National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across much of northeast Texas into the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Saturday could bring areas of flooding across parts of the central Plains into the upper Midwest/Great Lakes, and Four Corners states. Read More >

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Light Rain Fog/Mist

66°F

19°C

Humidity 100%
Wind Speed NE 10 mph
Barometer 30.20 in (1021.9 mb)
Dewpoint 66°F (19°C)
Visibility 1.25 mi
Last update 17 Sep 4:51 pm CDT
Extended Forecast for

Chicago / Waukegan, Waukegan Regional Airport IL

  • This Afternoon

    This Afternoon: A 20 percent chance of showers. Patchy fog. Otherwise, cloudy, with a steady temperature around 67. North northeast wind around 10 mph.

    High: 67 °F

    Slight Chance
    Showers and
    Patchy Fog

  • Tonight

    Tonight: A 10 percent chance of showers before 7pm. Patchy fog before 7pm. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 61. North northeast wind around 10 mph.

    Low: 61 °F

    Slight Chance
    Showers and
    Patchy Fog
    then Mostly
    Cloudy

  • Friday

    Friday: A 20 percent chance of showers after 4pm. Partly sunny, with a high near 69. East wind 10 to 15 mph.

    High: 69 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers, then showers and possibly a thunderstorm after 1am. Low around 60. Southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    Low: 60 °F

    Chance
    Showers then
    Showers

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 69. Southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 100%.

    High: 69 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 4am, then showers likely. Low around 60. Chance of precipitation is 80%.

    Low: 60 °F

    Showers

  • Sunday

    Sunday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 67. Chance of precipitation is 60%.

    High: 67 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers. Cloudy, with a low around 54.

    Low: 54 °F

    Chance
    Showers

  • Monday

    Monday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 64.

    High: 64 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
A 20 percent chance of showers. Patchy fog. Otherwise, cloudy, with a steady temperature around 67. North northeast wind around 10 mph.
Tonight
A 10 percent chance of showers before 7pm. Patchy fog before 7pm. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 61. North northeast wind around 10 mph.
Friday
A 20 percent chance of showers after 4pm. Partly sunny, with a high near 69. East wind 10 to 15 mph.
Friday Night
A chance of showers, then showers and possibly a thunderstorm after 1am. Low around 60. Southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Saturday
Showers and possibly a thunderstorm. High near 69. Southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 100%.
Saturday Night
Showers and possibly a thunderstorm before 4am, then showers likely. Low around 60. Chance of precipitation is 80%.
Sunday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 67. Chance of precipitation is 60%.
Sunday Night
A chance of showers. Cloudy, with a low around 54.
Monday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 64.
Monday Night
A chance of showers after 1am. Mostly cloudy, with a low around 53.
Tuesday
Partly sunny, with a high near 63.
Tuesday Night
Mostly cloudy, with a low around 52.
Wednesday
Partly sunny, with a high near 66.
Wednesday Night
Mostly cloudy, with a low around 54.
Thursday
Partly sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Chicago / Waukegan, Waukegan Regional Airport IL
 42.41°N 87.87°W
Last Update:
2:41 pm CDT Sep 17, 2026
Forecast Valid:
5pm CDT Sep 17, 2026-6pm CDT Sep 24, 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