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Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Overcast

14°F

-10°C

Humidity 71%
Wind Speed W 15 mph
Barometer 30.14 in (1021.9 mb)
Dewpoint 6°F (-14°C)
Visibility 10.00 mi
Wind Chill-1°F (-18°C)
Last update 18 Jan 8:54 am CST
Extended Forecast for

2 Miles ENE Harristown IL

Cold Weather Advisory January 19, 03:00am until January 19, 12:00pm
Click here for hazard details and duration
Cold Weather Advisory

  • Today

    Today: A chance of flurries between 2pm and 5pm, then a slight chance of snow after 5pm. Cloudy, with a high near 24. Wind chill values between zero and 10. South southwest wind 11 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

    High: 24 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Tonight

    Tonight: A slight chance of snow before 9pm, then a chance of flurries between 9pm and midnight. Cloudy, then gradually becoming partly cloudy, with a low around 4. Wind chill values between -3 and -13. Blustery, with a southwest wind 13 to 23 mph becoming west northwest in the evening. Winds could gust as high as 37 mph. Chance of precipitation is 20%.

    Low: 4 °F

    Blustery.
    Slight Chance
    Snow then
    Mostly Cloudy

  • M.L.King Day

    M.L.King Day: Sunny, with a high near 14. Wind chill values between -6 and -16. Blustery, with a west northwest wind 19 to 24 mph decreasing to 13 to 18 mph in the afternoon. Winds could gust as high as 34 mph.

    High: 14 °F

    Sunny and
    Blustery

  • Monday Night

    Monday Night: Partly cloudy, with a low around 7. Wind chill values between -3 and 2. Southwest wind 6 to 10 mph, with gusts as high as 15 mph.

    Low: 7 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 29. South southwest wind 9 to 14 mph, with gusts as high as 20 mph.

    High: 29 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 23. South wind 10 to 17 mph, with gusts as high as 24 mph.

    Low: 23 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 37. West wind 10 to 16 mph, with gusts as high as 23 mph.

    High: 37 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 18.

    Low: 18 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 29.

    High: 29 °F

    Mostly Sunny

Detailed Forecast

Today
A chance of flurries between 2pm and 5pm, then a slight chance of snow after 5pm. Cloudy, with a high near 24. Wind chill values between zero and 10. South southwest wind 11 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.
Tonight
A slight chance of snow before 9pm, then a chance of flurries between 9pm and midnight. Cloudy, then gradually becoming partly cloudy, with a low around 4. Wind chill values between -3 and -13. Blustery, with a southwest wind 13 to 23 mph becoming west northwest in the evening. Winds could gust as high as 37 mph. Chance of precipitation is 20%.
M.L.King Day
Sunny, with a high near 14. Wind chill values between -6 and -16. Blustery, with a west northwest wind 19 to 24 mph decreasing to 13 to 18 mph in the afternoon. Winds could gust as high as 34 mph.
Monday Night
Partly cloudy, with a low around 7. Wind chill values between -3 and 2. Southwest wind 6 to 10 mph, with gusts as high as 15 mph.
Tuesday
Mostly sunny, with a high near 29. South southwest wind 9 to 14 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly cloudy, with a low around 23. South wind 10 to 17 mph, with gusts as high as 24 mph.
Wednesday
Mostly sunny, with a high near 37. West wind 10 to 16 mph, with gusts as high as 23 mph.
Wednesday Night
Partly cloudy, with a low around 18.
Thursday
Mostly sunny, with a high near 29.
Thursday Night
Mostly cloudy, with a low around 21.
Friday
A chance of rain. Mostly cloudy, with a high near 37.
Friday Night
A chance of snow. Mostly cloudy, with a low around 17.
Saturday
A chance of snow. Partly sunny, with a high near 24.
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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:
9:36 am CST Jan 18, 2026
Forecast Valid:
9am CST Jan 18, 2026-6pm CST Jan 24, 2026
 
Forecast Discussion
 
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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