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

Risks of Severe Thunderstorms and Excessive Rainfall; Fire Weather Concerns and Record Warmth

Severe thunderstorms and flash flooding risks increase across the center of the nation today. Meanwhile, ongoing thunderstorms and flash flooding will linger along the Gulf Coast states through the evening. The Great Basin and Intermountain West, warm temperatures and dry fuels with dry lightning may enhance fire weather potential. In addition, across interior Alaska, Red Flag Warning are posted. Read More >

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Mostly Cloudy

70°F

21°C

Humidity 59%
Wind Speed W 8 mph
Barometer 29.95 in (1013.3 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 20 Jun 11:51 am CDT
Extended Forecast for

Waukegan IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 75. North wind around 10 mph, with gusts as high as 20 mph.

    High: 75 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 55. East southeast wind around 5 mph becoming northwest after midnight. Winds could gust as high as 10 mph.

    Low: 55 °F

    Partly Cloudy

  • Sunday

    Sunday: Showers, mainly after 3pm. High near 66. Northeast wind 5 to 10 mph becoming east southeast in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 66 °F

    Partly Sunny
    then Showers

  • Sunday Night

    Sunday Night: Showers, mainly before 1am. Low around 56. East northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.

    Low: 56 °F

    Showers

  • Monday

    Monday: Mostly sunny, with a high near 67. North northeast wind around 15 mph, with gusts as high as 25 mph.

    High: 67 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 53.

    Low: 53 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers after 1am. Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 76.

    High: 76 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 75. North wind around 10 mph, with gusts as high as 20 mph.
Tonight
Partly cloudy, with a low around 55. East southeast wind around 5 mph becoming northwest after midnight. Winds could gust as high as 10 mph.
Sunday
Showers, mainly after 3pm. High near 66. Northeast wind 5 to 10 mph becoming east southeast in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Showers, mainly before 1am. Low around 56. East northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Monday
Mostly sunny, with a high near 67. North northeast wind around 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 53.
Tuesday
Mostly sunny, with a high near 68.
Tuesday Night
A chance of showers after 1am. Partly cloudy, with a low around 57.
Wednesday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 76.
Wednesday Night
A chance of showers before 1am. Partly cloudy, with a low around 57.
Thursday
A chance of showers. Mostly sunny, with a high near 74.
Thursday Night
Partly cloudy, with a low around 57.
Friday
Mostly sunny, with a high near 76.
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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:
12:31 pm CDT Jun 20, 2026
Forecast Valid:
12pm CDT Jun 20, 2026-6pm CDT Jun 26, 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