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.

Partly Cloudy

81°F

27°C

Humidity 77%
Wind Speed NE 13 mph
Barometer 29.81 in (1008.5 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 28 Jul 9:54 am CDT
Extended Forecast for

Decatur Airport IL

  • Today

    Today: Partly sunny, with a high near 86. North wind around 11 mph, with gusts as high as 16 mph.

    High: 86 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 60. North northeast wind 6 to 9 mph.

    Low: 60 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 83. North northeast wind 6 to 9 mph.

    High: 83 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 61. North northeast wind 5 to 7 mph becoming calm in the evening.

    Low: 61 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 85. Light and variable wind.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 65. Light and variable wind.

    Low: 65 °F

    Partly Cloudy

  • Friday

    Friday: A 50 percent chance of showers. Mostly cloudy, with a high near 82. South wind 5 to 8 mph.

    High: 82 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

  • Saturday

    Saturday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 79. Chance of precipitation is 60%.

    High: 79 °F

    Showers
    Likely

Detailed Forecast

Today
Partly sunny, with a high near 86. North wind around 11 mph, with gusts as high as 16 mph.
Tonight
Mostly clear, with a low around 60. North northeast wind 6 to 9 mph.
Wednesday
Sunny, with a high near 83. North northeast wind 6 to 9 mph.
Wednesday Night
Clear, with a low around 61. North northeast wind 5 to 7 mph becoming calm in the evening.
Thursday
Sunny, with a high near 85. Light and variable wind.
Thursday Night
Partly cloudy, with a low around 65. Light and variable wind.
Friday
A 50 percent chance of showers. Mostly cloudy, with a high near 82. South wind 5 to 8 mph.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Saturday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 79. Chance of precipitation is 60%.
Saturday Night
Partly cloudy, with a low around 64.
Sunday
Mostly sunny, with a high near 81.
Sunday Night
Mostly clear, with a low around 64.
Monday
Sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur Airport IL
 39.84°N 88.85°W (Elev. 686 ft)
Last Update:
10:36 am CDT Jul 28, 2026
Forecast Valid:
10am CDT Jul 28, 2026-6pm CDT Aug 3, 2026
 
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