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.

Fog/Mist

26°F

-3°C

Humidity 92%
Wind Speed E 9 mph
Barometer 29.95 in (1015.0 mb)
Dewpoint 24°F (-4°C)
Visibility 5.00 mi
Wind Chill17°F (-8°C)
Last update 6 Dec 6:54 pm CST
Extended Forecast for

2 Miles ENE Harristown IL

Winter Weather Advisory December 6, 09:00pm until December 7, 06:00am
Click here for hazard details and duration
Winter Weather Advisory

  • Tonight

    Tonight: A slight chance of freezing rain between 11pm and 3am, then a chance of rain. Patchy fog after 1am. Otherwise, cloudy, with a low around 28. Southeast wind 6 to 8 mph. Chance of precipitation is 50%.

    Low: 28 °F

    Chance
    Rain/Freezing
    Rain and
    Patchy Fog

  • Sunday

    Sunday: A chance of rain and snow before 8am, then a chance of rain between 8am and noon. Patchy fog before 11am. Otherwise, cloudy, with a temperature rising to near 33 by 9am, then falling to around 25 during the remainder of the day. South wind 6 to 15 mph becoming north in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 30%.

    High: 33 °F⇓

    Chance
    Rain/Snow and
    Patchy Fog
    then Mostly
    Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 13. Wind chill values between 4 and 9. North northeast wind 5 to 13 mph, with gusts as high as 17 mph.

    Low: 13 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 26. North northeast wind around 6 mph becoming south in the afternoon.

    High: 26 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a temperature falling to near 18 by 8pm, then rising to around 26 during the remainder of the night. South wind 6 to 16 mph, with gusts as high as 23 mph.

    Low: 18 °F⇑

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 42. South southwest wind 14 to 16 mph, with gusts as high as 23 mph.

    High: 42 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 34. Breezy, with a southwest wind 15 to 21 mph, with gusts as high as 28 mph.

    Low: 34 °F

    Breezy.
    Mostly Cloudy
    then Chance
    Rain

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 41. Breezy.

    High: 41 °F

    Mostly Cloudy
    and Breezy
    then Mostly
    Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 22.

    Low: 22 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Tonight
A slight chance of freezing rain between 11pm and 3am, then a chance of rain. Patchy fog after 1am. Otherwise, cloudy, with a low around 28. Southeast wind 6 to 8 mph. Chance of precipitation is 50%.
Sunday
A chance of rain and snow before 8am, then a chance of rain between 8am and noon. Patchy fog before 11am. Otherwise, cloudy, with a temperature rising to near 33 by 9am, then falling to around 25 during the remainder of the day. South wind 6 to 15 mph becoming north in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 30%.
Sunday Night
Mostly cloudy, with a low around 13. Wind chill values between 4 and 9. North northeast wind 5 to 13 mph, with gusts as high as 17 mph.
Monday
Mostly sunny, with a high near 26. North northeast wind around 6 mph becoming south in the afternoon.
Monday Night
Mostly cloudy, with a temperature falling to near 18 by 8pm, then rising to around 26 during the remainder of the night. South wind 6 to 16 mph, with gusts as high as 23 mph.
Tuesday
Partly sunny, with a high near 42. South southwest wind 14 to 16 mph, with gusts as high as 23 mph.
Tuesday Night
A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 34. Breezy, with a southwest wind 15 to 21 mph, with gusts as high as 28 mph.
Wednesday
Mostly cloudy, with a high near 41. Breezy.
Wednesday Night
A 30 percent chance of snow after midnight. Mostly cloudy, with a low around 22.
Thursday
A 30 percent chance of snow before noon. Mostly cloudy, with a high near 31.
Thursday Night
Mostly cloudy, with a low around 13.
Friday
Partly sunny, with a high near 20.
Friday Night
Mostly cloudy, with a low around 1.
Saturday
Mostly sunny, with a high near 15.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Harristown IL
 39.84°N 89.03°W (Elev. 666 ft)
Last Update:
6:36 pm CST Dec 6, 2025
Forecast Valid:
7pm CST Dec 6, 2025-6pm CST Dec 13, 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