NWS Forecast for Lake Forest CA

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

Updated: 3:03 am PST Dec 17, 2025

Overnight Areas Fog	Wednesday Areas Fog then Sunny	Wednesday Night Mostly Clear	Thursday Sunny	Thursday Night Mostly Clear	Friday Sunny	Friday Night Mostly Clear then Patchy Fog	Saturday Patchy Fog then Mostly Sunny	Saturday Night Patchy Fog
Lo 53 °F	Hi 72 °F	Lo 54 °F	Hi 80 °F	Lo 57 °F	Hi 76 °F	Lo 53 °F	Hi 71 °F	Lo 53 °F

Air Quality Alert
Dense Fog Advisory

Overnight	Areas of fog. Otherwise, mostly cloudy, with a low around 53. Calm wind.
Wednesday	Areas of fog before 10am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 72. Calm wind becoming west around 5 mph in the afternoon.
Wednesday Night	Mostly clear, with a low around 54. Southeast wind around 5 mph.
Thursday	Sunny, with a high near 80. Calm wind becoming northwest around 5 mph in the afternoon.
Thursday Night	Mostly clear, with a low around 57. Calm wind becoming southeast around 5 mph.
Friday	Sunny, with a high near 76.
Friday Night	Patchy fog after 4am. Otherwise, partly cloudy, with a low around 53.
Saturday	Patchy fog before 10am. Otherwise, mostly sunny, with a high near 71.
Saturday Night	Patchy fog after 10pm. Otherwise, partly cloudy, with a low around 53.
Sunday	Patchy fog before 10am. Otherwise, partly sunny, with a high near 72.
Sunday Night	Patchy fog. Otherwise, mostly cloudy, with a low around 53.
Monday	Patchy fog. Otherwise, partly sunny, with a high near 72.
Monday Night	Mostly cloudy, with a low around 53.
Tuesday	A slight chance of showers. Partly sunny, with a high near 69.

Forecast from NOAA-NWS for Lake Forest CA.