Severe Weather and Heavy Rain for the Plains and Mid-Atlantic; Building Heat in the West

Severe thunderstorms will remain possible in the Mid-Atlantic through Tuesday. Severe thunderstorms and heavy rain will also be possible in the central/southern Plains on Tuesday and Wednesday. Hazardous heat will linger across the southern U.S. and build across the West through mid-week. Hot and dry weather will create Elevated to Critical fire weather conditions in the Four Corners Region. Read More >

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Overcast

69°F

21°C

Humidity 76%
Wind Speed N 7 mph
Barometer 30.06 in (1017.6 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 22 Jun 7:52 pm CDT
Extended Forecast for

Grand Tower IL

  • Tonight

    Tonight: Partly cloudy, with a low around 61. Light north wind.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 84. Light north wind.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 63. Light and variable wind.

    Low: 63 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm.  Partly sunny, with a high near 85. Calm wind becoming south around 5 mph.  Chance of precipitation is 40%.

    High: 85 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers.  Mostly cloudy, with a low around 67. Light south wind.  Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 1pm.  Partly sunny, with a high near 87. Calm wind.

    High: 87 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am.  Mostly cloudy, with a low around 68. Light south southeast wind.  Chance of precipitation is 60%.

    Low: 68 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm.  Mostly cloudy, with a high near 86. Calm wind becoming south southwest 5 to 7 mph in the morning.

    High: 86 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm.  Mostly cloudy, with a low around 72. South southwest wind around 6 mph.

    Low: 72 °F

    Showers
    Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 61. Light north wind.
Tuesday
Sunny, with a high near 84. Light north wind.
Tuesday Night
Partly cloudy, with a low around 63. Light and variable wind.
Wednesday
A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 85. Calm wind becoming south around 5 mph. Chance of precipitation is 40%.
Wednesday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 67. Light south wind. Chance of precipitation is 30%.
Thursday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 87. Calm wind.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 68. Light south southeast wind. Chance of precipitation is 60%.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 86. Calm wind becoming south southwest 5 to 7 mph in the morning.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 72. South southwest wind around 6 mph.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 89. South southwest wind 5 to 9 mph.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. South wind 7 to 9 mph.
Sunday
A slight chance of showers and thunderstorms. Sunny, with a high near 92. South southwest wind 8 to 17 mph, with gusts as high as 26 mph.
Sunday Night
Mostly clear, with a low around 77. South wind 9 to 16 mph, with gusts as high as 24 mph.
Monday
Sunny, with a high near 94. South southwest wind 8 to 15 mph, with gusts as high as 23 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Grand Tower IL
 37.64°N 89.52°W
7:40 pm CDT Jun 22, 2026
8pm CDT Jun 22, 2026-6pm CDT Jun 29, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database