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

2 Miles N Saint Johns IL

Extreme Heat Warning until July 28, 07:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning until July 28, 07:00pm

    NOW until 7:00pm Tue

    Extreme Heat Warning

  • Overnight

    Low: 77 °F

    Slight Chance
    T-storms

  • Monday

    Monday: Sunny and hot, with a high near 99. Heat index values as high as 115. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 99 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 78. South southwest wind 3 to 6 mph.

    Low: 78 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. Heat index values as high as 105. North northwest wind 5 to 10 mph.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 69. North northeast wind 3 to 8 mph.

    Low: 69 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88. North wind 3 to 7 mph.

    High: 88 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 66. North northeast wind around 5 mph becoming calm  in the evening.

    Low: 66 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 90. Light east northeast wind.

    High: 90 °F

    Sunny

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 77. Calm wind.
Monday
Sunny and hot, with a high near 99. Heat index values as high as 115. Calm wind becoming southwest around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 78. South southwest wind 3 to 6 mph.
Tuesday
Sunny, with a high near 93. Heat index values as high as 105. North northwest wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 69. North northeast wind 3 to 8 mph.
Wednesday
Sunny, with a high near 88. North wind 3 to 7 mph.
Wednesday Night
Mostly clear, with a low around 66. North northeast wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 90. Light east northeast wind.
Thursday Night
A slight chance of showers after 1am. Partly cloudy, with a low around 68. Calm wind.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 88. Calm wind becoming south around 6 mph in the afternoon.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. South wind around 6 mph becoming calm in the evening.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 84. Light east northeast wind becoming north northeast 5 to 9 mph in the morning.
Saturday Night
Partly cloudy, with a low around 68. North northeast wind 5 to 8 mph becoming calm in the evening.
Sunday
A slight chance of showers and thunderstorms. Sunny, with a high near 86. North northeast wind 3 to 8 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles N Saint Johns IL
 38.06°N 89.24°W
11:46 pm CDT Jul 26, 2026
12am CDT Jul 27, 2026-6pm CDT Aug 2, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

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