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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Ava IL

Extreme Heat Warning August 15, 06:55am until August 16, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 15, 06:55am until August 16, 08:00pm

    NOW until 8:00pm Sun

    Extreme Heat Warning

  • Today

    High: 96 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 75. South southwest wind 3 to 6 mph.

    Low: 75 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny and hot, with a high near 97. Heat index values as high as 111. West wind around 6 mph.

    High: 97 °F

    Hot

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. North wind 3 to 5 mph. Chance of precipitation is 50%.

    Low: 72 °F

    Chance
    T-storms then
    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 86. North wind around 6 mph.

    High: 86 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 66. Light north wind.

    Low: 66 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 89. Calm wind.

    High: 89 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 71. Calm wind becoming south 5 to 8 mph in the evening.

    Low: 71 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 96. Heat index values as high as 109. Light and variable wind becoming south southwest around 5 mph in the morning.
Tonight
Mostly clear, with a low around 75. South southwest wind 3 to 6 mph.
Sunday
Mostly sunny and hot, with a high near 97. Heat index values as high as 111. West wind around 6 mph.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. North wind 3 to 5 mph. Chance of precipitation is 50%.
Monday
Mostly sunny, with a high near 86. North wind around 6 mph.
Monday Night
Mostly cloudy, with a low around 66. Light north wind.
Tuesday
Sunny, with a high near 89. Calm wind.
Tuesday Night
Mostly clear, with a low around 71. Calm wind becoming south 5 to 8 mph in the evening.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 93. South southwest wind 7 to 10 mph becoming west northwest in the afternoon.
Wednesday Night
A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 68. North wind 6 to 8 mph.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 83. North northeast wind 5 to 7 mph.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 63. Northeast wind around 6 mph.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 82. East northeast wind around 6 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Ava IL
 37.89°N 89.5°W
Last Update:
6:01 am CDT Aug 15, 2026
Forecast Valid:
6am CDT Aug 15, 2026-6pm CDT Aug 21, 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