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.

Fog/Mist

28°F

-2°C

Humidity 96%
Wind Speed Calm
Barometer 30.42 in (1031.1 mb)
Dewpoint 27°F (-3°C)
Visibility 6.00 mi
Last update 11 Apr 5:51 am CDT
Extended Forecast for

Round Lake Heights IL

  • Today

    Today: Patchy fog before 8am. Otherwise, increasing clouds, with a high near 54. Light east wind becoming east southeast 5 to 10 mph in the morning. Winds could gust as high as 15 mph.

    High: 54 °F

    Patchy Fog
    then Partly
    Sunny

  • Tonight

    Tonight: A 40 percent chance of showers, mainly after 9pm. Mostly cloudy, with a low around 45. East southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 45 °F

    Chance
    Showers

  • Sunday

    Sunday: Scattered showers and thunderstorms, then periods of showers and possibly a thunderstorm after 1pm. High near 74. Breezy, with a south southwest wind 15 to 25 mph, with gusts as high as 35 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 74 °F

    Breezy.
    Scattered
    Showers then
    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 61. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%.

    Low: 61 °F

    Showers and
    Breezy

  • Monday

    Monday: A chance of thunderstorms before 7am, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 77. Southwest wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 77 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 80.

    High: 80 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 62.

    Low: 62 °F

    Showers

  • Wednesday

    Wednesday: A chance of showers. Partly sunny, with a high near 77.

    High: 77 °F

    Chance
    Showers

Detailed Forecast

Today
Patchy fog before 8am. Otherwise, increasing clouds, with a high near 54. Light east wind becoming east southeast 5 to 10 mph in the morning. Winds could gust as high as 15 mph.
Tonight
A 40 percent chance of showers, mainly after 9pm. Mostly cloudy, with a low around 45. East southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday
Scattered showers and thunderstorms, then periods of showers and possibly a thunderstorm after 1pm. High near 74. Breezy, with a south southwest wind 15 to 25 mph, with gusts as high as 35 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers and possibly a thunderstorm. Low around 61. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%.
Monday
A chance of thunderstorms before 7am, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 77. Southwest wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Tuesday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 80.
Tuesday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 62.
Wednesday
A chance of showers. Partly sunny, with a high near 77.
Wednesday Night
Showers likely, mainly before 1am. Mostly cloudy, with a low around 57.
Thursday
A chance of showers. Mostly sunny, with a high near 76.
Thursday Night
A chance of showers. Partly cloudy, with a low around 56.
Friday
A chance of showers. Partly sunny, with a high near 74.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Round Lake Heights IL
 42.38°N 88.11°W
Last Update:
5:26 am CDT Apr 11, 2026
Forecast Valid:
6am CDT Apr 11, 2026-6pm CDT Apr 17, 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