NWS Forecast for Lake Forest CA

National Weather Service Forecast for: Lake Forest CA
Issued by: National Weather Service San Diego, CA

Updated: 12:14 pm PDT Apr 6, 2026

Tonight Mostly Clear then Patchy Fog	Tuesday Patchy Fog then Sunny	Tuesday Night Mostly Clear	Wednesday Sunny	Wednesday Night Patchy Fog	Thursday Partly Sunny	Thursday Night Mostly Cloudy	Friday Slight Chance Showers	Friday Night Chance Showers
Lo 55 °F	Hi 78 °F	Lo 56 °F	Hi 79 °F	Lo 57 °F	Hi 78 °F	Lo 56 °F	Hi 76 °F	Lo 55 °F

Tonight	Patchy fog after 2am. Otherwise, partly cloudy, with a low around 55. West wind around 5 mph becoming southeast after midnight.
Tuesday	Patchy fog before 11am. Otherwise, mostly sunny, with a high near 78. Southeast wind around 5 mph becoming southwest in the afternoon.
Tuesday Night	Mostly clear, with a low around 56. Southwest wind around 5 mph becoming calm in the evening.
Wednesday	Sunny, with a high near 79. Southeast wind around 5 mph becoming southwest in the afternoon.
Wednesday Night	Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 57. Southwest wind around 5 mph becoming southeast after midnight.
Thursday	Partly sunny, with a high near 78.
Thursday Night	Mostly cloudy, with a low around 56.
Friday	A slight chance of showers after 11am. Mostly sunny, with a high near 76.
Friday Night	A slight chance of showers and thunderstorms, then a chance of showers after 11pm. Partly cloudy, with a low around 55.
Saturday	Showers likely, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 70.
Saturday Night	A chance of showers. Partly cloudy, with a low around 54.
Sunday	A slight chance of showers. Partly sunny, with a high near 68.
Sunday Night	Mostly cloudy, with a low around 52.
Monday	Partly sunny, with a high near 72.

Forecast from NOAA-NWS for Lake Forest CA.