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: 1:26 pm PDT Jul 25, 2025

Tonight Mostly Clear then Patchy Fog	Saturday Patchy Fog then Sunny	Saturday Night Mostly Clear then Patchy Fog	Sunday Patchy Fog then Sunny	Sunday Night Mostly Clear then Patchy Fog	Monday Patchy Fog then Sunny	Monday Night Mostly Clear	Tuesday Sunny	Tuesday Night Mostly Clear then Patchy Fog
Lo 53 °F	Hi 78 °F	Lo 52 °F	Hi 84 °F	Lo 53 °F	Hi 89 °F	Lo 54 °F	Hi 89 °F	Lo 52 °F

Tonight	Patchy fog after 1am. Otherwise, increasing clouds, with a low around 53. West southwest wind around 6 mph becoming calm in the evening.
Saturday	Patchy fog before 10am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 78. Calm wind becoming west southwest around 6 mph in the afternoon.
Saturday Night	Patchy fog after midnight. Otherwise, increasing clouds, with a low around 52. Light southwest wind.
Sunday	Patchy fog before 9am. Otherwise, mostly cloudy through mid morning, then gradual clearing, with a high near 84. Light and variable wind.
Sunday Night	Patchy fog after 4am. Otherwise, mostly clear, with a low around 53. Southwest wind around 6 mph becoming calm in the evening.
Monday	Patchy fog before 8am. Otherwise, sunny, with a high near 89.
Monday Night	Mostly clear, with a low around 54.
Tuesday	Sunny, with a high near 89.
Tuesday Night	Patchy fog after 2am. Otherwise, partly cloudy, with a low around 52.
Wednesday	Patchy fog before 9am. Otherwise, sunny, with a high near 85.
Wednesday Night	Patchy fog. Otherwise, mostly clear, with a low around 53.
Thursday	Patchy fog. Otherwise, sunny, with a high near 87.
Thursday Night	Patchy fog. Otherwise, mostly clear, with a low around 55.
Friday	Patchy fog. Otherwise, sunny, with a high near 89.

Forecast from NOAA-NWS for Saint Helena CA.