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.

Fair

51°F

11°C

Humidity 89%
Wind Speed Calm
Barometer 29.99 in (1015.5 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 7 Oct 7:52 am CDT
Extended Forecast for

Alto Pass IL

  • Today

    Today: Sunny, with a high near 84. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 84 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 59. South southwest wind around 5 mph becoming calm in the evening.

    Low: 59 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 82. North northeast wind 3 to 5 mph.

    High: 82 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 57. Calm wind.

    Low: 57 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 84. Light and variable wind becoming south southeast around 6 mph in the morning.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 60. Calm wind becoming south southeast around 5 mph after midnight.

    Low: 60 °F

    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 80. South southeast wind 5 to 8 mph.

    High: 80 °F

    Mostly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely, with thunderstorms also possible after 1am. Partly cloudy, with a low around 59. East northeast wind around 8 mph.

    Low: 59 °F

    Showers
    Likely

  • Sunday

    Sunday: A chance of showers, mainly before 1pm. Partly sunny, with a high near 74. Northeast wind around 10 mph becoming north northwest in the afternoon.

    High: 74 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 84. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Tonight
Clear, with a low around 59. South southwest wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 82. North northeast wind 3 to 5 mph.
Thursday Night
Clear, with a low around 57. Calm wind.
Friday
Sunny, with a high near 84. Light and variable wind becoming south southeast around 6 mph in the morning.
Friday Night
Mostly clear, with a low around 60. Calm wind becoming south southeast around 5 mph after midnight.
Saturday
A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 80. South southeast wind 5 to 8 mph.
Saturday Night
Showers likely, with thunderstorms also possible after 1am. Partly cloudy, with a low around 59. East northeast wind around 8 mph.
Sunday
A chance of showers, mainly before 1pm. Partly sunny, with a high near 74. Northeast wind around 10 mph becoming north northwest in the afternoon.
Sunday Night
Partly cloudy, with a low around 58. Light and variable wind.
Columbus Day
Mostly sunny, with a high near 78. Calm wind becoming west southwest around 6 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 59. South wind 3 to 5 mph.
Tuesday
A slight chance of showers. Mostly sunny, with a high near 79. Southwest wind 5 to 9 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Alto Pass IL
 37.57°N 89.32°W
Last Update:
9:16 am CDT Oct 7, 2026
Forecast Valid:
9am CDT Oct 7, 2026-6pm CDT Oct 13, 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