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

19°F

-7°C

Humidity 63%
Wind Speed SE 3 mph
Barometer 30.35 in
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Last update 8 Dec 11:35 am CST
Extended Forecast for

Castleton IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 23. South wind around 7 mph.

    High: 23 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a temperature falling to near 18 by 8pm, then rising to around 27 during the remainder of the night. South wind 6 to 15 mph, with gusts as high as 28 mph.

    Low: 18 °F⇑

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 40. Southwest wind 10 to 14 mph, with gusts as high as 23 mph.

    High: 40 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Rain likely, mainly before midnight. Mostly cloudy, with a steady temperature around 38. Breezy, with a south southwest wind 14 to 24 mph becoming west after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 38 °F

    Rain Likely
    and Breezy

  • Wednesday

    Wednesday: Mostly cloudy, with a temperature falling to around 27 by 5pm. Breezy, with a northwest wind 15 to 24 mph, with gusts as high as 34 mph.

    High: 36 °F⇓

    Mostly Cloudy
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 17. West northwest wind 6 to 13 mph, with gusts as high as 21 mph.

    Low: 17 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of snow. Mostly cloudy, with a high near 26. West southwest wind around 6 mph.

    High: 26 °F

    Chance Snow

  • Thursday Night

    Thursday Night: A 30 percent chance of snow before midnight. Mostly cloudy, with a low around 11.

    Low: 11 °F

    Chance Snow
    then Mostly
    Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 19.

    High: 19 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 23. South wind around 7 mph.
Tonight
Mostly cloudy, with a temperature falling to near 18 by 8pm, then rising to around 27 during the remainder of the night. South wind 6 to 15 mph, with gusts as high as 28 mph.
Tuesday
Mostly cloudy, with a high near 40. Southwest wind 10 to 14 mph, with gusts as high as 23 mph.
Tuesday Night
Rain likely, mainly before midnight. Mostly cloudy, with a steady temperature around 38. Breezy, with a south southwest wind 14 to 24 mph becoming west after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Mostly cloudy, with a temperature falling to around 27 by 5pm. Breezy, with a northwest wind 15 to 24 mph, with gusts as high as 34 mph.
Wednesday Night
Mostly cloudy, with a low around 17. West northwest wind 6 to 13 mph, with gusts as high as 21 mph.
Thursday
A 30 percent chance of snow. Mostly cloudy, with a high near 26. West southwest wind around 6 mph.
Thursday Night
A 30 percent chance of snow before midnight. Mostly cloudy, with a low around 11.
Friday
Mostly cloudy, with a high near 19.
Friday Night
Mostly cloudy, with a low around -2.
Saturday
Partly sunny and cold, with a high near 9.
Saturday Night
Mostly cloudy, with a low around -1.
Sunday
Mostly sunny, with a high near 17.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Castleton IL
 41.12°N 89.71°W (Elev. 768 ft)
Last Update:
11:36 am CST Dec 8, 2025
Forecast Valid:
12pm CST Dec 8, 2025-6pm CST Dec 14, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation