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.

Overcast

37°F

3°C

Humidity 75%
Wind Speed Calm
Barometer 29.95 in
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 15 Feb 2:35 am CST
Extended Forecast for

4 Miles WNW Castleton IL

  • Overnight

    Overnight: Patchy fog after 4am. Otherwise, partly cloudy, with a low around 28. Light and variable wind.

    Low: 28 °F

    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 11am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 60. Calm wind becoming northwest 5 to 8 mph in the morning.

    High: 60 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 37. Calm wind becoming south southwest 5 to 7 mph after midnight. Winds could gust as high as 15 mph.

    Low: 37 °F

    Increasing
    Clouds

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 65. Southwest wind 8 to 16 mph, with gusts as high as 26 mph.

    High: 65 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 42. South wind around 7 mph, with gusts as high as 15 mph.

    Low: 42 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 62. Southeast wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 26 mph.

    High: 62 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 40 percent chance of rain after midnight. Partly cloudy, with a low around 54. South wind around 18 mph, with gusts as high as 31 mph.

    Low: 54 °F

    Partly Cloudy
    then Chance
    Rain

  • Wednesday

    Wednesday: Sunny, with a high near 65. Breezy.

    High: 65 °F

    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

Detailed Forecast

Overnight
Patchy fog after 4am. Otherwise, partly cloudy, with a low around 28. Light and variable wind.
Sunday
Patchy fog before 11am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 60. Calm wind becoming northwest 5 to 8 mph in the morning.
Sunday Night
Increasing clouds, with a low around 37. Calm wind becoming south southwest 5 to 7 mph after midnight. Winds could gust as high as 15 mph.
Washington's Birthday
Mostly sunny, with a high near 65. Southwest wind 8 to 16 mph, with gusts as high as 26 mph.
Monday Night
Increasing clouds, with a low around 42. South wind around 7 mph, with gusts as high as 15 mph.
Tuesday
Mostly cloudy, with a high near 62. Southeast wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 26 mph.
Tuesday Night
A 40 percent chance of rain after midnight. Partly cloudy, with a low around 54. South wind around 18 mph, with gusts as high as 31 mph.
Wednesday
Sunny, with a high near 65. Breezy.
Wednesday Night
Mostly clear, with a low around 36.
Thursday
A 30 percent chance of rain after noon. Mostly sunny, with a high near 59.
Thursday Night
A chance of rain. Partly cloudy, with a low around 32.
Friday
A chance of rain and snow. Partly sunny, with a high near 44.
Friday Night
Mostly cloudy, with a low around 23.
Saturday
Mostly sunny, with a high near 40.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW Castleton IL
 41.14°N 89.77°W (Elev. 676 ft)
Last Update:
2:37 am CST Feb 15, 2026
Forecast Valid:
2am CST Feb 15, 2026-6pm CST Feb 21, 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