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City of Lake Forest, CaliforniaLake Forest, CA Weather Forecast
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Lake Forest Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
 |  | | |  | | |  | | | | |
| Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Clear | Partly Cloudy | Mostly Clear | Mostly Sunny | Clear | Mostly Sunny | Clear | Mostly Sunny |
| Lo: 63°FLo: 17°C | Hi: 86°FHi: 30°C | Lo: 64°FLo: 18°C | Hi: 91°FHi: 33°C | Lo: 66°FLo: 19°C | Hi: 95°FHi: 35°C | Lo: 72°FLo: 22°C | Hi: 94°FHi: 34°C | Lo: 74°FLo: 23°C | Hi: 99°FHi: 37°C | Lo: 74°FLo: 23°C | Hi: 97°FHi: 36°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1227 PM PDT Tue Sep 29 2026 
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Issued: 1049 PM PDT Tue Sep 29 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
Tonight through Wednesday...
An upper level low is continuing to exit the southwestern region, with northerly flow filtering in behind it. These winds will translate to weak off shore winds mixing in overnight, which will help to impede the development of the marine layer overnight. There may still be areas of low clouds, wi...