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Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

80°F

27°C

Humidity 87%
Wind Speed E 3 mph
Barometer 30.00 in (1015.3 mb)
Dewpoint 76°F (24°C)
Visibility 7.00 mi
Heat Index85°F (29°C)
Last update 17 Aug 9:52 pm CDT
Extended Forecast for

5 Miles N Jacob IL

Heat Advisory August 17, 10:43pm until August 19, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 17, 10:43pm until August 19, 07:00pm

    NOW until 7:00pm Tue

    Heat Advisory

  • Tonight

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 96. Heat index values as high as 106. Calm wind.

    High: 96 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 74. Light east southeast wind.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 95. Light and variable wind.

    High: 95 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Light and variable wind. Chance of precipitation is 40%.

    Low: 73 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 88. North wind 3 to 7 mph. Chance of precipitation is 30%.

    High: 88 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 67. North northeast wind around 7 mph.

    Low: 67 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 86. North wind 6 to 8 mph.

    High: 86 °F

    Mostly Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 74. Calm wind.
Monday
Sunny, with a high near 96. Heat index values as high as 106. Calm wind.
Monday Night
Mostly clear, with a low around 74. Light east southeast wind.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 95. Light and variable wind.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Light and variable wind. Chance of precipitation is 40%.
Wednesday
A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 88. North wind 3 to 7 mph. Chance of precipitation is 30%.
Wednesday Night
Partly cloudy, with a low around 67. North northeast wind around 7 mph.
Thursday
Mostly sunny, with a high near 86. North wind 6 to 8 mph.
Thursday Night
Mostly clear, with a low around 66. North northeast wind around 6 mph becoming calm in the evening.
Friday
Sunny, with a high near 88. Calm wind becoming north around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 67. North wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 89. Calm wind becoming north northwest around 6 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 63. North wind 3 to 6 mph.
Sunday
Sunny, with a high near 83. North northwest wind 3 to 7 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles N Jacob IL
 37.82°N 89.56°W
Last Update:
10:30 pm CDT Aug 17, 2025
Forecast Valid:
10pm CDT Aug 17, 2025-6pm CDT Aug 24, 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