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

Hazardous Weather Conditions

Current conditions at

Chicago / Wheeling, Pal-Waukee Airport (KPWK)

Lat: 42.12°NLon: 87.9°WElev: 646ft.

Mostly Cloudy

76°F

24°C

Humidity 69%
Wind Speed SW 7 mph
Barometer 29.91 in (1012.5 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 18 Aug 6:52 pm CDT
Extended Forecast for

Lake Forest IL

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before midnight. Mostly cloudy, with a low around 64. Southwest wind 5 to 10 mph becoming west northwest after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 64 °F

    T-storms
    Likely then
    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 75. Northwest wind 5 to 10 mph becoming east northeast in the afternoon.

    High: 75 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 61. East wind around 5 mph becoming calm in the evening.

    Low: 61 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 77. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 77 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 62. South southwest wind around 5 mph.

    Low: 62 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 79. Chance of precipitation is 30%.

    High: 79 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

Detailed Forecast

Tonight
Showers and thunderstorms likely, mainly before midnight. Mostly cloudy, with a low around 64. Southwest wind 5 to 10 mph becoming west northwest after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 75. Northwest wind 5 to 10 mph becoming east northeast in the afternoon.
Wednesday Night
Partly cloudy, with a low around 61. East wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 77. Calm wind becoming east southeast around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 62. South southwest wind around 5 mph.
Friday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 79. Chance of precipitation is 30%.
Friday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 64.
Saturday
Mostly sunny, with a high near 77.
Saturday Night
Mostly clear, with a low around 60.
Sunday
Sunny, with a high near 74.
Sunday Night
Partly cloudy, with a low around 60.
Monday
Mostly sunny, with a high near 76.
Monday Night
Partly cloudy, with a low around 62.
Tuesday
Mostly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lake Forest IL
 42.26°N 87.85°W
Last Update:
7:01 pm CDT Aug 18, 2026
Forecast Valid:
7pm CDT Aug 18, 2026-6pm CDT Aug 25, 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