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

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Partly Cloudy

90°F

32°C

Humidity 63%
Wind Speed SW 16 mph
Barometer 29.99 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index101°F (38°C)
Last update 22 Jun 11:51 am CDT
Extended Forecast for

Grayslake IL

Heat Advisory June 22, 12:21pm until June 24, 12:00am
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 22, 12:21pm until June 24, 12:00am

    NOW until 12:00am Tue

    Heat Advisory

  • This Afternoon

    High: 97 °F

    Hot and
    Breezy

  • Tonight

    Tonight: Clear, with a low around 78. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 78 °F

    Clear and
    Breezy then
    Clear

  • Monday

    Monday: Sunny and hot, with a high near 96. Heat index values as high as 102. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 96 °F

    Hot and
    Breezy

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Increasing clouds, with a low around 75. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 75 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. West northwest wind 5 to 10 mph becoming northeast in the afternoon.

    High: 87 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 86. Chance of precipitation is 60%.

    High: 86 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny and hot, with a high near 97. Heat index values as high as 107. Breezy, with a southwest wind around 20 mph, with gusts as high as 35 mph.
Tonight
Clear, with a low around 78. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.
Monday
Sunny and hot, with a high near 96. Heat index values as high as 102. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Monday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Increasing clouds, with a low around 75. Southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. West northwest wind 5 to 10 mph becoming northeast in the afternoon.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Wednesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 86. Chance of precipitation is 60%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 85.
Thursday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 67.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 85.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.37°N 88.05°W
Last Update:
11:56 am CDT Jun 22, 2025
Forecast Valid:
12pm CDT Jun 22, 2025-6pm CDT Jun 28, 2025
 
Forecast Discussion
 
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Additional Resources

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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