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

Dangerous Heat in the Southwest; Severe Thunderstorms from the Central Plains into the Ohio Valley

Dangerous heat will build across the Southwest U.S. through the end of the week with daytime highs of 110-115°F. Isolated to widely scattered severe storms are expected across parts of the central and southern High Plains, Great Lakes into the Ohio Valley, and parts of the Ozarks to Lower Mississippi Valley today. Read More >

Current conditions at

Chicago / Wheeling, Pal-Waukee Airport (KPWK)

Lat: 42.12°NLon: 87.9°WElev: 646ft.

Partly Cloudy

82°F

28°C

Humidity 49%
Wind Speed NW 12 mph
Barometer 29.88 in (1011.4 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 26 Aug 4:52 pm CDT
Extended Forecast for

Lake Forest IL

  • This Afternoon

    This Afternoon: Isolated showers. Mostly sunny, with a high near 84. West northwest wind around 15 mph. Chance of precipitation is 20%.

    High: 84 °F

    Isolated
    Showers

  • Tonight

    Tonight: Isolated showers before 7pm. Mostly clear, with a low around 62. West northwest wind 5 to 10 mph. Chance of precipitation is 10%.

    Low: 62 °F

    Isolated
    Showers then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 77. Northwest wind 5 to 10 mph becoming east northeast in the afternoon.

    High: 77 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61. East northeast wind around 5 mph becoming calm in the evening.

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 78. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 78 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 82.

    High: 82 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A chance of showers after 1am. Mostly cloudy, with a low around 67.

    Low: 67 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A chance of showers before 1pm. Partly sunny, with a high near 86.

    High: 86 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Isolated showers. Mostly sunny, with a high near 84. West northwest wind around 15 mph. Chance of precipitation is 20%.
Tonight
Isolated showers before 7pm. Mostly clear, with a low around 62. West northwest wind 5 to 10 mph. Chance of precipitation is 10%.
Thursday
Sunny, with a high near 77. Northwest wind 5 to 10 mph becoming east northeast in the afternoon.
Thursday Night
Mostly clear, with a low around 61. East northeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 78. Calm wind becoming east southeast around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 63.
Saturday
Partly sunny, with a high near 82.
Saturday Night
A chance of showers after 1am. Mostly cloudy, with a low around 67.
Sunday
A chance of showers before 1pm. Partly sunny, with a high near 86.
Sunday Night
A chance of showers after 1am. Mostly cloudy, with a low around 71.
Monday
Partly sunny, with a high near 88.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Tuesday
Mostly sunny, with a high near 87.
Tuesday Night
Partly cloudy, with a low around 69.
Wednesday
Partly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lake Forest IL
 42.24°N 87.86°W
Last Update:
5:16 pm CDT Aug 26, 2026
Forecast Valid:
5pm CDT Aug 26, 2026-6pm CDT Sep 2, 2026
 
Forecast Discussion
 
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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