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

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

55°F

13°C

Humidity 36%
Wind Speed NW 5 mph
Barometer 29.89 in (1012.6 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill54°F (12°C)
Last update 15 Feb 4:51 pm CST
Extended Forecast for

Long Lake IL

  • Tonight

    Tonight: Increasing clouds, with a low around 35. Calm wind becoming south southwest around 5 mph after midnight. Winds could gust as high as 10 mph.

    Low: 35 °F

    Increasing
    Clouds

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 62. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 62 °F

    Partly Sunny

  • Monday Night

    Monday Night: Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 37. West southwest wind around 5 mph becoming east after midnight.

    Low: 37 °F

    Partly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 51. East southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 51 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Tuesday Night

    Tuesday Night: Showers likely, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 47. East southeast wind around 15 mph becoming south southwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%.

    Low: 47 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A 30 percent chance of showers before noon. Mostly sunny, with a high near 63. Breezy.

    High: 63 °F

    Chance
    Showers then
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 35.

    Low: 35 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of rain after noon. Partly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny
    then Chance
    Rain

  • Thursday Night

    Thursday Night: A chance of rain. Mostly cloudy, with a low around 32.

    Low: 32 °F

    Chance Rain

Detailed Forecast

Tonight
Increasing clouds, with a low around 35. Calm wind becoming south southwest around 5 mph after midnight. Winds could gust as high as 10 mph.
Washington's Birthday
Partly sunny, with a high near 62. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Monday Night
Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 37. West southwest wind around 5 mph becoming east after midnight.
Tuesday
Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 51. East southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Tuesday Night
Showers likely, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 47. East southeast wind around 15 mph becoming south southwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%.
Wednesday
A 30 percent chance of showers before noon. Mostly sunny, with a high near 63. Breezy.
Wednesday Night
Partly cloudy, with a low around 35.
Thursday
A chance of rain after noon. Partly sunny, with a high near 53.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 32.
Friday
Mostly sunny, with a high near 42.
Friday Night
Partly cloudy, with a low around 25.
Saturday
Mostly sunny, with a high near 38.
Saturday Night
Mostly cloudy, with a low around 21.
Sunday
Mostly sunny, with a high near 35.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Long Lake IL
 42.38°N 88.14°W
Last Update:
3:11 pm CST Feb 15, 2026
Forecast Valid:
5pm CST Feb 15, 2026-6pm CST Feb 22, 2026
 
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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