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.

Mostly Cloudy

18°F

-8°C

Humidity 81%
Wind Speed N 13 mph
Barometer 30.31 in (1027.2 mb)
Dewpoint 13°F (-11°C)
Visibility 10.00 mi
Wind Chill5°F (-15°C)
Last update 7 Dec 11:54 pm CST
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: Partly cloudy, with a low around 14. Wind chill values between 4 and 9. North northeast wind 7 to 9 mph, with gusts as high as 16 mph.

    Low: 14 °F

    Partly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 27. Wind chill values between 5 and 15. North northeast wind around 6 mph becoming calm in the morning.

    High: 27 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 19. Light south wind becoming south southwest 9 to 14 mph in the evening. Winds could gust as high as 22 mph.

    Low: 19 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 43. Southwest wind 11 to 14 mph, with gusts as high as 22 mph.

    High: 43 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 35. Breezy, with a south wind 14 to 21 mph becoming west after midnight. Winds could gust as high as 32 mph.

    Low: 35 °F

    Mostly Cloudy
    then Chance
    Rain and
    Breezy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 41. Breezy, with a west northwest wind 13 to 21 mph, with gusts as high as 33 mph.

    High: 41 °F

    Mostly Cloudy
    and Breezy
    then Mostly
    Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 23. West northwest wind 6 to 10 mph, with gusts as high as 16 mph.

    Low: 23 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 50 percent chance of snow. Mostly cloudy, with a high near 30.

    High: 30 °F

    Chance Snow

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 13.

    Low: 13 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 14. Wind chill values between 4 and 9. North northeast wind 7 to 9 mph, with gusts as high as 16 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 27. Wind chill values between 5 and 15. North northeast wind around 6 mph becoming calm in the morning.
Monday Night
Mostly cloudy, with a low around 19. Light south wind becoming south southwest 9 to 14 mph in the evening. Winds could gust as high as 22 mph.
Tuesday
Partly sunny, with a high near 43. Southwest wind 11 to 14 mph, with gusts as high as 22 mph.
Tuesday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 35. Breezy, with a south wind 14 to 21 mph becoming west after midnight. Winds could gust as high as 32 mph.
Wednesday
Mostly cloudy, with a high near 41. Breezy, with a west northwest wind 13 to 21 mph, with gusts as high as 33 mph.
Wednesday Night
Mostly cloudy, with a low around 23. West northwest wind 6 to 10 mph, with gusts as high as 16 mph.
Thursday
A 50 percent chance of snow. Mostly cloudy, with a high near 30.
Thursday Night
Mostly cloudy, with a low around 13.
Friday
Partly sunny, with a high near 21.
Friday Night
Mostly cloudy, with a low around 2.
Saturday
Partly sunny, with a high near 13.
Saturday Night
Mostly cloudy, with a low around 1.
Sunday
Mostly sunny, with a high near 18.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
11:27 pm CST Dec 7, 2025
Forecast Valid:
12am CST Dec 8, 2025-6pm CST Dec 14, 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