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.

Fair

49°F

9°C

Humidity 81%
Wind Speed N 7 mph
Barometer 30.23 in
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 20 May 6:15 am CDT
Extended Forecast for

5 Miles NW Castleton IL

  • Today

    Today: Mostly sunny, with a high near 66. North northeast wind 8 to 10 mph, with gusts as high as 17 mph.

    High: 66 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 43. East northeast wind 7 to 10 mph, with gusts as high as 22 mph.

    Low: 43 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 68. East wind 10 to 13 mph, with gusts as high as 21 mph.

    High: 68 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 49. East northeast wind 10 to 13 mph, with gusts as high as 22 mph.

    Low: 49 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers likely, mainly after 1pm. Mostly cloudy, with a high near 66. East wind around 14 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 66 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 50 percent chance of showers before 1am. Mostly cloudy, with a low around 53. East northeast wind 5 to 11 mph, with gusts as high as 20 mph.

    Low: 53 °F

    Chance
    Showers

  • Saturday

    Saturday: Mostly cloudy, with a high near 75. North northeast wind 5 to 8 mph becoming west southwest in the afternoon.

    High: 75 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 56.

    Low: 56 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 79.

    High: 79 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 66. North northeast wind 8 to 10 mph, with gusts as high as 17 mph.
Tonight
Mostly clear, with a low around 43. East northeast wind 7 to 10 mph, with gusts as high as 22 mph.
Thursday
Mostly sunny, with a high near 68. East wind 10 to 13 mph, with gusts as high as 21 mph.
Thursday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 49. East northeast wind 10 to 13 mph, with gusts as high as 22 mph.
Friday
Showers likely, mainly after 1pm. Mostly cloudy, with a high near 66. East wind around 14 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
A 50 percent chance of showers before 1am. Mostly cloudy, with a low around 53. East northeast wind 5 to 11 mph, with gusts as high as 20 mph.
Saturday
Mostly cloudy, with a high near 75. North northeast wind 5 to 8 mph becoming west southwest in the afternoon.
Saturday Night
Mostly cloudy, with a low around 56.
Sunday
Partly sunny, with a high near 79.
Sunday Night
Mostly cloudy, with a low around 57.
Memorial Day
Partly sunny, with a high near 82.
Monday Night
Partly cloudy, with a low around 59.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles NW Castleton IL
 41.19°N 89.76°W (Elev. 751 ft)
Last Update:
5:36 am CDT May 20, 2026
Forecast Valid:
6am CDT May 20, 2026-6pm CDT May 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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