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

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

A Few Clouds

81°F

27°C

Humidity 85%
Wind Speed SW 6 mph
Barometer 30.05 in (1017.1 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 26 Jul 7:52 am CDT
Extended Forecast for

2 Miles WNW Royalton IL

Extreme Heat Watch July 28, 12:00pm until July 29, 08:00pm
Heat Advisory July 26, 08:26am until July 28, 12:00pm
Click here for hazard details and duration
Extreme Heat Watch
Heat Advisory
  •  
    Heat Advisory July 26, 08:26am until July 28, 12:00pm

    NOW until 12:00pm Mon

    Heat Advisory

  • Today

    High: 91 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 76. South wind 5 to 9 mph.

    Low: 76 °F

    Partly Cloudy

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms, mainly after 1pm.  Mostly sunny, with a high near 93. Heat index values as high as 107. Southwest wind around 8 mph.

    High: 93 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 76. South southwest wind around 6 mph becoming calm  in the evening.

    Low: 76 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 95. Calm wind becoming west around 6 mph in the morning.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 77. Calm wind.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 97. Calm wind becoming north around 5 mph in the afternoon.

    High: 97 °F

    Hot

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms after 1am.  Mostly clear, with a low around 76. Light and variable wind.

    Low: 76 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91. South southwest wind 8 to 11 mph.
Tonight
Partly cloudy, with a low around 76. South wind 5 to 9 mph.
Sunday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 107. Southwest wind around 8 mph.
Sunday Night
Partly cloudy, with a low around 76. South southwest wind around 6 mph becoming calm in the evening.
Monday
Sunny, with a high near 95. Calm wind becoming west around 6 mph in the morning.
Monday Night
Mostly clear, with a low around 77. Calm wind.
Tuesday
Sunny and hot, with a high near 97. Calm wind becoming north around 5 mph in the afternoon.
Tuesday Night
A slight chance of showers and thunderstorms after 1am. Mostly clear, with a low around 76. Light and variable wind.
Wednesday
A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 95. Calm wind becoming east northeast around 5 mph in the afternoon.
Wednesday Night
A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 72. North northeast wind 3 to 6 mph.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 87. North northeast wind 6 to 10 mph.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 67. Northeast wind 7 to 10 mph.
Friday
A slight chance of showers. Mostly sunny, with a high near 83. Northeast wind 9 to 13 mph, with gusts as high as 18 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WNW Royalton IL
 37.9°N 89.14°W
5:31 am CDT Jul 26, 2025
8am CDT Jul 26, 2025-6pm CDT Aug 1, 2025
 
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Additional Resources

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