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

65°F

18°C

Humidity 81%
Wind Speed N 3 mph
Barometer 29.91 in (1012.7 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 18 Jun 11:52 pm CDT
Extended Forecast for

Grand Tower IL

Flood Warning June 19, 12:29am until June 19, 01:00pm
Click here for hazard details and duration
Flood Warning
  •  
    Flood Warning June 19, 12:29am until June 19, 01:00pm

    NOW until 1:00pm Fri

    Flood Warning

  • Overnight

    Low: 62 °F

    Partly Cloudy

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 85. Calm wind.

    High: 85 °F

    Mostly Sunny

  • Friday Night

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

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 87. Light south wind.

    High: 87 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Mostly clear, with a low around 67. Light south southeast wind.

    Low: 67 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 86. Light south southeast wind becoming south 9 to 14 mph in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 70%.

    High: 86 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 69. South wind 11 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 90%.

    Low: 69 °F

    Showers

  • Monday

    Monday: A chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 82. West southwest wind around 10 mph becoming north northwest in the afternoon.

    High: 82 °F

    Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 62. Calm wind.
Juneteenth
Mostly sunny, with a high near 85. Calm wind.
Friday Night
Partly cloudy, with a low around 64. Calm wind.
Saturday
Mostly sunny, with a high near 87. Light south wind.
Saturday Night
A 20 percent chance of showers after 1am. Mostly clear, with a low around 67. Light south southeast wind.
Sunday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 86. Light south southeast wind becoming south 9 to 14 mph in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 70%.
Sunday Night
Showers and possibly a thunderstorm. Low around 69. South wind 11 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 90%.
Monday
A chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 82. West southwest wind around 10 mph becoming north northwest in the afternoon.
Monday Night
A slight chance of showers after 1am. Partly cloudy, with a low around 63. North wind 3 to 8 mph.
Tuesday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83. Light north northwest wind.
Tuesday Night
A slight chance of showers. Partly cloudy, with a low around 63. Light north northeast wind.
Wednesday
Mostly sunny, with a high near 84. Light north wind.
Wednesday Night
Mostly clear, with a low around 64. Light and variable wind.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 85. Light and variable wind.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grand Tower IL
 37.64°N 89.52°W
Last Update:
11:11 pm CDT Jun 18, 2026
Forecast Valid:
12am CDT Jun 19, 2026-6pm CDT Jun 25, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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