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7-Day Forecast 41.34°N 89.14°W (Text-Only)
NWS Forecast for: Illinois Valley Rgnl-Walter A Duncan Field Airport IL
Issued by: National Weather Service Chicago, IL
Last Update: 10:11 pm CDT Jul 14, 2025		Print

  • Overnight

    Overnight: Mostly clear, with a low around 66. Calm wind becoming east around 5 mph.

    Low: 66 °F

    Mostly Clear



  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 88. Calm wind becoming south around 5 mph in the morning.

    High: 88 °F

    Sunny then
    Slight Chance
    T-storms

  • Tuesday
    Night

    Tuesday Night: A 10 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 70. South wind around 5 mph, with gusts as high as 10 mph.

    Low: 70 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Heat index values as high as 97. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 90 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday
    Night

    Wednesday Night: Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 70. West southwest wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 60%.

    Low: 70 °F

    T-storms
    Likely


  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 82.

    High: 82 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday
    Night

    Thursday Night: A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Chance
    T-storms


  • Friday

    Friday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny



  • Friday
    Night

    Friday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy



    • Overnight: Mostly clear, with a low around 66. Calm wind becoming east around 5 mph.

    Tuesday: A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 88. Calm wind becoming south around 5 mph in the morning.

    Tuesday Night: A 10 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 70. South wind around 5 mph, with gusts as high as 10 mph.

    Wednesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Heat index values as high as 97. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Wednesday Night: Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 70. West southwest wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 60%.

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 82.

    Thursday Night: A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 63.

    Friday: Mostly sunny, with a high near 82.

    Friday Night: Partly cloudy, with a low around 67.

    Saturday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 85.

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 71.

    Sunday: A chance of showers and thunderstorms. Partly sunny, with a high near 86.

    Sunday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 65.

    Monday: A chance of showers and thunderstorms. Partly sunny, with a high near 87.


    Illinois Valley Rgnl-Walter A Duncan Field Airport IL
     41.34°N 89.14°W

    Visit your local NWS office at: https://www.weather.gov/lot