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

88°F

31°C

Humidity 43%
Wind Speed SE 6 mph
Barometer 30.01 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 25 Aug 3:54 pm CDT
Extended Forecast for

Jonesboro IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 90. Light east southeast wind.

    High: 90 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of showers before noon, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 91. Light and variable wind. Chance of precipitation is 30%.

    High: 91 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Calm wind. Chance of precipitation is 30%.

    Low: 69 °F

    Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 88. Calm wind becoming north 5 to 8 mph in the afternoon.

    High: 88 °F

    Mostly Sunny

  • Thursday Night

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

    Low: 66 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 88. North northeast wind 3 to 7 mph.

    High: 88 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 63. North northeast wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 88. Calm wind.

    High: 88 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 90. Light east southeast wind.
Tonight
Partly cloudy, with a low around 68. Calm wind.
Wednesday
A chance of showers before noon, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 91. Light and variable wind. Chance of precipitation is 30%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Calm wind. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 88. Calm wind becoming north 5 to 8 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 66. Light north wind.
Friday
Sunny, with a high near 88. North northeast wind 3 to 7 mph.
Friday Night
Clear, with a low around 63. North northeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 88. Calm wind.
Saturday Night
Mostly clear, with a low around 66. Calm wind.
Sunday
Sunny, with a high near 93. Calm wind becoming south southwest 5 to 7 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 70. Light south wind.
Monday
Sunny, with a high near 95. South southwest wind 3 to 8 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Jonesboro IL
 37.46°N 89.27°W
Last Update:
4:01 pm CDT Aug 25, 2026
Forecast Valid:
4pm CDT Aug 25, 2026-6pm CDT Aug 31, 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