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

65°F

18°C

Humidity 100%
Wind Speed S 3 mph
Barometer 30.01 in (1015.2 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 3 Aug 11:51 pm CDT
Extended Forecast for

4 Miles NNW Old Mill Creek IL

  • Overnight

    Overnight: Mostly clear, with a low around 64. South wind around 5 mph.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 83. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 83 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms after 1am. Increasing clouds, with a low around 68. South southwest wind around 5 mph, with gusts as high as 10 mph.

    Low: 68 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm before 10am, then showers likely between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Cloudy through mid morning, then becoming mostly sunny, with a high near 74. Southwest wind around 5 mph. Chance of precipitation is 70%.

    High: 74 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 1am, then showers likely. Low around 64. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.

    Low: 64 °F

    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 76. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 64. South wind around 5 mph.
Tuesday
Mostly sunny, with a high near 83. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
A 40 percent chance of showers and thunderstorms after 1am. Increasing clouds, with a low around 68. South southwest wind around 5 mph, with gusts as high as 10 mph.
Wednesday
Showers likely and possibly a thunderstorm before 10am, then showers likely between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Cloudy through mid morning, then becoming mostly sunny, with a high near 74. Southwest wind around 5 mph. Chance of precipitation is 70%.
Wednesday Night
Showers and possibly a thunderstorm before 1am, then showers likely. Low around 64. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 76. Chance of precipitation is 40%.
Thursday Night
Partly cloudy, with a low around 58.
Friday
Sunny, with a high near 81.
Friday Night
Mostly clear, with a low around 61.
Saturday
Mostly sunny, with a high near 83.
Saturday Night
Mostly clear, with a low around 66.
Sunday
Mostly sunny, with a high near 84.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Monday
Partly sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW Old Mill Creek IL
 42.48°N 88.01°W
Last Update:
8:31 pm CDT Aug 3, 2026
Forecast Valid:
12am CDT Aug 4, 2026-6pm CDT Aug 10, 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