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.

Partly Cloudy and Breezy

6°F

-14°C

Humidity 54%
Wind Speed NW 21 G 36 mph
Barometer 30.34 in (1028.6 mb)
Dewpoint -7°F (-22°C)
Visibility 10.00 mi
Wind Chill-15°F (-26°C)
Last update 19 Jan 9:54 am CST
Extended Forecast for

2 Miles ENE Harristown IL

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

    NOW until 12:00pm Mon

    Cold Weather Advisory

  • M.L.King Day

    High: 14 °F

    Sunny and
    Blustery

  • Tonight

    Tonight: Partly cloudy, with a low around 7. Wind chill values between -3 and 2. Southwest wind 5 to 9 mph, with gusts as high as 17 mph.

    Low: 7 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 30. Wind chill values between -2 and 8. South southwest wind 6 to 10 mph, with gusts as high as 16 mph.

    High: 30 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a temperature rising to around 32 by 4am. South wind 9 to 18 mph, with gusts as high as 28 mph.

    Low: 26 °F⇑

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 38. West wind 10 to 18 mph, with gusts as high as 28 mph.

    High: 38 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 19. West northwest wind 9 to 14 mph, with gusts as high as 21 mph.

    Low: 19 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 30. West northwest wind 7 to 13 mph, with gusts as high as 18 mph.

    High: 30 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 11.

    Low: 11 °F

    Mostly Cloudy

Detailed Forecast

M.L.King Day
Sunny, with a high near 14. Wind chill values between -3 and -13. Blustery, with a west northwest wind 13 to 23 mph, with gusts as high as 33 mph.
Tonight
Partly cloudy, with a low around 7. Wind chill values between -3 and 2. Southwest wind 5 to 9 mph, with gusts as high as 17 mph.
Tuesday
Mostly sunny, with a high near 30. Wind chill values between -2 and 8. South southwest wind 6 to 10 mph, with gusts as high as 16 mph.
Tuesday Night
Mostly cloudy, with a temperature rising to around 32 by 4am. South wind 9 to 18 mph, with gusts as high as 28 mph.
Wednesday
Mostly sunny, with a high near 38. West wind 10 to 18 mph, with gusts as high as 28 mph.
Wednesday Night
Partly cloudy, with a low around 19. West northwest wind 9 to 14 mph, with gusts as high as 21 mph.
Thursday
Mostly sunny, with a high near 30. West northwest wind 7 to 13 mph, with gusts as high as 18 mph.
Thursday Night
Mostly cloudy, with a low around 11.
Friday
Mostly cloudy, with a high near 18.
Friday Night
Mostly cloudy, with a low around -3.
Saturday
Partly sunny, with a high near 11.
Saturday Night
A chance of snow. Mostly cloudy, with a low around 3.
Sunday
Mostly sunny, with a high near 20.
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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:
9:56 am CST Jan 19, 2026
Forecast Valid:
10am CST Jan 19, 2026-6pm CST Jan 25, 2026
 
Forecast Discussion
 
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Additional Resources

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