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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Light Rain

64°F

18°C

Humidity 96%
Wind Speed NE 9 mph
Barometer 29.98 in (1014.5 mb)
Dewpoint 63°F (17°C)
Visibility 8.00 mi
Last update 20 Sep 9:51 am CDT
Extended Forecast for

Waukegan IL

  • Today

    Today: Showers and possibly a thunderstorm before 3pm, then a chance of showers. High near 68. Breezy, with a northeast wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 68 °F

    Showers and
    Breezy

  • Tonight

    Tonight: A 20 percent chance of showers after 3am. Mostly cloudy, with a low around 56. Breezy, with an east northeast wind around 20 mph, with gusts as high as 25 mph.

    Low: 56 °F

    Breezy.
    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Monday

    Monday: A 30 percent chance of showers, mainly between 7am and 8am. Cloudy, with a high near 65. Breezy, with an east northeast wind 20 to 25 mph, with gusts as high as 30 mph.

    High: 65 °F

    Chance
    Showers and
    Breezy

  • Monday Night

    Monday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 54. Breezy, with an east northeast wind 15 to 20 mph.

    Low: 54 °F

    Slight Chance
    Showers and
    Breezy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 63. Breezy, with an east northeast wind 15 to 20 mph, with gusts as high as 25 mph.

    High: 63 °F

    Mostly Cloudy
    and Breezy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 64.

    High: 64 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 64.

    High: 64 °F

    Partly Sunny

Detailed Forecast

Today
Showers and possibly a thunderstorm before 3pm, then a chance of showers. High near 68. Breezy, with a northeast wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
A 20 percent chance of showers after 3am. Mostly cloudy, with a low around 56. Breezy, with an east northeast wind around 20 mph, with gusts as high as 25 mph.
Monday
A 30 percent chance of showers, mainly between 7am and 8am. Cloudy, with a high near 65. Breezy, with an east northeast wind 20 to 25 mph, with gusts as high as 30 mph.
Monday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 54. Breezy, with an east northeast wind 15 to 20 mph.
Tuesday
Mostly cloudy, with a high near 63. Breezy, with an east northeast wind 15 to 20 mph, with gusts as high as 25 mph.
Tuesday Night
Partly cloudy, with a low around 52.
Wednesday
Partly sunny, with a high near 64.
Wednesday Night
Partly cloudy, with a low around 52.
Thursday
Partly sunny, with a high near 64.
Thursday Night
Mostly cloudy, with a low around 53.
Friday
Mostly sunny, with a high near 64.
Friday Night
Partly cloudy, with a low around 53.
Saturday
Mostly sunny, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Waukegan IL
 42.37°N 87.85°W
Last Update:
10:21 am CDT Sep 20, 2026
Forecast Valid:
10am CDT Sep 20, 2026-6pm CDT Sep 26, 2026
 
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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