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.

Thunderstorm in Vicinity

74°F

23°C

Humidity 85%
Wind Speed S 6 mph
Barometer 29.93 in (1013.3 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 4 Jul 4:52 pm CDT
Extended Forecast for

2 Miles ESE Grand Tower IL

Heat Advisory July 4, 04:58pm until July 4, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 4, 04:58pm until July 4, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • Independence Day

    High: 92 °F

    Heavy Rain

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 1am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 72. Light and variable wind. Chance of precipitation is 60%.

    Low: 72 °F

    Heavy Rain

  • Sunday

    Sunday: A slight chance of showers and thunderstorms before 2pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 90. Light northwest wind. Chance of precipitation is 20%.

    High: 90 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 71. Light and variable wind.

    Low: 71 °F

    Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. Calm wind becoming north northeast around 5 mph in the afternoon. Chance of precipitation is 40%.

    High: 88 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 70. Light north northeast wind.

    Low: 70 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Light north northeast wind.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 70. Light northeast wind.

    Low: 70 °F

    Mostly Clear

Detailed Forecast

Independence Day
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5pm. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 92. Southwest wind around 5 mph. Chance of precipitation is 60%.
Tonight
Showers and thunderstorms likely, mainly before 1am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 72. Light and variable wind. Chance of precipitation is 60%.
Sunday
A slight chance of showers and thunderstorms before 2pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 90. Light northwest wind. Chance of precipitation is 20%.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 71. Light and variable wind.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. Calm wind becoming north northeast around 5 mph in the afternoon. Chance of precipitation is 40%.
Monday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 70. Light north northeast wind.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Light north northeast wind.
Tuesday Night
Mostly clear, with a low around 70. Light northeast wind.
Wednesday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Calm wind.
Wednesday Night
Mostly clear, with a low around 73. Calm wind.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 93. Southwest wind 3 to 7 mph.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 74. South southwest wind 5 to 7 mph.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 91. Southwest wind 5 to 7 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ESE Grand Tower IL
 37.62°N 89.46°W
Last Update:
4:36 pm CDT Jul 4, 2026
Forecast Valid:
4pm CDT Jul 4, 2026-6pm CDT Jul 10, 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