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

Illinois Valley Regional Airport (KVYS)

Lat: 41.35°NLon: 89.15°WElev: 650ft.

Fair

19°F

-7°C

Humidity 73%
Wind Speed S 5 mph
Barometer 30.18 in
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Wind Chill12°F (-11°C)
Last update 24 Feb 2:15 am CST
Extended Forecast for

Mark IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 16. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 16 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Cloudy, with a high near 42. Breezy, with a south wind 10 to 15 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 35 mph.

    High: 42 °F

    Cloudy and
    Breezy

  • Tuesday Night

    Tuesday Night: Cloudy during the early evening, then gradual clearing, with a low around 23. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 23 °F

    Gradual
    Clearing

  • Wednesday

    Wednesday: Sunny, with a high near 37. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 37 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 26. New snow accumulation of 1 to 2 inches possible.

    Low: 26 °F

    Chance Snow

  • Thursday

    Thursday: Mostly sunny, with a high near 41.

    High: 41 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 27.

    Low: 27 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 16. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
Cloudy, with a high near 42. Breezy, with a south wind 10 to 15 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 35 mph.
Tuesday Night
Cloudy during the early evening, then gradual clearing, with a low around 23. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday
Sunny, with a high near 37. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 26. New snow accumulation of 1 to 2 inches possible.
Thursday
Mostly sunny, with a high near 41.
Thursday Night
Mostly clear, with a low around 27.
Friday
Sunny, with a high near 57.
Friday Night
Mostly clear, with a low around 32.
Saturday
Mostly sunny, with a high near 47.
Saturday Night
Mostly cloudy, with a low around 22.
Sunday
A 40 percent chance of snow. Partly sunny, with a high near 36.
Sunday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 22.
Monday
A 30 percent chance of snow. Partly sunny, with a high near 35.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mark IL
 41.26°N 89.26°W (Elev. 699 ft)
Last Update:
10:42 pm CST Feb 23, 2026
Forecast Valid:
2am CST Feb 24, 2026-6pm CST Mar 2, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation