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.

Mostly Cloudy and Breezy

21°F

-6°C

Humidity 81%
Wind Speed NW 21 G 32 mph
Barometer 30.28 in (1026.2 mb)
Dewpoint 16°F (-9°C)
Visibility 9.00 mi
Wind Chill5°F (-15°C)
Last update 11 Jan 4:54 am CST
Extended Forecast for

3 Miles SW Harristown IL

  • Overnight

    Overnight: Isolated snow showers. Mostly cloudy, with a low around 23. Blustery, with a northwest wind around 23 mph, with gusts as high as 34 mph. Chance of precipitation is 20%.

    Low: 23 °F

    Isolated Snow
    Showers and
    Blustery

  • Sunday

    Sunday: Isolated flurries before 8am. Partly sunny, with a high near 35. Breezy, with a northwest wind 17 to 22 mph decreasing to 8 to 13 mph in the afternoon. Winds could gust as high as 33 mph.

    High: 35 °F

    Isolated
    Flurries and
    Breezy then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 26. Southwest wind 6 to 11 mph, with gusts as high as 21 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 54. West southwest wind 13 to 18 mph, with gusts as high as 25 mph.

    High: 54 °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: Mostly cloudy, with a high near 39. Breezy.

    High: 39 °F

    Mostly Cloudy
    and Breezy

  • Wednesday Night

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

    Low: 17 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Isolated snow showers. Mostly cloudy, with a low around 23. Blustery, with a northwest wind around 23 mph, with gusts as high as 34 mph. Chance of precipitation is 20%.
Sunday
Isolated flurries before 8am. Partly sunny, with a high near 35. Breezy, with a northwest wind 17 to 22 mph decreasing to 8 to 13 mph in the afternoon. Winds could gust as high as 33 mph.
Sunday Night
Mostly clear, with a low around 26. Southwest wind 6 to 11 mph, with gusts as high as 21 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 54. West southwest wind 13 to 18 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 34. West wind 10 to 13 mph, with gusts as high as 21 mph.
Wednesday
Mostly cloudy, with a high near 39. Breezy.
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 25.
Friday
Mostly cloudy, with a high near 36.
Friday Night
Mostly cloudy, with a low around 19.
Saturday
Partly sunny, with a high near 28.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Harristown IL
 39.8°N 89.12°W (Elev. 594 ft)
Last Update:
4:32 am CST Jan 11, 2026
Forecast Valid:
5am CST Jan 11, 2026-6pm CST Jan 17, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation