7-Day Forecast 39.84°N 88.94°W (Text-Only)
NWS Forecast for: Decatur IL
Issued by: National Weather Service Lincoln, IL
Last Update: 12:26 pm CDT Jul 13, 2025
Print


  • This
    Afternoon

    This Afternoon: Showers likely and possibly a thunderstorm before 4pm, then a chance of showers and thunderstorms after 4pm.  Mostly cloudy, with a high near 85. Light and variable wind becoming southwest around 6 mph.  Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Showers
    Likely

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 9pm.  Patchy fog after 3am.  Otherwise, mostly cloudy, with a low around 69. Southeast wind around 6 mph becoming calm  in the evening.

    Low: 69 °F

    Chance
    Showers then
    Patchy Fog

  • Monday

    Monday: Patchy fog before 8am.  Otherwise, sunny, with a high near 87. Calm wind becoming east around 5 mph.

    High: 87 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday
    Night

    Monday Night: Partly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Partly Cloudy


  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 89. South wind 3 to 7 mph.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday
    Night

    Tuesday Night: Partly cloudy, with a low around 72. South wind 3 to 6 mph.

    Low: 72 °F

    Partly Cloudy


  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 90. Southwest wind 6 to 8 mph, with gusts as high as 15 mph.

    High: 90 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday
    Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms before 1am.  Partly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms after 1pm.  Partly sunny, with a high near 86.

    High: 86 °F

    Partly Sunny
    then Chance
    T-storms



  • This Afternoon: Showers likely and possibly a thunderstorm before 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 85. Light and variable wind becoming southwest around 6 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 9pm. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 69. Southeast wind around 6 mph becoming calm in the evening.

    Monday: Patchy fog before 8am. Otherwise, sunny, with a high near 87. Calm wind becoming east around 5 mph.

    Monday Night: Partly cloudy, with a low around 70. Calm wind.

    Tuesday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. South wind 3 to 7 mph.

    Tuesday Night: Partly cloudy, with a low around 72. South wind 3 to 6 mph.

    Wednesday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Southwest wind 6 to 8 mph, with gusts as high as 15 mph.

    Wednesday Night: A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 72.

    Thursday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86.

    Thursday Night: A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 67.

    Friday: A chance of showers. Mostly sunny, with a high near 84.

    Friday Night: Partly cloudy, with a low around 68.

    Saturday: A chance of showers. Mostly sunny, with a high near 87.



    Decatur IL
     39.84°N 88.94°W (Elev. 692 ft)

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