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

38°F

3°C

Humidity 51%
Wind Speed W 18 G 30 mph
Barometer 29.91 in (1013.3 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 20 Feb 3:54 pm CST
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: Increasing clouds, with a low around 24. West northwest wind 7 to 10 mph, with gusts as high as 22 mph.

    Low: 24 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly sunny, with a high near 38. West northwest wind 7 to 14 mph, with gusts as high as 18 mph.

    High: 38 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Scattered flurries after midnight. Partly cloudy, with a low around 20. Northwest wind 10 to 16 mph, with gusts as high as 23 mph.

    Low: 20 °F

    Scattered
    Flurries

  • Sunday

    Sunday: Partly sunny, with a high near 30. Wind chill values between 5 and 15. Blustery, with a northwest wind 17 to 20 mph, with gusts as high as 31 mph.

    High: 30 °F

    Partly Sunny
    and Blustery

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 16. Northwest wind around 17 mph, with gusts as high as 26 mph.

    Low: 16 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 31. North northwest wind 8 to 16 mph, with gusts as high as 24 mph.

    High: 31 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 18. Northwest wind around 6 mph becoming calm.

    Low: 18 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 45.

    High: 45 °F

    Partly Sunny

  • Tuesday Night

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

    Low: 34 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 24. West northwest wind 7 to 10 mph, with gusts as high as 22 mph.
Saturday
Mostly sunny, with a high near 38. West northwest wind 7 to 14 mph, with gusts as high as 18 mph.
Saturday Night
Scattered flurries after midnight. Partly cloudy, with a low around 20. Northwest wind 10 to 16 mph, with gusts as high as 23 mph.
Sunday
Partly sunny, with a high near 30. Wind chill values between 5 and 15. Blustery, with a northwest wind 17 to 20 mph, with gusts as high as 31 mph.
Sunday Night
Partly cloudy, with a low around 16. Northwest wind around 17 mph, with gusts as high as 26 mph.
Monday
Sunny, with a high near 31. North northwest wind 8 to 16 mph, with gusts as high as 24 mph.
Monday Night
Partly cloudy, with a low around 18. Northwest wind around 6 mph becoming calm.
Tuesday
Partly sunny, with a high near 45.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Partly sunny, with a high near 56.
Wednesday Night
Mostly cloudy, with a low around 29.
Thursday
Mostly sunny, with a high near 46.
Thursday Night
Mostly clear, with a low around 29.
Friday
Sunny, with a high near 56.
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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:
3:17 pm CST Feb 20, 2026
Forecast Valid:
4pm CST Feb 20, 2026-6pm CST Feb 27, 2026
 
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