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

Dangerous Heat in the Central and Eastern U.S.; Severe Thunderstorms in the Great Lakes

Thunderstorms with strong wind gusts and hail will be possible today from Michigan into the Lower Great Lakes region. A significant and dangerous heat wave will expand from the Central U.S. into the Eastern U.S this weekend through much of next week. Numerous daily record highs and warm lows are likely. Read More >

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair and Breezy

89°F

32°C

Humidity 57%
Wind Speed SW 23 G 32 mph
Barometer 29.81 in (1008.0 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index96°F (36°C)
Last update 21 Jun 10:51 am CDT
Extended Forecast for

2 Miles SSW Round Lake Park IL

Heat Advisory June 21, 11:43am until June 24, 12:00am
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 21, 11:43am until June 24, 12:00am

    NOW until 12:00am Tue

    Heat Advisory

  • Today

    High: 94 °F

    Sunny and
    Breezy

  • Tonight

    Tonight: Clear, with a low around 78. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 40 mph.

    Low: 78 °F

    Clear and
    Breezy

  • Sunday

    Sunday: Sunny and hot, with a high near 95. Heat index values as high as 105. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 95 °F

    Sunny then
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 78. South southwest wind around 15 mph, with gusts as high as 30 mph.

    Low: 78 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 97. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 97 °F

    Sunny then
    Sunny and
    Breezy

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.

    Low: 74 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.

    High: 88 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 67.

    Low: 67 °F

    Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 94. Heat index values as high as 106. Breezy, with a south southwest wind around 25 mph, with gusts as high as 40 mph.
Tonight
Clear, with a low around 78. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 40 mph.
Sunday
Sunny and hot, with a high near 95. Heat index values as high as 105. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Sunday Night
Mostly clear, with a low around 78. South southwest wind around 15 mph, with gusts as high as 30 mph.
Monday
Sunny and hot, with a high near 97. 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. Partly cloudy, with a low around 74.
Tuesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Wednesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 86.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Thursday
Showers and thunderstorms likely. Mostly sunny, with a high near 88.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSW Round Lake Park IL
 42.29°N 88.06°W
Last Update:
10:41 am CDT Jun 21, 2025
Forecast Valid:
11am CDT Jun 21, 2025-6pm CDT Jun 27, 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