National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

A Few Clouds

31°F

-1°C

Humidity 54%
Wind Speed W 7 mph
Barometer 30.43 in (1031.3 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 28 Nov 12:54 pm CST
Extended Forecast for

Decatur IL

Winter Storm Warning November 29, 12:00am until November 30, 06:00am
Click here for hazard details and duration
Winter Storm Warning

  • This Afternoon

    This Afternoon: Sunny, with a high near 34. West northwest wind 5 to 7 mph becoming calm.

    High: 34 °F

    Sunny

  • Tonight

    Tonight: Snow, mainly after 4am. Low around 24. Light southeast wind increasing to 8 to 13 mph in the evening. Winds could gust as high as 21 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    Low: 24 °F

    Mostly Cloudy
    then Snow

  • Saturday

    Saturday: Snow before 3pm, then snow, possibly mixed with sleet between 3pm and 4pm, then snow after 4pm. The snow could be heavy at times. High near 34. Breezy, with a south southeast wind 14 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New snow and sleet accumulation of 4 to 8 inches possible.

    High: 34 °F

    Snow then
    Snow/Sleet
    and Breezy

  • Saturday Night

    Saturday Night: Rain and snow before 3am, then a chance of snow. Low around 23. Breezy, with a south wind 15 to 20 mph becoming west northwest after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.

    Low: 23 °F

    Breezy.
    Rain/Snow
    then Chance
    Rain/Snow

  • Sunday

    Sunday: Mostly cloudy, with a high near 28. Blustery, with a west northwest wind 11 to 20 mph, with gusts as high as 25 mph.

    High: 28 °F

    Mostly Cloudy
    and Blustery
    then Mostly
    Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 11. West northwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 15 mph.

    Low: 11 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 23. Light and variable wind.

    High: 23 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A 40 percent chance of snow before midnight. Mostly cloudy, with a low around 13.

    Low: 13 °F

    Chance Snow
    then Mostly
    Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 25.

    High: 25 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 34. West northwest wind 5 to 7 mph becoming calm.
Tonight
Snow, mainly after 4am. Low around 24. Light southeast wind increasing to 8 to 13 mph in the evening. Winds could gust as high as 21 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Saturday
Snow before 3pm, then snow, possibly mixed with sleet between 3pm and 4pm, then snow after 4pm. The snow could be heavy at times. High near 34. Breezy, with a south southeast wind 14 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New snow and sleet accumulation of 4 to 8 inches possible.
Saturday Night
Rain and snow before 3am, then a chance of snow. Low around 23. Breezy, with a south wind 15 to 20 mph becoming west northwest after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.
Sunday
Mostly cloudy, with a high near 28. Blustery, with a west northwest wind 11 to 20 mph, with gusts as high as 25 mph.
Sunday Night
Mostly cloudy, with a low around 11. West northwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 15 mph.
Monday
Mostly cloudy, with a high near 23. Light and variable wind.
Monday Night
A 40 percent chance of snow before midnight. Mostly cloudy, with a low around 13.
Tuesday
Partly sunny, with a high near 25.
Tuesday Night
Mostly cloudy, with a low around 15.
Wednesday
Partly sunny, with a high near 33.
Wednesday Night
Mostly cloudy, with a low around 17.
Thursday
Partly sunny, with a high near 26.
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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:
12:26 pm CST Nov 28, 2025
Forecast Valid:
1pm CST Nov 28, 2025-6pm CST Dec 4, 2025
 
Forecast Discussion
 
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Additional Resources

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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