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

Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

82°F

28°C

Humidity 70%
Wind Speed SW 8 mph
Barometer 30.08 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 31 Aug 8:52 am CDT
Extended Forecast for

Carbondale IL

Heat Advisory until September 4, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until September 4, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Today

    High: 95 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 76. South wind 3 to 5 mph.

    Low: 76 °F

    Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99. Heat index values as high as 105. South southwest wind 3 to 6 mph.

    High: 99 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 77. South wind 3 to 5 mph.

    Low: 77 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 99. Calm wind becoming southwest 5 to 7 mph in the morning.

    High: 99 °F

    Hot

  • Wednesday Night

    Wednesday Night: Clear, with a low around 77. South wind around 5 mph becoming calm in the evening.

    Low: 77 °F

    Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 100. Calm wind becoming south southwest 5 to 7 mph in the morning.

    High: 100 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 78. Light south wind.

    Low: 78 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 95. South southwest wind around 8 mph.
Tonight
Clear, with a low around 76. South wind 3 to 5 mph.
Tuesday
Sunny and hot, with a high near 99. Heat index values as high as 105. South southwest wind 3 to 6 mph.
Tuesday Night
Clear, with a low around 77. South wind 3 to 5 mph.
Wednesday
Sunny and hot, with a high near 99. Calm wind becoming southwest 5 to 7 mph in the morning.
Wednesday Night
Clear, with a low around 77. South wind around 5 mph becoming calm in the evening.
Thursday
Sunny and hot, with a high near 100. Calm wind becoming south southwest 5 to 7 mph in the morning.
Thursday Night
Mostly clear, with a low around 78. Light south wind.
Friday
Sunny and hot, with a high near 99. Calm wind becoming south around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 76. Calm wind.
Saturday
Sunny and hot, with a high near 97. Calm wind becoming north northwest around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 73. Calm wind.
Sunday
Mostly sunny, with a high near 93. Calm wind becoming northeast around 6 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Carbondale IL
 37.72°N 89.23°W
Last Update:
10:50 am CDT Aug 31, 2026
Forecast Valid:
10am CDT Aug 31, 2026-6pm CDT Sep 6, 2026
 
Forecast Discussion
 
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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