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

55°F

13°C

Humidity 93%
Wind Speed Calm
Barometer 29.95 in
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 19 Jun 3:55 am CDT
Extended Forecast for

Castleton IL

  • Juneteenth

    Juneteenth: Sunny, with a high near 78. Light west northwest wind increasing to 5 to 9 mph in the morning. Winds could gust as high as 16 mph.

    High: 78 °F

    Sunny

  • Tonight

    Tonight: A 40 percent chance of showers, mainly between 11pm and 5am. Mostly cloudy, with a low around 60. West wind 3 to 6 mph.

    Low: 60 °F

    Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 79. West wind 5 to 8 mph, with gusts as high as 15 mph.

    High: 79 °F

    Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 60. Calm wind becoming east around 5 mph after midnight.

    Low: 60 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers likely, then showers and possibly a thunderstorm after 1pm. Some of the storms could produce heavy rainfall. High near 73. East wind 8 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    High: 73 °F

    Heavy Rain

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 58. Breezy, with a north northeast wind 15 to 20 mph, with gusts as high as 28 mph. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 58 °F

    Showers
    Likely and
    Breezy

  • Monday

    Monday: Partly sunny, with a high near 74. North northeast wind 13 to 15 mph, with gusts as high as 22 mph.

    High: 74 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

Detailed Forecast

Juneteenth
Sunny, with a high near 78. Light west northwest wind increasing to 5 to 9 mph in the morning. Winds could gust as high as 16 mph.
Tonight
A 40 percent chance of showers, mainly between 11pm and 5am. Mostly cloudy, with a low around 60. West wind 3 to 6 mph.
Saturday
Sunny, with a high near 79. West wind 5 to 8 mph, with gusts as high as 15 mph.
Saturday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 60. Calm wind becoming east around 5 mph after midnight.
Sunday
Showers likely, then showers and possibly a thunderstorm after 1pm. Some of the storms could produce heavy rainfall. High near 73. East wind 8 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 58. Breezy, with a north northeast wind 15 to 20 mph, with gusts as high as 28 mph. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.
Monday
Partly sunny, with a high near 74. North northeast wind 13 to 15 mph, with gusts as high as 22 mph.
Monday Night
Partly cloudy, with a low around 54.
Tuesday
Mostly sunny, with a high near 77.
Tuesday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 59.
Wednesday
Mostly sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Mostly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Castleton IL
 41.1°N 89.68°W (Elev. 820 ft)
Last Update:
4:01 am CDT Jun 19, 2026
Forecast Valid:
4am CDT Jun 19, 2026-6pm CDT Jun 25, 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