National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

77°F

25°C

Humidity 83%
Wind Speed SW 3 mph
Barometer 29.91 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 19 Aug 7:52 pm CDT
Extended Forecast for

5 Miles N Jacob IL

Flood Watch until August 20, 07:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch until August 20, 07:00am

    NOW until 7:00am Thu

    Flood Watch

  • Tonight

    Low: 68 °F

    Showers
    Likely then
    Chance
    T-storms

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 84. Calm wind becoming north northeast around 5 mph in the afternoon.

    High: 84 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 66. Calm wind.

    Low: 66 °F

    Mostly Clear

  • Friday

    Friday: Partly sunny, then gradually becoming sunny, with a high near 85. Calm wind.

    High: 85 °F

    Becoming
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 66. Calm wind.

    Low: 66 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 85. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 85 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 65. Calm wind.

    Low: 65 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 83. Light north wind.

    High: 83 °F

    Sunny

Detailed Forecast

Tonight
Showers and thunderstorms likely, mainly before 11pm. Mostly cloudy, with a low around 68. Light and variable wind. Chance of precipitation is 60%.
Thursday
A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 84. Calm wind becoming north northeast around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 66. Calm wind.
Friday
Partly sunny, then gradually becoming sunny, with a high near 85. Calm wind.
Friday Night
Mostly clear, with a low around 66. Calm wind.
Saturday
Sunny, with a high near 85. Calm wind becoming northwest around 6 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 65. Calm wind.
Sunday
Sunny, with a high near 83. Light north wind.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 64. Light and variable wind.
Monday
A slight chance of showers before 1pm. Mostly sunny, with a high near 84. Light south southeast wind.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 66. East southeast wind 3 to 5 mph.
Tuesday
Mostly sunny, with a high near 86. South southeast wind around 6 mph.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 67. Light east northeast wind.
Wednesday
Mostly sunny, with a high near 88. Calm wind becoming northwest around 5 mph in the afternoon.
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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:
5:41 pm CDT Aug 19, 2026
Forecast Valid:
8pm CDT Aug 19, 2026-6pm CDT Aug 26, 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