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

79°F

26°C

Humidity 26%
Wind Speed N 8 mph
Barometer 30.23 in (1023.3 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 26 Aug 2:52 pm CDT
Extended Forecast for

Alto Pass IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 77. North wind around 7 mph.

    High: 77 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 49. North wind around 5 mph becoming calm in the evening.

    Low: 49 °F

    Clear

  • Wednesday

    Wednesday: Increasing clouds, with a high near 80. Light and variable wind.

    High: 80 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 58. Calm wind.

    Low: 58 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers after 1pm. Partly sunny, with a high near 79. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 79 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 56. Calm wind.

    Low: 56 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 83. Calm wind becoming northeast around 6 mph in the afternoon.

    High: 83 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 58. Northeast wind around 6 mph.

    Low: 58 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 81. Northeast wind around 7 mph.

    High: 81 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 77. North wind around 7 mph.
Tonight
Clear, with a low around 49. North wind around 5 mph becoming calm in the evening.
Wednesday
Increasing clouds, with a high near 80. Light and variable wind.
Wednesday Night
Mostly cloudy, with a low around 58. Calm wind.
Thursday
A 20 percent chance of showers after 1pm. Partly sunny, with a high near 79. Calm wind becoming south southwest around 6 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 56. Calm wind.
Friday
Mostly sunny, with a high near 83. Calm wind becoming northeast around 6 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 58. Northeast wind around 6 mph.
Saturday
Sunny, with a high near 81. Northeast wind around 7 mph.
Saturday Night
Mostly clear, with a low around 58. Northeast wind around 6 mph.
Sunday
Sunny, with a high near 82. Northeast wind 5 to 8 mph.
Sunday Night
Mostly clear, with a low around 58. Northeast wind 3 to 6 mph.
Labor Day
Sunny, with a high near 84. Northeast wind 3 to 6 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:
1:30 pm CDT Aug 26, 2025
Forecast Valid:
3pm CDT Aug 26, 2025-6pm CDT Sep 1, 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