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

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Overcast

27°F

-3°C

Humidity 72%
Wind Speed NW 17 G 24 mph
Barometer 30.47 in (1032.7 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill14°F (-10°C)
Last update 11 Jan 10:54 am CST
Extended Forecast for

2 Miles ENE Harristown IL

  • Today

    Today: Mostly sunny, with a high near 35. West northwest wind 8 to 16 mph, with gusts as high as 24 mph.

    High: 35 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 26. Southwest wind 6 to 13 mph, with gusts as high as 22 mph.

    Low: 26 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 44. West southwest wind 8 to 13 mph, with gusts as high as 22 mph.

    High: 44 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 33. Southwest wind 7 to 11 mph, with gusts as high as 18 mph.

    Low: 33 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 53. West southwest wind 13 to 17 mph, with gusts as high as 26 mph.

    High: 53 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 34. West wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of rain and snow after noon. Mostly cloudy, with a high near 39. Breezy, with a north northwest wind 14 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.

    High: 39 °F

    Mostly Cloudy
    then Chance
    Rain/Snow and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 17.

    Low: 17 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 35. West northwest wind 8 to 16 mph, with gusts as high as 24 mph.
Tonight
Mostly clear, with a low around 26. Southwest wind 6 to 13 mph, with gusts as high as 22 mph.
Monday
Mostly sunny, with a high near 44. West southwest wind 8 to 13 mph, with gusts as high as 22 mph.
Monday Night
Partly cloudy, with a low around 33. Southwest wind 7 to 11 mph, with gusts as high as 18 mph.
Tuesday
Partly sunny, with a high near 53. West southwest wind 13 to 17 mph, with gusts as high as 26 mph.
Tuesday Night
Mostly cloudy, with a low around 34. West wind 10 to 13 mph, with gusts as high as 21 mph.
Wednesday
A chance of rain and snow after noon. Mostly cloudy, with a high near 39. Breezy, with a north northwest wind 14 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.
Wednesday Night
Mostly cloudy, with a low around 17.
Thursday
Mostly sunny, with a high near 32.
Thursday Night
Mostly cloudy, with a low around 24.
Friday
Mostly cloudy, with a high near 36.
Friday Night
Mostly cloudy, with a low around 19.
Saturday
Partly sunny, with a high near 27.
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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:
10:27 am CST Jan 11, 2026
Forecast Valid:
11am CST Jan 11, 2026-6pm CST Jan 17, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation