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.

Fair

29°F

-2°C

Humidity 100%
Wind Speed Calm
Barometer 30.32 in (1027.9 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 20 Apr 5:51 am CDT
Extended Forecast for

Long Lake IL

Freeze Warning April 20, 06:30am until April 20, 09:00am
Click here for hazard details and duration
...
  •  
    Freeze Warning April 20, 06:30am until April 20, 09:00am

    NOW until 9:00am Mon

    Freeze Warning

  • Today

    High: 54 °F

    Frost then
    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 42. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 74. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 74 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 45. West wind around 5 mph becoming north northeast after midnight. Winds could gust as high as 10 mph.

    Low: 45 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 69. North northeast wind 5 to 10 mph becoming east southeast in the afternoon.

    High: 69 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 60.

    Low: 60 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Today
Widespread frost before 9am. Otherwise, sunny, with a high near 54. Light and variable wind becoming south southwest 5 to 10 mph in the morning.
Tonight
Mostly cloudy, with a low around 42. South wind around 10 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 74. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 45. West wind around 5 mph becoming north northeast after midnight. Winds could gust as high as 10 mph.
Wednesday
Sunny, with a high near 69. North northeast wind 5 to 10 mph becoming east southeast in the afternoon.
Wednesday Night
Partly cloudy, with a low around 52.
Thursday
Mostly sunny, with a high near 79.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 60.
Friday
A chance of showers. Mostly cloudy, with a high near 72.
Friday Night
A chance of showers before 1am. Mostly cloudy, with a low around 45.
Saturday
Mostly sunny, with a high near 63.
Saturday Night
Mostly cloudy, with a low around 43.
Sunday
Mostly sunny, with a high near 62.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Long Lake IL
 42.38°N 88.14°W
Last Update:
5:41 am CDT Apr 20, 2026
Forecast Valid:
6am CDT Apr 20, 2026-6pm CDT Apr 26, 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