise, partly cloudy, with a low around 50. West southwest wind around 5 mph becoming calm in the evening.
Wednesday
 
 Areas of fog before 9am. Otherwise, mostly sunny, with a high near 77. Light and variable wind.
Wednesday Night
 
 Patchy fog after midnight. Otherwise, mostly clear, with a low around 50.
Thursday
 
 Areas of fog before 9am. Otherwise, mostly sunny, with a high near 79.
Thursday Night
 
 Patchy fog after 3am. Otherwise, mostly clear, with a low around 48.
Friday
 
 Patchy fog before 7am. Otherwise, mostly sunny, with a high near 82.
Friday Night
 
 Clear, with a low around 53.
Saturday
 
 Sunny, with a high near 90.
Saturday Night
 
 Clear, with a low around 57.
Sunday
 
 Sunny, with a high near 93.

 

Forecast from NOAA-NWS for Saint Helena CA.