Heat Wave Expands to the East Coast; Flash Flooding Likely in the Central Plains into the Midwest; Severe Thunderstorms in the Northeast

Dangerous, prolonged heat is ongoing in the Mid-South to Mid-Mississippi Valley and heat expands into the Northeast for a brief period today. Widely scattered instances of flash flooding due to heavy rains are forecast from northeast Kansas to much of Indiana. Scattered strong to severe thunderstorms are possible across parts of New England, northern Mid-Atlantic, and North Dakota. Read More >

Current conditions at

Lewis University Airport (KLOT)

Lat: 41.6°NLon: 88.1°WElev: 669ft.

Overcast

75°F

24°C

Humidity 100%
Wind Speed E 7 mph
Barometer 30.04 in
Dewpoint 75°F (24°C)
Visibility 9.00 mi
Last update 25 Jul 9:55 pm CDT
Extended Forecast for

Lemont IL

Flood Watch July 25, 10:04pm until July 26, 07:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch July 25, 10:04pm until July 26, 07:00pm

    NOW until 7:00pm Sat

    Flood Watch

  • Tonight

    Low: 73 °F

    T-storms
    Likely

  • Saturday

    Saturday: Showers and thunderstorms likely before 1pm, then showers likely and possibly a thunderstorm after 1pm.  Mostly cloudy, with a high near 84. South southwest wind around 5 mph.  Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 84 °F

    T-storms
    Likely

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 72. West southwest wind around 5 mph becoming south in the evening. Winds could gust as high as 10 mph.

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms.  Partly sunny, with a high near 90. Heat index values as high as 102. Calm wind becoming west southwest around 5 mph in the morning. Winds could gust as high as 10 mph.

    High: 90 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 75. South southwest wind around 5 mph.

    Low: 75 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 94.

    High: 94 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny

Detailed Forecast

Tonight
Showers and thunderstorms likely, mainly after midnight. Mostly cloudy, with a low around 73. East wind around 5 mph becoming south southwest after midnight. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers and thunderstorms likely before 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 84. South southwest wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. West southwest wind around 5 mph becoming south in the evening. Winds could gust as high as 10 mph.
Sunday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 90. Heat index values as high as 102. Calm wind becoming west southwest around 5 mph in the morning. Winds could gust as high as 10 mph.
Sunday Night
Partly cloudy, with a low around 75. South southwest wind around 5 mph.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94.
Monday Night
Mostly clear, with a low around 74.
Tuesday
Mostly sunny, with a high near 91.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 80.
Wednesday Night
Partly cloudy, with a low around 65.
Thursday
Mostly sunny, with a high near 77.
Thursday Night
Partly cloudy, with a low around 61.
Friday
Sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
Lemont IL
 41.67°N 87.98°W
8:57 pm CDT Jul 25, 2025
10pm CDT Jul 25, 2025-6pm CDT Aug 1, 2025
 
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Additional Resources

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