National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Marshall County Airport (KC75)

Lat: 41.02°NLon: 89.39°WElev: 545ft.

Partly Cloudy

18°C

64°F

Humidity 50%
Wind Speed E 22 km/h
Barometer 30.22 in
Dewpoint 7°C (45°F)
Visibility 16 km
Last update 21 May 10:55 am CDT
Extended Forecast for

4 Miles WNW Castleton IL

  • Today

    Today: Partly sunny, with a high near 21. East wind 18 to 21 km/h, with gusts as high as 32 km/h.

    High: 21 °C

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 11. East northeast wind 13 to 21 km/h, with gusts as high as 39 km/h.

    Low: 11 °C

    Mostly Cloudy

  • Friday

    Friday: A 40 percent chance of showers, mainly after 1pm. Mostly cloudy, with a high near 19. East wind 16 to 21 km/h, with gusts as high as 37 km/h.

    High: 19 °C

    Mostly Cloudy
    then Chance
    Showers

  • Friday Night

    Friday Night: A 50 percent chance of showers. Cloudy, with a low around 13. East northeast wind 8 to 18 km/h, with gusts as high as 34 km/h.

    Low: 13 °C

    Chance
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 25. West wind 10 to 13 km/h.

    High: 25 °C

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 13. West wind 5 to 8 km/h becoming calm in the evening.

    Low: 13 °C

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 27. West wind 3 to 8 km/h.

    High: 27 °C

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 14.

    Low: 14 °C

    Partly Cloudy

  • Memorial Day

    Memorial Day: Mostly sunny, with a high near 28.

    High: 28 °C

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 21. East wind 18 to 21 km/h, with gusts as high as 32 km/h.
Tonight
Mostly cloudy, with a low around 11. East northeast wind 13 to 21 km/h, with gusts as high as 39 km/h.
Friday
A 40 percent chance of showers, mainly after 1pm. Mostly cloudy, with a high near 19. East wind 16 to 21 km/h, with gusts as high as 37 km/h.
Friday Night
A 50 percent chance of showers. Cloudy, with a low around 13. East northeast wind 8 to 18 km/h, with gusts as high as 34 km/h.
Saturday
Partly sunny, with a high near 25. West wind 10 to 13 km/h.
Saturday Night
Mostly cloudy, with a low around 13. West wind 5 to 8 km/h becoming calm in the evening.
Sunday
Partly sunny, with a high near 27. West wind 3 to 8 km/h.
Sunday Night
Partly cloudy, with a low around 14.
Memorial Day
Mostly sunny, with a high near 28.
Monday Night
Partly cloudy, with a low around 15.
Tuesday
Partly sunny, with a high near 29.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 17.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 29.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW Castleton IL
 41.14°N 89.77°W (Elev. 676 m)
Last Update:
10:36 am CDT May 21, 2026
Forecast Valid:
11am CDT May 21, 2026-6pm CDT May 27, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation