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 86%
Wind Speed SW 8 mph
Barometer 30.05 in (1017.6 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 10 Nov 2:54 am CST
Extended Forecast for

3 Miles ENE Harristown IL

  • Overnight

    Overnight: Clear, with a low around 46. West southwest wind around 7 mph, with gusts as high as 15 mph.

    Low: 46 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 68. West wind around 6 mph becoming north in the afternoon.

    High: 68 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 42. Light and variable wind.

    Low: 42 °F

    Increasing
    Clouds

  • Veterans Day

    Veterans Day: Mostly sunny, with a high near 65. Light and variable wind becoming west northwest 9 to 14 mph in the morning. Winds could gust as high as 23 mph.

    High: 65 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 38. North northwest wind 13 to 16 mph, with gusts as high as 23 mph.

    Low: 38 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 47. North northwest wind 14 to 17 mph, with gusts as high as 22 mph.

    High: 47 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 29. North northwest wind 9 to 14 mph, with gusts as high as 18 mph.

    Low: 29 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 43.

    High: 43 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 23.

    Low: 23 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 46. West southwest wind around 7 mph, with gusts as high as 15 mph.
Tuesday
Sunny, with a high near 68. West wind around 6 mph becoming north in the afternoon.
Tuesday Night
Increasing clouds, with a low around 42. Light and variable wind.
Veterans Day
Mostly sunny, with a high near 65. Light and variable wind becoming west northwest 9 to 14 mph in the morning. Winds could gust as high as 23 mph.
Wednesday Night
Mostly cloudy, with a low around 38. North northwest wind 13 to 16 mph, with gusts as high as 23 mph.
Thursday
Partly sunny, with a high near 47. North northwest wind 14 to 17 mph, with gusts as high as 22 mph.
Thursday Night
Partly cloudy, with a low around 29. North northwest wind 9 to 14 mph, with gusts as high as 18 mph.
Friday
Sunny, with a high near 43.
Friday Night
Mostly clear, with a low around 23.
Saturday
Sunny, with a high near 46.
Saturday Night
Mostly clear, with a low around 28.
Sunday
Mostly sunny, with a high near 50.
Sunday Night
Partly cloudy, with a low around 32.
Monday
Mostly sunny, with a high near 54.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Harristown IL
 39.86°N 89°W (Elev. 643 ft)
Last Update:
2:11 am CST Nov 10, 2026
Forecast Valid:
3am CST Nov 10, 2026-6pm CST Nov 16, 2026
 
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Additional Resources

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