Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

92°F

33°C

Humidity 60%
Wind Speed S 12 mph
Barometer 30.01 in (1015.5 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index105°F (41°C)
Last update 18 Aug 3:54 pm CDT
Extended Forecast for

4 Miles NNE Shelbyville IL

Heat Advisory August 18, 04:43pm until August 18, 08:00pm
Click here for hazard details and duration
...
  •  
    Heat Advisory August 18, 04:43pm until August 18, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • Tonight

    Low: 71 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly between 1pm and 4pm.  Mostly sunny, with a high near 90. Heat index values as high as 101. South southwest wind around 8 mph becoming west northwest in the afternoon.

    High: 90 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly between 7pm and 1am.  Partly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Mostly sunny, with a high near 84. North northeast wind 5 to 8 mph.

    High: 84 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 64. North northeast wind around 6 mph.

    Low: 64 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 85. Northeast wind around 6 mph.

    High: 85 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 63. North northeast wind around 5 mph becoming calm  in the evening.

    Low: 63 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms after midnight. Partly cloudy, with a low around 71. South southeast wind 6 to 8 mph.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly between 1pm and 4pm. Mostly sunny, with a high near 90. Heat index values as high as 101. South southwest wind around 8 mph becoming west northwest in the afternoon.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly between 7pm and 1am. Partly cloudy, with a low around 70. Calm wind.
Wednesday
Mostly sunny, with a high near 84. North northeast wind 5 to 8 mph.
Wednesday Night
Partly cloudy, with a low around 64. North northeast wind around 6 mph.
Thursday
Mostly sunny, with a high near 85. Northeast wind around 6 mph.
Thursday Night
Mostly clear, with a low around 63. North northeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 85.
Friday Night
Mostly clear, with a low around 64.
Saturday
Sunny, with a high near 84.
Saturday Night
Mostly clear, with a low around 57.
Sunday
Sunny, with a high near 77.
Sunday Night
Mostly clear, with a low around 54.
Monday
Sunny, with a high near 77.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNE Shelbyville IL
 39.46°N 88.79°W (Elev. 653 ft)
4:25 pm CDT Aug 18, 2025
4pm CDT Aug 18, 2025-6pm CDT Aug 25, 2025
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database