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

62°F

17°C

Humidity 96%
Wind Speed SE 12 mph
Barometer 30.01 in (1015.5 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 19 Sep 7:51 am CDT
Extended Forecast for

Mc Cullom Lake IL

Flood Watch September 19, 08:25am until September 19, 01:00pm
Flood Advisory September 19, 08:25am until September 19, 09:00am
Click here for hazard details and duration
Flood Watch
...
  •  
    Flood Watch September 19, 08:25am until September 19, 01:00pm
    Flood Advisory September 19, 08:25am until September 19, 09:00am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Today

    High: 76 °F

    T-storms then
    T-storms
    Likely

  • Tonight

    Tonight: Showers and thunderstorms, mainly before 4am. Low around 61. East southeast wind 5 to 10 mph becoming north northeast after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    Low: 61 °F

    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms. Cloudy, with a high near 68. Northeast wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.

    High: 68 °F

    Chance
    T-storms then
    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 55. Northeast wind around 15 mph, with gusts as high as 25 mph.

    Low: 55 °F

    Mostly Cloudy

  • Monday

    Monday: A 30 percent chance of showers, mainly before 1pm. Cloudy, with a high near 63. East northeast wind around 15 mph, with gusts as high as 25 mph.

    High: 63 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 50.

    Low: 50 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 62.

    High: 62 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 50.

    Low: 50 °F

    Mostly Cloudy

Detailed Forecast

Today
Showers and thunderstorms, mainly before 1pm, then showers likely and possibly a thunderstorm after 3pm. High near 76. East southeast wind 5 to 10 mph becoming south in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Tonight
Showers and thunderstorms, mainly before 4am. Low around 61. East southeast wind 5 to 10 mph becoming north northeast after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Sunday
A chance of showers and thunderstorms. Cloudy, with a high near 68. Northeast wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.
Sunday Night
Mostly cloudy, with a low around 55. Northeast wind around 15 mph, with gusts as high as 25 mph.
Monday
A 30 percent chance of showers, mainly before 1pm. Cloudy, with a high near 63. East northeast wind around 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly cloudy, with a low around 50.
Tuesday
Mostly cloudy, with a high near 62.
Tuesday Night
Mostly cloudy, with a low around 50.
Wednesday
Partly sunny, with a high near 64.
Wednesday Night
Mostly cloudy, with a low around 51.
Thursday
Partly sunny, with a high near 66.
Thursday Night
Mostly cloudy, with a low around 51.
Friday
Partly sunny, with a high near 70.
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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:
3:46 am CDT Sep 19, 2026
Forecast Valid:
8am CDT Sep 19, 2026-6pm CDT Sep 25, 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