National Weather Service Forecast for: Lake Forest CA
Issued by: National Weather Service San Diego, CA
Updated: 12:29 am PDT Jun 22, 2026
 
Overnight

Overnight: Patchy fog. Otherwise, mostly cloudy, with a low around 59. Calm wind.
Patchy Fog

 Monday

Monday: Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 78. Light northwest wind becoming west 5 to 10 mph in the afternoon.
Patchy Fog
then Sunny
 Monday
Night
Monday Night: Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 60. West wind around 5 mph becoming calm in the evening.
Patchy Fog

 Tuesday

Tuesday: Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 82. Calm wind becoming west around 5 mph in the morning.
Patchy Fog
then Sunny
 Tuesday
Night
Tuesday Night: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 64. West wind around 5 mph becoming calm in the evening.
Patchy Fog

 Wednesday

Wednesday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 84.
Patchy Fog
then Mostly
Sunny
 Wednesday
Night
Wednesday Night: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 62.
Patchy Fog

 Thursday

Thursday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 82.
Patchy Fog
then Sunny
 Thursday
Night
Thursday Night: Partly cloudy, with a low around 61.
Partly Cloudy
Lo 59 °F Hi 78 °F Lo 60 °F Hi 82 °F Lo 64 °F Hi 84 °F Lo 62 °F Hi 82 °F Lo 61 °F

Air Quality Alert
 

Overnight
 
 Patchy fog. Otherwise, mostly cloudy, with a low around 59. Calm wind.
Monday
 
 Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 78. Light northwest wind becoming west 5 to 10 mph in the afternoon.
Monday Night
 
 Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 60. 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 82. Calm wind becoming west around 5 mph in the morning.
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 84.
Wednesday Night
 
 Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 62.
Thursday
 
 Patchy fog before 11am. Otherwise, mostly sunny, with a high near 82.
Thursday Night
 
 Partly cloudy, with a low around 61.
Friday
 
 Partly sunny, then gradually becoming sunny, with a high near 82.
Friday Night
 
 Increasing clouds, with a low around 60.
Saturday
 
 Mostly sunny, with a high near 81.
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.