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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 39.84°N 88.97°W (Text-Only)
NWS Forecast for: Decatur IL
Issued by: National Weather Service Lincoln, IL
Last Update: 1:01 am CST Dec 5, 2025		Print

  • Overnight

    Overnight: Areas of freezing fog. Mostly clear, with a low around 0. Light south wind.

    Low: 0 °F

    Areas
    Freezing Fog

  • Friday

    Friday: Patchy freezing fog before 9am. Partly sunny, then gradually becoming sunny, with a high near 30. Wind chill values between -3 and 7. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 17 mph.

    High: 30 °F

    Patchy
    Freezing Fog
    then Sunny

  • Friday
    Night

    Friday Night: Increasing clouds, with a low around 24. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 17 mph.

    Low: 24 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, with a high near 32. West northwest wind around 6 mph becoming light and variable in the afternoon.

    High: 32 °F

    Mostly Cloudy


  • Saturday
    Night

    Saturday Night: Snow likely after midnight. Mostly cloudy, with a low around 23. East southeast wind 3 to 8 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 23 °F

    Mostly Cloudy
    then Snow
    Likely

  • Sunday

    Sunday: Snow likely before noon. Mostly cloudy, with a high near 32. East southeast wind 8 to 13 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%.

    High: 32 °F

    Snow Likely
    then Mostly
    Cloudy

  • Sunday
    Night

    Sunday Night: Mostly cloudy, with a low around 5. North wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 16 mph.

    Low: 5 °F

    Mostly Cloudy


  • Monday

    Monday: Mostly sunny, with a high near 24.

    High: 24 °F

    Mostly Sunny


  • Monday
    Night

    Monday Night: Mostly cloudy, with a low around 16.

    Low: 16 °F

    Mostly Cloudy




    • Overnight: Areas of freezing fog. Mostly clear, with a low around 0. Light south wind.

    Friday: Patchy freezing fog before 9am. Partly sunny, then gradually becoming sunny, with a high near 30. Wind chill values between -3 and 7. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 17 mph.

    Friday Night: Increasing clouds, with a low around 24. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 17 mph.

    Saturday: Mostly cloudy, with a high near 32. West northwest wind around 6 mph becoming light and variable in the afternoon.

    Saturday Night: Snow likely after midnight. Mostly cloudy, with a low around 23. East southeast wind 3 to 8 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Sunday: Snow likely before noon. Mostly cloudy, with a high near 32. East southeast wind 8 to 13 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%.

    Sunday Night: Mostly cloudy, with a low around 5. North wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 16 mph.

    Monday: Mostly sunny, with a high near 24.

    Monday Night: Mostly cloudy, with a low around 16.

    Tuesday: Partly sunny, with a high near 36.

    Tuesday Night: A chance of rain. Mostly cloudy, with a low around 30.

    Wednesday: A chance of rain. Mostly cloudy, with a high near 38.

    Wednesday Night: Mostly cloudy, with a low around 15.

    Thursday: Partly sunny, with a high near 27.


    Decatur IL
     39.84°N 88.97°W (Elev. 676 ft)

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