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.

Overcast

57°F

14°C

Humidity 93%
Wind Speed W 12 G 23 mph
Barometer 29.77 in (1008.0 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 15 Oct 11:51 pm CDT
Extended Forecast for

Round Lake Heights IL

  • Overnight

    Overnight: Cloudy, with a low around 49. West wind around 15 mph, with gusts as high as 30 mph.

    Low: 49 °F

    Cloudy

  • Friday

    Friday: Showers likely, mainly between noon and 4pm. Mostly cloudy, with a high near 52. Breezy, with a west wind 15 to 20 mph becoming north in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 52 °F

    Breezy.
    Mostly Cloudy
    then Showers
    Likely

  • Friday Night

    Friday Night: A 30 percent chance of showers before 7pm. Areas of frost after 4am. Otherwise, mostly cloudy, then gradually becoming clear, with a low around 32. North wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 32 °F

    Chance
    Showers then
    Areas Frost

  • Saturday

    Saturday: Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 56. North northwest wind 5 to 10 mph becoming southwest in the afternoon.

    High: 56 °F

    Frost then
    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 36. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 36 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 67.

    High: 67 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

Detailed Forecast

Overnight
Cloudy, with a low around 49. West wind around 15 mph, with gusts as high as 30 mph.
Friday
Showers likely, mainly between noon and 4pm. Mostly cloudy, with a high near 52. Breezy, with a west wind 15 to 20 mph becoming north in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A 30 percent chance of showers before 7pm. Areas of frost after 4am. Otherwise, mostly cloudy, then gradually becoming clear, with a low around 32. North wind 10 to 15 mph, with gusts as high as 30 mph.
Saturday
Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 56. North northwest wind 5 to 10 mph becoming southwest in the afternoon.
Saturday Night
Clear, with a low around 36. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday
Sunny, with a high near 63.
Sunday Night
Mostly clear, with a low around 41.
Monday
Mostly sunny, with a high near 67.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Mostly sunny, with a high near 69.
Tuesday Night
Mostly clear, with a low around 44.
Wednesday
Mostly sunny, with a high near 70.
Wednesday Night
Partly cloudy, with a low around 49.
Thursday
Mostly sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Round Lake Heights IL
 42.38°N 88.11°W
Last Update:
11:36 pm CDT Oct 15, 2026
Forecast Valid:
12am CDT Oct 16, 2026-6pm CDT Oct 22, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation