National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

CW5283 Foothill Ranch (C5283)

Lat: 33.685°NLon: 117.65583°WElev: 986.91ft.

NA

75°F

24°C

Humidity 72%
Wind Speed ENE 0 MPH
Barometer 29.72 in (1006.44 mb)
Dewpoint 65°F (18°C)
Visibility NA
Last update 28 Aug 03:27 AM PDT
Extended Forecast for

Lake Forest CA

Extreme Heat Warning August 28, 07:41am until August 28, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 28, 07:41am until August 28, 08:00pm

    NOW until 8:00pm Fri

    Extreme Heat Warning

  • Today

    High: 100 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 71. Southwest wind around 5 mph becoming calm.

    Low: 71 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 96. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 96 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 68. Calm wind becoming southeast around 5 mph.

    Low: 68 °F

    Mostly Clear

  • Sunday

    Sunday: Patchy fog before 11am. Otherwise, sunny, with a high near 91. Southwest wind 5 to 10 mph.

    High: 91 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

Detailed Forecast

Today
Mostly sunny, with a high near 100. Heat index values as high as 105. Calm wind becoming west around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 71. Southwest wind around 5 mph becoming calm.
Saturday
Sunny, with a high near 96. Calm wind becoming southwest around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 68. Calm wind becoming southeast around 5 mph.
Sunday
Patchy fog before 11am. Otherwise, sunny, with a high near 91. Southwest wind 5 to 10 mph.
Sunday Night
Mostly clear, with a low around 66.
Monday
Sunny, with a high near 87.
Monday Night
Mostly clear, with a low around 64.
Tuesday
Sunny, with a high near 85.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 66.
Wednesday
A slight chance of showers. Partly sunny, with a high near 88.
Wednesday Night
Mostly cloudy, with a low around 68.
Thursday
A slight chance of showers. Mostly sunny, with a high near 90.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lake Forest CA
 33.65°N 117.69°W (Elev. 449 ft)
Last Update:
1:07 am PDT Aug 28, 2026
Forecast Valid:
7am PDT Aug 28, 2026-6pm PDT Sep 3, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation