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.

Fair and Breezy

32°F

0°C

Humidity 73%
Wind Speed NE 23 G 31 mph
Barometer 30.15 in (1021.5 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 28 Feb 7:54 pm CST
Extended Forecast for

2 Miles ENE Harristown IL

  • Tonight

    Tonight: Partly cloudy, with a low around 25. North northeast wind 13 to 16 mph, with gusts as high as 26 mph.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 41. Northeast wind 10 to 14 mph, with gusts as high as 21 mph.

    High: 41 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 28. East northeast wind around 11 mph, with gusts as high as 18 mph.

    Low: 28 °F

    Chance Snow

  • Monday

    Monday: A chance of snow before 9am, then a chance of rain between 9am and noon. Mostly cloudy, with a high near 42. East southeast wind 9 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 42 °F

    Chance
    Rain/Snow
    then Cloudy

  • Monday Night

    Monday Night: Rain, mainly after midnight. Low around 37. Southeast wind around 10 mph, with gusts as high as 16 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 37 °F

    Chance Rain
    then Rain

  • Tuesday

    Tuesday: Rain. High near 56. South southeast wind 9 to 11 mph becoming east northeast in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 56 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 47. North northeast wind 9 to 11 mph becoming east southeast after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 47 °F

    Rain

  • Wednesday

    Wednesday: Rain likely and possibly a thunderstorm. Cloudy, with a high near 62. Chance of precipitation is 70%.

    High: 62 °F

    Rain Likely

  • Wednesday Night

    Wednesday Night: Rain likely. Mostly cloudy, with a low around 49. Chance of precipitation is 70%.

    Low: 49 °F

    Rain Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 25. North northeast wind 13 to 16 mph, with gusts as high as 26 mph.
Sunday
Partly sunny, with a high near 41. Northeast wind 10 to 14 mph, with gusts as high as 21 mph.
Sunday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 28. East northeast wind around 11 mph, with gusts as high as 18 mph.
Monday
A chance of snow before 9am, then a chance of rain between 9am and noon. Mostly cloudy, with a high near 42. East southeast wind 9 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Monday Night
Rain, mainly after midnight. Low around 37. Southeast wind around 10 mph, with gusts as high as 16 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
Rain. High near 56. South southeast wind 9 to 11 mph becoming east northeast in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night
Rain and possibly a thunderstorm. Low around 47. North northeast wind 9 to 11 mph becoming east southeast after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
Rain likely and possibly a thunderstorm. Cloudy, with a high near 62. Chance of precipitation is 70%.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 49. Chance of precipitation is 70%.
Thursday
Rain likely. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 52.
Friday
Rain likely. Mostly cloudy, with a high near 68.
Friday Night
Rain likely. Mostly cloudy, with a low around 51.
Saturday
Rain likely. Mostly cloudy, with a high near 62.
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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:
7:16 pm CST Feb 28, 2026
Forecast Valid:
8pm CST Feb 28, 2026-6pm CST Mar 7, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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