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.

Fog/Mist

39°F

4°C

Humidity 96%
Wind Speed N 3 mph
Barometer 30.12 in (1020.1 mb)
Dewpoint 38°F (3°C)
Visibility 3.00 mi
Last update 22 Nov 7:54 am CST
Extended Forecast for

Decatur Airport IL

  • Today

    Today: Sunny, with a high near 54. North northeast wind around 6 mph becoming light and variable.

    High: 54 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 36. Southwest wind 6 to 9 mph becoming west northwest after midnight. Winds could gust as high as 17 mph.

    Low: 36 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 57. West northwest wind around 6 mph becoming calm in the afternoon.

    High: 57 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 35. Calm wind becoming southeast 5 to 7 mph after midnight.

    Low: 35 °F

    Increasing
    Clouds

  • Monday

    Monday: A 40 percent chance of rain after noon. Mostly cloudy, with a high near 56. South southeast wind 8 to 13 mph, with gusts as high as 18 mph.

    High: 56 °F

    Mostly Cloudy
    then Chance
    Rain

  • Monday Night

    Monday Night: Rain. Low around 47. South southeast wind 9 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 47 °F

    Rain then
    Rain Likely

  • Tuesday

    Tuesday: A 30 percent chance of rain. Mostly cloudy, with a high near 61. South southwest wind 9 to 13 mph becoming west northwest in the afternoon. Winds could gust as high as 18 mph.

    High: 61 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 34.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 45.

    High: 45 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 54. North northeast wind around 6 mph becoming light and variable.
Tonight
Mostly clear, with a low around 36. Southwest wind 6 to 9 mph becoming west northwest after midnight. Winds could gust as high as 17 mph.
Sunday
Sunny, with a high near 57. West northwest wind around 6 mph becoming calm in the afternoon.
Sunday Night
Increasing clouds, with a low around 35. Calm wind becoming southeast 5 to 7 mph after midnight.
Monday
A 40 percent chance of rain after noon. Mostly cloudy, with a high near 56. South southeast wind 8 to 13 mph, with gusts as high as 18 mph.
Monday Night
Rain. Low around 47. South southeast wind 9 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
A 30 percent chance of rain. Mostly cloudy, with a high near 61. South southwest wind 9 to 13 mph becoming west northwest in the afternoon. Winds could gust as high as 18 mph.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Partly sunny, with a high near 45.
Wednesday Night
Partly cloudy, with a low around 25.
Thanksgiving Day
Mostly sunny, with a high near 42.
Thursday Night
Partly cloudy, with a low around 23.
Friday
Mostly sunny, with a high near 41.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur Airport IL
 39.84°N 88.88°W (Elev. 650 ft)
Last Update:
3:16 am CST Nov 22, 2025
Forecast Valid:
7am CST Nov 22, 2025-6pm CST Nov 28, 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