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

83°F

28°C

Humidity 43%
Wind Speed ENE 0 MPH
Barometer 29.82 in (1009.82 mb)
Dewpoint 58°F (14°C)
Visibility NA
Heat Index83°F (28°C)
Last update 09 Sep 03:27 AM PDT
Extended Forecast for

Lake Forest CA

Heat Advisory September 9, 08:00pm until September 10, 08:00pm
Extreme Heat Warning September 9, 04:19am until September 9, 08:00pm
Click here for hazard details and duration
Heat Advisory
Extreme Heat Warning
  •  
    Extreme Heat Warning September 9, 04:19am until September 9, 08:00pm

    NOW until 8:00pm Wed

    Extreme Heat Warning

  • Overnight

    Low: 77 °F

    Slight Chance
    Sprinkles

  • Wednesday

    Wednesday: Sunny, with a high near 105. Heat index values as high as 116. Light and variable wind becoming south 5 to 10 mph in the afternoon.

    High: 105 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 76. Northwest wind around 5 mph becoming calm after midnight.

    Low: 76 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 96. Light southeast wind becoming south 5 to 10 mph in the afternoon.

    High: 96 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 71. Southeast wind around 5 mph.

    Low: 71 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

  • Friday Night

    Friday Night: Patchy fog after 11pm. Otherwise, mostly clear, with a low around 66.

    Low: 66 °F

    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 11am. Otherwise, sunny, with a high near 84.

    High: 84 °F

    Patchy Fog
    then Sunny

Detailed Forecast

Overnight
A slight chance of sprinkles. Mostly clear, with a low around 77. Calm wind.
Wednesday
Sunny, with a high near 105. Heat index values as high as 116. Light and variable wind becoming south 5 to 10 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 76. Northwest wind around 5 mph becoming calm after midnight.
Thursday
Sunny, with a high near 96. Light southeast wind becoming south 5 to 10 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 71. Southeast wind around 5 mph.
Friday
Sunny, with a high near 89.
Friday Night
Patchy fog after 11pm. Otherwise, mostly clear, with a low around 66.
Saturday
Patchy fog before 11am. Otherwise, sunny, with a high near 84.
Saturday Night
Mostly clear, with a low around 63.
Sunday
Sunny, with a high near 83.
Sunday Night
Mostly clear, with a low around 62.
Monday
Sunny, with a high near 83.
Monday Night
Mostly clear, with a low around 61.
Tuesday
Sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lake Forest CA
 33.65°N 117.69°W (Elev. 449 ft)
Last Update:
1:36 am PDT Sep 9, 2026
Forecast Valid:
4am PDT Sep 9, 2026-6pm PDT Sep 15, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation