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

20°F

-7°C

Humidity 96%
Wind Speed S 10 mph
Barometer 30.06 in (1019.0 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill9°F (-13°C)
Last update 3 Dec 4:54 am CST
Extended Forecast for

Decatur IL

  • Today

    Today: A 30 percent chance of snow, mainly after 5pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 33. South southwest wind 7 to 11 mph becoming west in the afternoon. Winds could gust as high as 21 mph.

    High: 33 °F

    Patchy Fog
    then Chance
    Snow

  • Tonight

    Tonight: A 20 percent chance of snow before 9pm. Mostly cloudy, with a low around 5. Wind chill values between -3 and 2. North wind 8 to 13 mph, with gusts as high as 21 mph.

    Low: 5 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 16. Wind chill values between -7 and 3. North wind 5 to 8 mph becoming calm in the afternoon.

    High: 16 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 0. Calm wind becoming south around 6 mph after midnight.

    Low: 0 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 29. South southwest wind 6 to 8 mph.

    High: 29 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 17. South southwest wind around 6 mph.

    Low: 17 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 30. West wind around 5 mph becoming light and variable in the afternoon.

    High: 30 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 20.

    Low: 20 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of snow after noon. Mostly cloudy, with a high near 29.

    High: 29 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Today
A 30 percent chance of snow, mainly after 5pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 33. South southwest wind 7 to 11 mph becoming west in the afternoon. Winds could gust as high as 21 mph.
Tonight
A 20 percent chance of snow before 9pm. Mostly cloudy, with a low around 5. Wind chill values between -3 and 2. North wind 8 to 13 mph, with gusts as high as 21 mph.
Thursday
Sunny, with a high near 16. Wind chill values between -7 and 3. North wind 5 to 8 mph becoming calm in the afternoon.
Thursday Night
Mostly clear, with a low around 0. Calm wind becoming south around 6 mph after midnight.
Friday
Mostly sunny, with a high near 29. South southwest wind 6 to 8 mph.
Friday Night
Mostly cloudy, with a low around 17. South southwest wind around 6 mph.
Saturday
Partly sunny, with a high near 30. West wind around 5 mph becoming light and variable in the afternoon.
Saturday Night
Mostly cloudy, with a low around 20.
Sunday
A 30 percent chance of snow after noon. Mostly cloudy, with a high near 29.
Sunday Night
Mostly cloudy, with a low around 17.
Monday
Partly sunny, with a high near 28.
Monday Night
Mostly cloudy, with a low around 21.
Tuesday
Partly sunny, with a high near 34.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
4:56 am CST Dec 3, 2025
Forecast Valid:
5am CST Dec 3, 2025-6pm CST Dec 9, 2025
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation