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

Alto Pass IL

  • Overnight

    Overnight: Partly cloudy, with a steady temperature around 67. Calm wind.

    Low: 67 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 86. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 86 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 64. Light south southeast wind.

    Low: 64 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 84. South southwest wind 3 to 6 mph.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 60. Light south wind.

    Low: 60 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 83. Calm wind becoming south southeast around 6 mph in the afternoon.

    High: 83 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 60. Southeast wind 3 to 5 mph.

    Low: 60 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 84. South wind 5 to 9 mph.

    High: 84 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 64. Light southeast wind.

    Low: 64 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a steady temperature around 67. Calm wind.
Thursday
A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 86. Calm wind becoming south southwest around 6 mph in the afternoon.
Thursday Night
A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 64. Light south southeast wind.
Friday
Sunny, with a high near 84. South southwest wind 3 to 6 mph.
Friday Night
Clear, with a low around 60. Light south wind.
Saturday
Sunny, with a high near 83. Calm wind becoming south southeast around 6 mph in the afternoon.
Saturday Night
Clear, with a low around 60. Southeast wind 3 to 5 mph.
Sunday
Sunny, with a high near 84. South wind 5 to 9 mph.
Sunday Night
Mostly clear, with a low around 64. Light southeast wind.
Monday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 81. South southeast wind 3 to 6 mph.
Monday Night
A slight chance of showers. Partly cloudy, with a low around 64. Light southeast wind.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 81. Light and variable wind becoming south southwest around 6 mph in the morning.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 61. Light and variable wind becoming north northwest around 6 mph in the evening.
Wednesday
Mostly sunny, with a high near 76. North wind 7 to 9 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Alto Pass IL
 37.57°N 89.32°W
Last Update:
2:00 am CDT Oct 2, 2025
Forecast Valid:
3am CDT Oct 2, 2025-6pm CDT Oct 8, 2025
 
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