National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

57°F

14°C

Humidity 90%
Wind Speed NE 5 mph
Barometer 30.19 in (1021.9 mb)
Dewpoint 54°F (12°C)
Visibility 9.00 mi
Last update 3 Aug 6:54 am CDT
Extended Forecast for

Decatur IL

  • Today

    Today: Sunny, with a high near 80. East northeast wind 6 to 9 mph.

    High: 80 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 61. East northeast wind around 7 mph.

    Low: 61 °F

    Partly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. East wind around 7 mph.

    High: 82 °F

    Partly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A chance of thunderstorms before 7pm. Mostly cloudy, with a low around 65. East wind around 6 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83. East southeast wind 3 to 6 mph.

    High: 83 °F

    Partly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66. East southeast wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 86. Light south southeast wind.

    High: 86 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 80. East northeast wind 6 to 9 mph.
Tonight
Partly cloudy, with a low around 61. East northeast wind around 7 mph.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. East wind around 7 mph.
Monday Night
A chance of thunderstorms before 7pm. Mostly cloudy, with a low around 65. East wind around 6 mph becoming calm in the evening. Chance of precipitation is 30%.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83. East southeast wind 3 to 6 mph.
Tuesday Night
Mostly clear, with a low around 66. East southeast wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 86. Light south southeast wind.
Wednesday Night
Mostly clear, with a low around 67.
Thursday
Sunny, with a high near 87.
Thursday Night
Mostly clear, with a low around 69.
Friday
Sunny, with a high near 88.
Friday Night
Mostly clear, with a low around 71.
Saturday
Sunny, with a high near 90.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.86°N 88.94°W (Elev. 682 ft)
Last Update:
6:40 am CDT Aug 3, 2025
Forecast Valid:
6am CDT Aug 3, 2025-6pm CDT Aug 9, 2025
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation