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.

Fair

36°F

2°C

Humidity 93%
Wind Speed Calm
Barometer 29.91 in (1013.2 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 11 Nov 5:54 am CST
Extended Forecast for

Harristown IL

  • Veterans Day

    Veterans Day: A slight chance of showers and thunderstorms between noon and 5pm. Increasing clouds, with a high near 65. South wind 6 to 16 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 20%.

    High: 65 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: Mostly cloudy, with a low around 40. North northwest wind 9 to 16 mph, with gusts as high as 26 mph.

    Low: 40 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers after 10am. Mostly cloudy, with a high near 46. North northwest wind 13 to 18 mph, with gusts as high as 26 mph.

    High: 46 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 30. North northwest wind 8 to 15 mph, with gusts as high as 21 mph.

    Low: 30 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 42. North northwest wind 9 to 15 mph, with gusts as high as 20 mph.

    High: 42 °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 45. Calm wind becoming north northwest around 5 mph.

    High: 45 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 24.

    Low: 24 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 48.

    High: 48 °F

    Sunny

Detailed Forecast

Veterans Day
A slight chance of showers and thunderstorms between noon and 5pm. Increasing clouds, with a high near 65. South wind 6 to 16 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 20%.
Tonight
Mostly cloudy, with a low around 40. North northwest wind 9 to 16 mph, with gusts as high as 26 mph.
Thursday
A 20 percent chance of showers after 10am. Mostly cloudy, with a high near 46. North northwest wind 13 to 18 mph, with gusts as high as 26 mph.
Thursday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 30. North northwest wind 8 to 15 mph, with gusts as high as 21 mph.
Friday
Sunny, with a high near 42. North northwest wind 9 to 15 mph, with gusts as high as 20 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 45. Calm wind becoming north northwest around 5 mph.
Saturday Night
Mostly clear, with a low around 24.
Sunday
Sunny, with a high near 48.
Sunday Night
Mostly clear, with a low around 27.
Monday
Sunny, with a high near 49.
Monday Night
Mostly clear, with a low around 28.
Tuesday
Sunny, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Harristown IL
 39.84°N 89.06°W (Elev. 699 ft)
Last Update:
5:16 am CST Nov 11, 2026
Forecast Valid:
6am CST Nov 11, 2026-6pm CST Nov 17, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation