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.

Fair

7°F

-14°C

Humidity 80%
Wind Speed SW 7 mph
Barometer 30.36 in (1029.6 mb)
Dewpoint 2°F (-17°C)
Visibility 10.00 mi
Wind Chill-5°F (-21°C)
Last update 1 Feb 8:54 am CST
Extended Forecast for

2 Miles ENE Harristown IL

  • Today

    Today: A 40 percent chance of snow, mainly after 5pm. Increasing clouds, with a high near 23. Wind chill values between -2 and 8. South southwest wind 5 to 10 mph, with gusts as high as 16 mph.

    High: 23 °F

    Partly Sunny
    then Chance
    Snow

  • Tonight

    Tonight: Snow likely, mainly before 9pm. Mostly cloudy, with a low around 16. South wind 6 to 9 mph, with gusts as high as 15 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 16 °F

    Snow Likely
    then Mostly
    Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 31. West wind 5 to 9 mph.

    High: 31 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 20. Calm wind becoming northeast around 5 mph after midnight.

    Low: 20 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 29. Northeast wind 6 to 8 mph.

    High: 29 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 10. North wind around 6 mph.

    Low: 10 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 24. North wind around 6 mph.

    High: 24 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 8.

    Low: 8 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 33.

    High: 33 °F

    Partly Sunny

Detailed Forecast

Today
A 40 percent chance of snow, mainly after 5pm. Increasing clouds, with a high near 23. Wind chill values between -2 and 8. South southwest wind 5 to 10 mph, with gusts as high as 16 mph.
Tonight
Snow likely, mainly before 9pm. Mostly cloudy, with a low around 16. South wind 6 to 9 mph, with gusts as high as 15 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Monday
Mostly cloudy, with a high near 31. West wind 5 to 9 mph.
Monday Night
Mostly cloudy, with a low around 20. Calm wind becoming northeast around 5 mph after midnight.
Tuesday
Mostly cloudy, with a high near 29. Northeast wind 6 to 8 mph.
Tuesday Night
Mostly cloudy, with a low around 10. North wind around 6 mph.
Wednesday
Mostly sunny, with a high near 24. North wind around 6 mph.
Wednesday Night
Partly cloudy, with a low around 8.
Thursday
Partly sunny, with a high near 33.
Thursday Night
Mostly cloudy, with a low around 26.
Friday
Partly sunny, with a high near 38.
Friday Night
Mostly cloudy, with a low around 14.
Saturday
Mostly sunny, with a high near 25.
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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:
9:37 am CST Feb 1, 2026
Forecast Valid:
9am CST Feb 1, 2026-6pm CST Feb 7, 2026
 
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