Heat Wave Persists Over the Central U.S.; Significant Flooding Expected in the Northern Mid-Atlantic Tuesday

Dangerous and extreme heat will remain across portions of the Central U.S. this week, persisting across the Mid to Lower Mississippi Valleys, Gulf Coast, Southern Plains and portions of Texas. A heat wave over the Southwest will intensify late this week. Severe thunderstorms and flash flooding will spread from the Great Lakes/Ohio Valley to the Mid-Atlantic and Northeast the next few days. Read More >

Hazardous Weather Conditions

Current conditions at

Lewis University Airport (KLOT)

Lat: 41.6°NLon: 88.1°WElev: 669ft.

Thunderstorm in Vicinity

73°F

23°C

Humidity 100%
Wind Speed SW 6 G 12 mph
Barometer 29.70 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Last update 27 Jul 11:15 pm CDT
Extended Forecast for

3 Miles ENE Lemont IL

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly before 1am.  Mostly cloudy, with a low around 70. West northwest wind around 10 mph becoming north after midnight. Winds could gust as high as 20 mph.

    Low: 70 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 82. North northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 82 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 63. North northeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 63 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 84. North northeast wind 5 to 10 mph.

    High: 84 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 65. North northeast wind 5 to 10 mph becoming light and variable  in the evening.

    Low: 65 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Friday

    Friday: A chance of showers and thunderstorms after 1pm.  Mostly cloudy, with a high near 84.

    High: 84 °F

    Partly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers.  Mostly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    Showers

Detailed Forecast

Tonight
A 50 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 70. West northwest wind around 10 mph becoming north after midnight. Winds could gust as high as 20 mph.
Tuesday
Mostly sunny, with a high near 82. North northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 63. North northeast wind 5 to 15 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 84. North northeast wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 65. North northeast wind 5 to 10 mph becoming light and variable in the evening.
Thursday
Sunny, with a high near 87.
Thursday Night
Partly cloudy, with a low around 69.
Friday
A chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 84.
Friday Night
A chance of showers. Mostly cloudy, with a low around 68.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 80.
Saturday Night
Partly cloudy, with a low around 67.
Sunday
Mostly sunny, with a high near 83.
Sunday Night
Mostly clear, with a low around 65.
Monday
Sunny, with a high near 85.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Lemont IL
 41.69°N 87.95°W
9:06 pm CDT Jul 27, 2026
11pm CDT Jul 27, 2026-6pm CDT Aug 3, 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