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.

Overcast

81°F

27°C

Humidity 77%
Wind Speed NW 6 G 21 mph
Barometer 29.96 in (1013.0 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 3 Sep 9:51 am CDT
Extended Forecast for

Round Lake Beach IL

  • Today

    Today: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. Heat index values as high as 99. West wind 5 to 15 mph becoming east in the afternoon.

    High: 86 °F

    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 70. Southeast wind 5 to 10 mph becoming northeast after midnight. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 70 °F

    T-storms
    Likely

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms, mainly before 10am. Mostly cloudy, then gradual clearing during the afternoon, with a high near 86. Heat index values as high as 95. East southeast wind around 10 mph becoming southwest in the afternoon.

    High: 86 °F

    Chance
    T-storms then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70. East wind around 5 mph, with gusts as high as 10 mph.

    Low: 70 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 78. Northeast wind 5 to 10 mph.

    High: 78 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

  • Labor Day

    Labor Day: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

Detailed Forecast

Today
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. Heat index values as high as 99. West wind 5 to 15 mph becoming east in the afternoon.
Tonight
Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 70. Southeast wind 5 to 10 mph becoming northeast after midnight. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Friday
A 50 percent chance of showers and thunderstorms, mainly before 10am. Mostly cloudy, then gradual clearing during the afternoon, with a high near 86. Heat index values as high as 95. East southeast wind around 10 mph becoming southwest in the afternoon.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70. East wind around 5 mph, with gusts as high as 10 mph.
Saturday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 78. Northeast wind 5 to 10 mph.
Saturday Night
Partly cloudy, with a low around 66.
Sunday
Mostly sunny, with a high near 76.
Sunday Night
Partly cloudy, with a low around 63.
Labor Day
Mostly sunny, with a high near 81.
Monday Night
Partly cloudy, with a low around 64.
Tuesday
Mostly sunny, with a high near 84.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 69.
Wednesday
A chance of showers. Partly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Round Lake Beach IL
 42.37°N 88.08°W
Last Update:
10:21 am CDT Sep 3, 2026
Forecast Valid:
10am CDT Sep 3, 2026-6pm CDT Sep 9, 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