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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: 11:21 pm CDT Jun 29, 2026		Print

  • Tonight

    Tonight: Mostly clear, with a low around 76. South southwest wind 8 to 10 mph, with gusts as high as 18 mph.

    Low: 76 °F

    Mostly Clear


  • Tuesday

    Tuesday: Mostly sunny, with a high near 94. Heat index values as high as 106. South southwest wind 8 to 14 mph, with gusts as high as 21 mph.

    High: 94 °F

    Mostly Sunny


  • Tuesday
    Night

    Tuesday Night: Clear, with a low around 75. South southwest wind 8 to 11 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Clear


  • Wednesday

    Wednesday: Sunny, with a high near 94. Heat index values as high as 105. South southwest wind 6 to 10 mph, with gusts as high as 17 mph.

    High: 94 °F

    Sunny


  • Wednesday
    Night

    Wednesday Night: Clear, with a low around 75. South wind 7 to 10 mph, with gusts as high as 16 mph.

    Low: 75 °F

    Clear


  • Thursday

    Thursday: Sunny, with a high near 93. South southwest wind 7 to 9 mph, with gusts as high as 15 mph.

    High: 93 °F

    Sunny


  • Thursday
    Night

    Thursday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75. South southwest wind 5 to 7 mph.

    Low: 75 °F

    Partly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.

    High: 92 °F

    Chance
    T-storms

  • Friday
    Night

    Friday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy




    • Tonight: Mostly clear, with a low around 76. South southwest wind 8 to 10 mph, with gusts as high as 18 mph.

    Tuesday: Mostly sunny, with a high near 94. Heat index values as high as 106. South southwest wind 8 to 14 mph, with gusts as high as 21 mph.

    Tuesday Night: Clear, with a low around 75. South southwest wind 8 to 11 mph, with gusts as high as 20 mph.

    Wednesday: Sunny, with a high near 94. Heat index values as high as 105. South southwest wind 6 to 10 mph, with gusts as high as 17 mph.

    Wednesday Night: Clear, with a low around 75. South wind 7 to 10 mph, with gusts as high as 16 mph.

    Thursday: Sunny, with a high near 93. South southwest wind 7 to 9 mph, with gusts as high as 15 mph.

    Thursday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75. South southwest wind 5 to 7 mph.

    Friday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.

    Friday Night: Partly cloudy, with a low around 73.

    Independence Day: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92.

    Saturday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 72.

    Sunday: A chance of showers and thunderstorms. Mostly sunny, with a high near 90.

    Sunday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 70.

    Monday: Mostly sunny, with a high near 86.


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

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