Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Hazardous Weather Conditions

Current conditions at

Marshall County Airport (KC75)

Lat: 41.02°NLon: 89.39°WElev: 545ft.

Fair

73°F

23°C

Humidity 85%
Wind Speed SW 3 mph
Barometer 29.93 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 18 Aug 8:55 pm CDT
Extended Forecast for

Mark IL

  • Tonight

    Tonight: A chance of showers and thunderstorms between 3am and 4am, then a slight chance of showers.  Mostly cloudy, with a low around 67. West wind around 5 mph.  Chance of precipitation is 40%.

    Low: 67 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A slight chance of showers before 8am, then a slight chance of showers and thunderstorms between 8am and 9am.  Partly sunny, with a high near 79. Calm wind becoming northeast around 5 mph.  Chance of precipitation is 20%.

    High: 79 °F

    Slight Chance
    T-storms then
    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 61. Calm wind becoming northeast around 5 mph.

    Low: 61 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 79. Calm wind becoming east around 5 mph.

    High: 79 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

  • Friday

    Friday: A 30 percent chance of showers after 1pm.  Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 1am.  Partly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    T-storms

  • Saturday

    Saturday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

Detailed Forecast

Tonight
A chance of showers and thunderstorms between 3am and 4am, then a slight chance of showers. Mostly cloudy, with a low around 67. West wind around 5 mph. Chance of precipitation is 40%.
Wednesday
A slight chance of showers before 8am, then a slight chance of showers and thunderstorms between 8am and 9am. Partly sunny, with a high near 79. Calm wind becoming northeast around 5 mph. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 61. Calm wind becoming northeast around 5 mph.
Thursday
Sunny, with a high near 79. Calm wind becoming east around 5 mph.
Thursday Night
Mostly clear, with a low around 62.
Friday
A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 80.
Friday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 64.
Saturday
Sunny, with a high near 78.
Saturday Night
Mostly clear, with a low around 60.
Sunday
Mostly sunny, with a high near 76.
Sunday Night
Partly cloudy, with a low around 60.
Monday
Mostly sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 62.
Tuesday
Mostly sunny, with a high near 80.
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ABOUT THIS FORECAST

 
Point Forecast:
Mark IL
 41.26°N 89.24°W (Elev. 699 ft)
8:16 pm CDT Aug 18, 2026
9pm CDT Aug 18, 2026-6pm CDT Aug 25, 2026
 
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Additional Resources

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Hourly Weather Forecast

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