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

49°F

9°C

Humidity 61%
Wind Speed NE 12 mph
Barometer 30.23 in (1024.1 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 21 May 7:51 pm CDT
Extended Forecast for

Round Lake IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 47. East northeast wind around 10 mph, with gusts as high as 15 mph.

    Low: 47 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 64. East wind around 15 mph, with gusts as high as 25 mph.

    High: 64 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 20 percent chance of showers after 1am. Cloudy, with a low around 50. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 50 °F

    Cloudy then
    Slight Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 69. Northeast wind 5 to 10 mph.

    High: 69 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 51. Northeast wind around 5 mph becoming calm in the evening.

    Low: 51 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms before 1pm, then a slight chance of showers. Mostly cloudy, with a high near 76. Chance of precipitation is 30%.

    High: 76 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

  • Memorial Day

    Memorial Day: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 47. East northeast wind around 10 mph, with gusts as high as 15 mph.
Friday
Mostly cloudy, with a high near 64. East wind around 15 mph, with gusts as high as 25 mph.
Friday Night
A 20 percent chance of showers after 1am. Cloudy, with a low around 50. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 69. Northeast wind 5 to 10 mph.
Saturday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 51. Northeast wind around 5 mph becoming calm in the evening.
Sunday
A chance of showers and thunderstorms before 1pm, then a slight chance of showers. Mostly cloudy, with a high near 76. Chance of precipitation is 30%.
Sunday Night
Partly cloudy, with a low around 54.
Memorial Day
Mostly sunny, with a high near 82.
Monday Night
Partly cloudy, with a low around 57.
Tuesday
Mostly sunny, with a high near 84.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 58.
Wednesday
A chance of showers. Partly sunny, with a high near 81.
Wednesday Night
Partly cloudy, with a low around 59.
Thursday
Partly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Round Lake IL
 42.35°N 88.11°W
Last Update:
4:06 pm CDT May 21, 2026
Forecast Valid:
8pm CDT May 21, 2026-6pm CDT May 28, 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