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

72°F

22°C

Humidity 73%
Wind Speed Vrbl 3 mph
Barometer 30.05 in (1017.4 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 19 Jun 8:52 am CDT
Extended Forecast for

Grand Tower IL

Flood Warning June 19, 09:26am until June 19, 01:00pm
Click here for hazard details and duration
Flood Warning
  •  
    Flood Warning June 19, 09:26am until June 19, 01:00pm

    NOW until 1:00pm Fri

    Flood Warning

  • Juneteenth

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 87. Calm wind becoming south around 5 mph in the afternoon.

    High: 87 °F

    Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Mostly clear, with a low around 68. South southeast wind around 5 mph becoming calm in the evening.

    Low: 68 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: Showers likely, then showers and possibly a thunderstorm after 10am. High near 87. South wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 80%.

    High: 87 °F

    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 70. Southwest wind 10 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.

    Low: 70 °F

    T-storms then
    Showers

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 82. West southwest wind around 9 mph becoming north northwest in the afternoon.

    High: 82 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 63. North wind 5 to 8 mph becoming calm in the evening.

    Low: 63 °F

    Slight Chance
    T-storms

Detailed Forecast

Juneteenth
Sunny, with a high near 85. Calm wind.
Tonight
Partly cloudy, with a low around 64. Calm wind.
Saturday
Sunny, with a high near 87. Calm wind becoming south around 5 mph in the afternoon.
Saturday Night
A 20 percent chance of showers after 1am. Mostly clear, with a low around 68. South southeast wind around 5 mph becoming calm in the evening.
Sunday
Showers likely, then showers and possibly a thunderstorm after 10am. High near 87. South wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 80%.
Sunday Night
Showers and possibly a thunderstorm. Low around 70. Southwest wind 10 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.
Monday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 82. West southwest wind around 9 mph becoming north northwest in the afternoon.
Monday Night
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 63. North wind 5 to 8 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 82. Light north northwest wind.
Tuesday Night
Mostly clear, with a low around 63. Light north wind.
Wednesday
A slight chance of showers and thunderstorms. Sunny, with a high near 84. Light west northwest wind.
Wednesday Night
A slight chance of showers. Mostly clear, with a low around 64. Calm wind.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 85. Calm wind becoming south around 5 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grand Tower IL
 37.64°N 89.52°W
Last Update:
9:11 am CDT Jun 19, 2026
Forecast Valid:
9am CDT Jun 19, 2026-6pm CDT Jun 25, 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