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

Heavy to Excessive Rainfall This Week from the Southwest into Central U.S.

Pacific tropical moisture wrapping into a storm over the southwest U.S. will continue a multi-day heavy rainfall event this week that will extend into the Midwest and southern Plains. Considerable flash flooding is possible across portions of New Mexico and west Texas today through Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

70°F

21°C

Humidity 71%
Wind Speed SE 9 mph
Barometer 29.96 in (1014.2 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 29 Sep 2:51 pm CDT
Extended Forecast for

Mc Cullom Lake IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 76. South southwest wind around 10 mph.

    High: 76 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 40 percent chance of showers after 1am. Cloudy, with a low around 60. South wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 60 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers. High near 68. South southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 68 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers, with thunderstorms also possible after 4am. Low around 64. South southwest wind 5 to 10 mph becoming light southwest after midnight. Chance of precipitation is 90%.

    Low: 64 °F

    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm before 1pm, then showers between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 70. Calm wind becoming northwest around 5 mph in the afternoon. Winds could gust as high as 10 mph. Chance of precipitation is 90%.

    High: 70 °F

    Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 53. Chance of precipitation is 80%.

    Low: 53 °F

    Showers

  • Friday

    Friday: Partly sunny, with a high near 66.

    High: 66 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 76. South southwest wind around 10 mph.
Tonight
A 40 percent chance of showers after 1am. Cloudy, with a low around 60. South wind 5 to 10 mph, with gusts as high as 15 mph.
Wednesday
Showers. High near 68. South southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday Night
Showers, with thunderstorms also possible after 4am. Low around 64. South southwest wind 5 to 10 mph becoming light southwest after midnight. Chance of precipitation is 90%.
Thursday
Showers and possibly a thunderstorm before 1pm, then showers between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 70. Calm wind becoming northwest around 5 mph in the afternoon. Winds could gust as high as 10 mph. Chance of precipitation is 90%.
Thursday Night
Showers and possibly a thunderstorm. Low around 53. Chance of precipitation is 80%.
Friday
Partly sunny, with a high near 66.
Friday Night
Mostly clear, with a low around 45.
Saturday
Sunny, with a high near 65.
Saturday Night
Partly cloudy, with a low around 46.
Sunday
Mostly sunny, with a high near 66.
Sunday Night
Mostly clear, with a low around 42.
Monday
Sunny, with a high near 62.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mc Cullom Lake IL
 42.36°N 88.29°W
Last Update:
3:01 pm CDT Sep 29, 2026
Forecast Valid:
3pm CDT Sep 29, 2026-6pm CDT Oct 5, 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