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

20°F

-7°C

Humidity 63%
Wind Speed Calm
Barometer 30.26 in
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Last update 23 Feb 11:35 pm CST
Extended Forecast for

Princeton IL

  • Tonight

    Tonight: Mostly cloudy, with a temperature rising to around 18 by 5am. Southwest wind 5 to 10 mph becoming south after midnight.

    Low: 15 °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 morning. 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 around 15 mph, with gusts as high as 25 mph.

    Low: 23 °F

    Gradual
    Clearing

  • Wednesday

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

    High: 37 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 25. New snow accumulation of 1 to 3 inches possible.

    Low: 25 °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 26.

    Low: 26 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 58.

    High: 58 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a temperature rising to around 18 by 5am. Southwest wind 5 to 10 mph becoming south after midnight.
Tuesday
Cloudy, with a high near 42. Breezy, with a south wind 10 to 15 mph increasing to 20 to 25 mph in the morning. 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 around 15 mph, with gusts as high as 25 mph.
Wednesday
Mostly 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 25. New snow accumulation of 1 to 3 inches possible.
Thursday
Mostly sunny, with a high near 41.
Thursday Night
Mostly clear, with a low around 26.
Friday
Sunny, with a high near 58.
Friday Night
Mostly clear, with a low around 31.
Saturday
Mostly sunny, with a high near 46.
Saturday Night
Mostly cloudy, with a low around 21.
Sunday
A 40 percent chance of snow. Partly sunny, with a high near 35.
Sunday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 20.
Monday
A 30 percent chance of snow. Partly sunny, with a high near 36.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton IL
 41.37°N 89.46°W (Elev. 709 ft)
Last Update:
10:42 pm CST Feb 23, 2026
Forecast Valid:
11pm CST Feb 23, 2026-6pm CST Mar 2, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation