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

86°F

30°C

Humidity 43%
Wind Speed S 8 mph
Barometer 30.18 in (1021.6 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 3 Oct 3:52 pm CDT
Extended Forecast for

Alto Pass IL

  • This Afternoon

    This Afternoon: Sunny, with a steady temperature around 83. Light south wind.

    High: 83 °F

    Sunny

  • Tonight

    Tonight: A slight chance of sprinkles before 8pm. Clear, with a low around 60. Light south wind.

    Low: 60 °F

    Slight Chance
    Sprinkles

  • Saturday

    Saturday: Sunny, with a high near 84. Calm wind becoming southeast 5 to 7 mph in the morning.

    High: 84 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 58. Light southeast wind.

    Low: 58 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 83. South wind 5 to 8 mph.

    High: 83 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 65. Southeast wind 3 to 5 mph.

    Low: 65 °F

    Mostly Clear

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 81. South southeast wind 3 to 6 mph. Chance of precipitation is 30%.

    High: 81 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 64. Light east southeast wind.

    Low: 64 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Partly sunny, with a high near 80. Calm wind becoming north around 6 mph in the afternoon.

    High: 80 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a steady temperature around 83. Light south wind.
Tonight
A slight chance of sprinkles before 8pm. Clear, with a low around 60. Light south wind.
Saturday
Sunny, with a high near 84. Calm wind becoming southeast 5 to 7 mph in the morning.
Saturday Night
Clear, with a low around 58. Light southeast wind.
Sunday
Sunny, with a high near 83. South wind 5 to 8 mph.
Sunday Night
Mostly clear, with a low around 65. Southeast wind 3 to 5 mph.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 81. South southeast wind 3 to 6 mph. Chance of precipitation is 30%.
Monday Night
A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 64. Light east southeast wind.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 80. Calm wind becoming north around 6 mph in the afternoon.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 60. North northeast wind 6 to 8 mph.
Wednesday
Mostly sunny, with a high near 74. Northeast wind around 9 mph.
Wednesday Night
Mostly clear, with a low around 55. Northeast wind around 7 mph.
Thursday
Sunny, with a high near 73. East wind around 7 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Alto Pass IL
 37.57°N 89.32°W
Last Update:
4:02 pm CDT Oct 3, 2025
Forecast Valid:
4pm CDT Oct 3, 2025-6pm CDT Oct 9, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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