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

45°F

7°C

Humidity 77%
Wind Speed Calm
Barometer 30.05 in (1017.6 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 10 Nov 8:54 pm CST
Extended Forecast for

2 Miles WNW Harristown IL

  • Tonight

    Tonight: Increasing clouds, with a low around 43. Light and variable wind.

    Low: 43 °F

    Increasing
    Clouds

  • Veterans Day

    Veterans Day: A slight chance of showers between 10am and noon. Mostly sunny, with a high near 63. South southeast wind 5 to 10 mph becoming west northwest 11 to 16 mph in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 20%.

    High: 63 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 39. North northwest wind 11 to 16 mph, with gusts as high as 21 mph.

    Low: 39 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 47. North northwest wind 11 to 17 mph, with gusts as high as 24 mph.

    High: 47 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 29. North northwest wind 7 to 13 mph, with gusts as high as 17 mph.

    Low: 29 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 43. North northwest wind 9 to 13 mph, with gusts as high as 18 mph.

    High: 43 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 24. North northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 24 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 46.

    High: 46 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 27.

    Low: 27 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 43. Light and variable wind.
Veterans Day
A slight chance of showers between 10am and noon. Mostly sunny, with a high near 63. South southeast wind 5 to 10 mph becoming west northwest 11 to 16 mph in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 39. North northwest wind 11 to 16 mph, with gusts as high as 21 mph.
Thursday
Partly sunny, with a high near 47. North northwest wind 11 to 17 mph, with gusts as high as 24 mph.
Thursday Night
Mostly clear, with a low around 29. North northwest wind 7 to 13 mph, with gusts as high as 17 mph.
Friday
Sunny, with a high near 43. North northwest wind 9 to 13 mph, with gusts as high as 18 mph.
Friday Night
Mostly clear, with a low around 24. North northwest wind 5 to 7 mph becoming calm in the evening.
Saturday
Sunny, with a high near 46.
Saturday Night
Mostly clear, with a low around 27.
Sunday
Sunny, with a high near 49.
Sunday Night
Partly cloudy, with a low around 31.
Monday
Mostly sunny, with a high near 51.
Monday Night
Mostly clear, with a low around 33.
Tuesday
Sunny, with a high near 54.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WNW Harristown IL
 39.85°N 89.08°W (Elev. 653 ft)
Last Update:
7:11 pm CST Nov 10, 2026
Forecast Valid:
9pm CST Nov 10, 2026-6pm CST Nov 17, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation