NWS Forecast for Lake Forest CA

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

Updated: 12:29 am PDT Jun 22, 2026

Today Decreasing Clouds	Tonight Patchy Fog	Tuesday Patchy Fog then Sunny	Tuesday Night Patchy Fog	Wednesday Patchy Fog then Mostly Sunny	Wednesday Night Patchy Fog	Thursday Patchy Fog then Sunny	Thursday Night Partly Cloudy	Friday Becoming Sunny
Hi 78 °F	Lo 61 °F	Hi 83 °F	Lo 64 °F	Hi 85 °F	Lo 63 °F	Hi 83 °F	Lo 61 °F	Hi 83 °F

Air Quality Alert

Today	Mostly cloudy, then gradually becoming sunny, with a high near 78. Light northwest wind becoming west 5 to 10 mph in the afternoon.
Tonight	Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 61. West wind around 5 mph becoming calm in the evening.
Tuesday	Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 83. Calm wind becoming west around 5 mph in the afternoon.
Tuesday Night	Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 64. West wind around 5 mph becoming calm in the evening.
Wednesday	Patchy fog before 11am. Otherwise, mostly sunny, with a high near 85. Calm wind becoming west around 5 mph in the afternoon.
Wednesday Night	Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 63.
Thursday	Patchy fog before 11am. Otherwise, mostly sunny, with a high near 83.
Thursday Night	Partly cloudy, with a low around 61.
Friday	Partly sunny, then gradually becoming sunny, with a high near 83.
Friday Night	Increasing clouds, with a low around 60.
Saturday	Mostly sunny, with a high near 82.
Saturday Night	Increasing clouds, with a low around 60.
Sunday	Mostly cloudy, then gradually becoming sunny, with a high near 75.

Forecast from NOAA-NWS for Lake Forest CA.