Dangerous Heat in the Southwest; Severe Thunderstorms and Heavy Rain in the Northeast and Mid-Atlantic

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week. Strong to severe thunderstorms may produce damaging wind, hail, a tornado or two, heavy rain and flash flooding across parts of the Mid-Atlantic and Northeast. Heavy rainfall threat continues across the Gulf Coast. Read More >

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

67°F

19°C

Humidity 84%
Wind Speed NW 5 mph
Barometer 29.99 in (1014.7 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 27 Aug 7:51 am CDT
Extended Forecast for

Mc Cullom Lake IL

  • Today

    Today: A slight chance of showers between 3pm and 4pm.  Mostly sunny, with a high near 80. North northwest wind 5 to 10 mph.  Chance of precipitation is 20%.

    High: 80 °F

    Sunny then
    Slight Chance
    Showers

  • Tonight

    Tonight: Patchy fog after 2am.  Otherwise, mostly clear, with a low around 59. Northeast wind around 5 mph becoming calm  in the evening.

    Low: 59 °F

    Mostly Clear
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 8am.  Otherwise, mostly sunny, with a high near 81. Calm wind becoming west around 5 mph in the afternoon.

    High: 81 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 61. South wind around 5 mph.

    Low: 61 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 79. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 79 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 66.

    Low: 66 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms before 1pm.  Partly sunny, with a high near 85.

    High: 85 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers after 1am.  Mostly cloudy, with a low around 71.

    Low: 71 °F

    Mostly Cloudy
    then Chance
    Showers

  • Monday

    Monday: A chance of showers and thunderstorms before 1pm.  Partly sunny, with a high near 86.

    High: 86 °F

    Chance
    T-storms

Detailed Forecast

Today
A slight chance of showers between 3pm and 4pm. Mostly sunny, with a high near 80. North northwest wind 5 to 10 mph. Chance of precipitation is 20%.
Tonight
Patchy fog after 2am. Otherwise, mostly clear, with a low around 59. Northeast wind around 5 mph becoming calm in the evening.
Friday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 81. Calm wind becoming west around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 61. South wind around 5 mph.
Saturday
Partly sunny, with a high near 79. South wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Sunday
A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 85.
Sunday Night
A chance of showers after 1am. Mostly cloudy, with a low around 71.
Monday
A chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 86.
Monday Night
A chance of showers after 1am. Mostly cloudy, with a low around 71.
Tuesday
A chance of showers. Partly sunny, with a high near 87.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 69.
Wednesday
Mostly sunny, with a high near 86.
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ABOUT THIS FORECAST

 
Point Forecast:
Mc Cullom Lake IL
 42.36°N 88.29°W
3:11 am CDT Aug 27, 2026
8am CDT Aug 27, 2026-6pm CDT Sep 2, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database