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

47°F

8°C

Humidity 59%
Wind Speed W 6 mph
Barometer 30.26 in (1024.8 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 5 Apr 11:54 pm CDT
Extended Forecast for

2 Miles ENE Harristown IL

  • Overnight

    Overnight: Clear, with a low around 39. West southwest wind 8 to 10 mph, with gusts as high as 17 mph.

    Low: 39 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 55. Northwest wind 10 to 14 mph, with gusts as high as 21 mph.

    High: 55 °F

    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 32. Northwest wind around 11 mph becoming north northeast after midnight. Winds could gust as high as 18 mph.

    Low: 32 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 47. East wind around 10 mph, with gusts as high as 17 mph.

    High: 47 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38. East southeast wind 9 to 13 mph, with gusts as high as 20 mph.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 69. Breezy, with a south southeast wind 14 to 20 mph, with gusts as high as 29 mph.

    High: 69 °F

    Partly Sunny
    then Mostly
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 53. South wind around 17 mph, with gusts as high as 25 mph.

    Low: 53 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers after 1pm. Partly sunny, with a high near 71.

    High: 71 °F

    Partly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 54.

    Low: 54 °F

    Chance
    Showers

Detailed Forecast

Overnight
Clear, with a low around 39. West southwest wind 8 to 10 mph, with gusts as high as 17 mph.
Monday
Sunny, with a high near 55. Northwest wind 10 to 14 mph, with gusts as high as 21 mph.
Monday Night
Mostly cloudy, with a low around 32. Northwest wind around 11 mph becoming north northeast after midnight. Winds could gust as high as 18 mph.
Tuesday
Partly sunny, with a high near 47. East wind around 10 mph, with gusts as high as 17 mph.
Tuesday Night
Mostly cloudy, with a low around 38. East southeast wind 9 to 13 mph, with gusts as high as 20 mph.
Wednesday
Partly sunny, with a high near 69. Breezy, with a south southeast wind 14 to 20 mph, with gusts as high as 29 mph.
Wednesday Night
Partly cloudy, with a low around 53. South wind around 17 mph, with gusts as high as 25 mph.
Thursday
A 30 percent chance of showers after 1pm. Partly sunny, with a high near 71.
Thursday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 54.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 70. Chance of precipitation is 40%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 51.
Saturday
A chance of showers. Partly sunny, with a high near 74.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 58.
Sunday
A chance of showers. Mostly cloudy, with a high near 79.
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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:
11:36 pm CDT Apr 5, 2026
Forecast Valid:
12am CDT Apr 6, 2026-6pm CDT Apr 12, 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