Hazardous Weather Conditions
Current conditions at
Southern Illinois Airport (KMDH)
Lat: 37.78°NLon: 89.25°WElev: 400ft.
Fair
84°F
29°C
| Humidity | 70% |
| Wind Speed | NA |
| Barometer | 29.90 in |
| Dewpoint | 73°F (23°C) |
| Visibility | 10.00 mi |
| Heat Index | 90°F (32°C) |
| Last update | 12 Aug 8:52 am CDT |
Extended Forecast for
Alto Pass IL
Heat Advisory August 12, 09:39am until August 14, 07:00pm
NOW until 7:00pm Fri
Heat Advisory
Today
High: 95 °F
Mostly Sunny
then Chance
T-stormsTonight
Low: 77 °F
Chance
ShowersThursday
High: 96 °F
Chance
Showers then
Mostly SunnyThursday Night
Low: 78 °F
Mostly Clear
Friday
High: 98 °F
Hot
Friday Night
Low: 77 °F
Mostly Clear
Saturday
High: 99 °F
Hot
Saturday Night
Low: 77 °F
Clear
Detailed Forecast
Today
A 50 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 95. Heat index values as high as 105. Southwest wind around 7 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly between 3am and 5am. Mostly cloudy, with a low around 77. South southwest wind around 6 mph becoming east southeast in the evening.
Thursday
A chance of showers and thunderstorms before 11am, then a slight chance of showers between 11am and noon. Mostly cloudy, then gradually becoming sunny, with a high near 96. Heat index values as high as 106. South southwest wind 6 to 9 mph. Chance of precipitation is 30%.
Thursday Night
Mostly clear, with a low around 78. South wind 6 to 8 mph.
Friday
Sunny and hot, with a high near 98. Southwest wind around 6 mph.
Friday Night
Mostly clear, with a low around 77. South wind around 5 mph.
Saturday
Sunny and hot, with a high near 99. Southwest wind 5 to 7 mph.
Saturday Night
Clear, with a low around 77. South wind around 6 mph.
Sunday
Sunny and hot, with a high near 100. South southwest wind 5 to 7 mph becoming west in the afternoon.
Sunday Night
Mostly clear, with a low around 75. West southwest wind around 5 mph becoming light and variable after midnight.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 92. North wind 3 to 6 mph.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 71. North wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 89. Calm wind becoming north around 5 mph.
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Alto Pass IL
37.57°N 89.32°W
37.57°N 89.32°W
6:06 am CDT Aug 12, 2026
9am CDT Aug 12, 2026-6pm CDT Aug 18, 2026
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