National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat in the Central and Eastern U.S.; Critical Fire Weather in the Great Basin and Southwest

Dangerous, record-breaking heat will intensify across most of the central and eastern U.S this week. Heat indices will likely exceed 100 degrees. Heat is likely to continue across the eastern U.S. through the Independence Day holiday weekend. Critical fire weather conditions will continue Tuesday across portions of the Four Corners and Great Basin, as dry conditions and gusty winds persist. Read More >

Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

80°F

27°C

Humidity 85%
Wind Speed SW 7 mph
Barometer 30.01 in (1015.6 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 29 Jun 11:52 pm CDT
Extended Forecast for

3 Miles WSW Cobden IL

Extreme Heat Warning June 30, 12:54am until July 3, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning June 30, 12:54am until July 3, 08:00pm

    NOW until 8:00pm Fri

    Extreme Heat Warning

  • Overnight

    Low: 76 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94. Heat index values as high as 110. South southwest wind 3 to 7 mph.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 75. South southwest wind around 6 mph becoming calm in the evening.

    Low: 75 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 95. Heat index values as high as 108. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 95 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 76. Light south wind.

    Low: 76 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 96. Calm wind becoming south around 5 mph in the afternoon.

    High: 96 °F

    Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 76. Light and variable wind.

    Low: 76 °F

    Slight Chance
    T-storms

  • Friday

    Friday: Sunny, with a high near 95. Light south wind.

    High: 95 °F

    Sunny

Detailed Forecast

Overnight
Clear, with a low around 76. South southwest wind 3 to 5 mph.
Tuesday
Sunny, with a high near 94. Heat index values as high as 110. South southwest wind 3 to 7 mph.
Tuesday Night
Clear, with a low around 75. South southwest wind around 6 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 95. Heat index values as high as 108. Calm wind becoming south southwest around 6 mph in the afternoon.
Wednesday Night
Clear, with a low around 76. Light south wind.
Thursday
Sunny, with a high near 96. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 76. Light and variable wind.
Friday
Sunny, with a high near 95. Light south wind.
Friday Night
A slight chance of showers and thunderstorms before 1am. Mostly clear, with a low around 75. Light south wind.
Independence Day
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Calm wind.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 75. Calm wind.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 93. Light west wind.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 74. Calm wind.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 91. Calm wind becoming west northwest around 5 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Cobden IL
 37.52°N 89.33°W
Last Update:
11:21 pm CDT Jun 29, 2026
Forecast Valid:
12am CDT Jun 30, 2026-6pm CDT Jul 6, 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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation