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.

Partly Cloudy

90°F

32°C

Humidity 46%
Wind Speed Calm
Barometer 29.89 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 12 Sep 3:48 pm CDT
Extended Forecast for

Jonesboro IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 93. Calm wind.

    High: 93 °F

    Sunny

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, mostly clear, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: A 20 percent chance of showers after 3pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 92. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 92 °F

    Patchy Fog
    then Slight
    Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 68. Northeast wind 3 to 6 mph.

    Low: 68 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 89. East northeast wind around 7 mph.

    High: 89 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Clear, with a low around 70. East wind around 6 mph.

    Low: 70 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 96. South southwest wind 3 to 7 mph.

    High: 96 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 73. Light south southeast wind.

    Low: 73 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 95. Calm wind becoming south southwest around 6 mph in the morning.

    High: 95 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 93. Calm wind.
Tonight
Patchy fog after 3am. Otherwise, mostly clear, with a low around 68. Calm wind.
Sunday
A 20 percent chance of showers after 3pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 92. Calm wind becoming northwest around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 68. Northeast wind 3 to 6 mph.
Monday
Mostly sunny, with a high near 89. East northeast wind around 7 mph.
Monday Night
Clear, with a low around 70. East wind around 6 mph.
Tuesday
Sunny, with a high near 96. South southwest wind 3 to 7 mph.
Tuesday Night
Mostly clear, with a low around 73. Light south southeast wind.
Wednesday
Sunny, with a high near 95. Calm wind becoming south southwest around 6 mph in the morning.
Wednesday Night
Mostly clear, with a low around 72. Light southeast wind.
Thursday
A slight chance of showers and thunderstorms. Sunny, with a high near 92. Light and variable wind becoming south southwest around 5 mph in the morning.
Thursday Night
A slight chance of showers. Mostly clear, with a low around 68. Calm wind.
Friday
A slight chance of showers and thunderstorms. Sunny, with a high near 89. Calm wind becoming north northwest around 6 mph in the morning.
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ABOUT THIS FORECAST

 
Point Forecast:
Jonesboro IL
 37.46°N 89.27°W
Last Update:
4:31 pm CDT Sep 12, 2026
Forecast Valid:
4pm CDT Sep 12, 2026-6pm CDT Sep 18, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation