Severe Thunderstorms in the Central Plains; Heavy Rainfall in the Mississippi and Tennessee Valleys; Critical Fire Weather in the Southwest

Scattered severe storms capable of large to very large hail, severe wind gusts, and a few tornadoes will be possible across the central Plains. Heavy rain will pose a flash flood threat across portions of the Mississippi Valley into the Tennessee and Ohio Valleys. Hot, dry and windy conditions will continue to bring a critical fire weather threat from the Southwest into the Great Basin. Read More >

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

71°F

22°C

Humidity 79%
Wind Speed SE 13 mph
Barometer 29.98 in (1014.5 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 8 Jun 12:51 pm CDT
Extended Forecast for

Mc Cullom Lake IL

  • This Afternoon

    This Afternoon: Showers and thunderstorms likely, mainly after 5pm.  Mostly cloudy, with a high near 79. Southeast wind around 15 mph, with gusts as high as 20 mph.  Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 79 °F

    T-storms
    Likely

  • Tonight

    Tonight: Showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers and thunderstorms after 2am.  Low around 69. South southeast wind 5 to 10 mph.  Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 69 °F

    T-storms then
    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers and thunderstorms before 9am, then a slight chance of showers between 9am and 11am.  Partly sunny, with a high near 85. West wind 5 to 10 mph.  Chance of precipitation is 30%.

    High: 85 °F

    Chance
    Showers then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms after 1am.  Mostly cloudy, with a low around 67. West wind around 5 mph becoming south southeast after midnight.

    Low: 67 °F

    Partly Cloudy
    then Chance
    T-storms

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm.  Partly sunny, with a high near 90. Breezy, with a south southwest wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 90 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms and
    Breezy

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm.  Mostly cloudy, with a low around 70. Chance of precipitation is 70%.

    Low: 70 °F

    Showers
    Likely

  • Thursday

    Thursday: A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers and possibly a thunderstorm after 1pm.  High near 86. Chance of precipitation is 80%.

    High: 86 °F

    Chance
    Showers then
    T-storms

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 1am.  Mostly cloudy, with a low around 59.

    Low: 59 °F

    Showers
    Likely

  • Friday

    Friday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

Detailed Forecast

This Afternoon
Showers and thunderstorms likely, mainly after 5pm. Mostly cloudy, with a high near 79. Southeast wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers and thunderstorms after 2am. Low around 69. South southeast wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
A chance of showers and thunderstorms before 9am, then a slight chance of showers between 9am and 11am. Partly sunny, with a high near 85. West wind 5 to 10 mph. Chance of precipitation is 30%.
Tuesday Night
A 50 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 67. West wind around 5 mph becoming south southeast after midnight.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 90. Breezy, with a south southwest wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Chance of precipitation is 70%.
Thursday
A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 86. Chance of precipitation is 80%.
Thursday Night
Showers likely and possibly a thunderstorm before 1am. Mostly cloudy, with a low around 59.
Friday
Sunny, with a high near 82.
Friday Night
Mostly clear, with a low around 61.
Saturday
Sunny, with a high near 84.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 59.
Sunday
Mostly sunny, with a high near 77.
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ABOUT THIS FORECAST

 
Point Forecast:
Mc Cullom Lake IL
 42.36°N 88.29°W
1:21 pm CDT Jun 8, 2026
1pm CDT Jun 8, 2026-6pm CDT Jun 14, 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