Severe Thunderstorms in the Central Plains and Lower Missouri Valley; Heat Continues in the Southeast and Southwest

Severe thunderstorms capable of large hail and damaging wind gusts are forecast to impact the central Plains into the Lower Missouri Valley through this afternoon. Dangerous heat persists across the southern Plains, Southeast U.S. and Puerto Rico this week, and will return to the Southwest today. Read More >

Hazardous Weather Conditions

Current conditions at

Marshall County Airport (KC75)

Lat: 41.02°NLon: 89.39°WElev: 545ft.

Fair

68°F

20°C

Humidity 91%
Wind Speed Calm
Barometer 30.04 in
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 18 Aug 8:15 am CDT
Extended Forecast for

Tiskilwa IL

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly after 3pm.  Mostly cloudy, with a high near 81. Southwest wind 5 to 10 mph.

    High: 81 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 4am, then a slight chance of showers.  Mostly cloudy, with a low around 66. Southwest wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 66 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 79. Calm wind becoming northeast around 5 mph.

    High: 79 °F

    Decreasing
    Clouds

  • Wednesday Night

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

    Low: 61 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of showers, with thunderstorms also possible after 1am.  Partly cloudy, with a low around 65. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Mostly cloudy, with a high near 81. Southwest wind 5 to 10 mph.
Tonight
A chance of showers and thunderstorms before 4am, then a slight chance of showers. Mostly cloudy, with a low around 66. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 79. Calm wind becoming northeast around 5 mph.
Wednesday Night
Partly cloudy, with a low around 61. Northeast wind around 5 mph becoming calm.
Thursday
Sunny, with a high near 79.
Thursday Night
Mostly clear, with a low around 61.
Friday
Mostly sunny, with a high near 80.
Friday Night
A chance of showers, with thunderstorms also possible after 1am. Partly cloudy, with a low around 65. Chance of precipitation is 30%.
Saturday
Mostly sunny, with a high near 79.
Saturday Night
Mostly clear, with a low around 61.
Sunday
Mostly sunny, with a high near 77.
Sunday Night
Partly cloudy, with a low around 61.
Monday
Partly sunny, with a high near 77.
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ABOUT THIS FORECAST

 
Point Forecast:
Tiskilwa IL
 41.29°N 89.5°W (Elev. 535 ft)
5:31 am CDT Aug 18, 2026
8am CDT Aug 18, 2026-6pm CDT Aug 24, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database