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.

Fog/Mist

48°F

9°C

Humidity 96%
Wind Speed N 12 mph
Barometer 30.03 in (1017.1 mb)
Dewpoint 47°F (8°C)
Visibility 5.00 mi
Wind Chill43°F (6°C)
Last update 6 Nov 1:54 am CST
Extended Forecast for

3 Miles ESE Harristown IL

  • Overnight

    Overnight: A slight chance of drizzle before 3am. Cloudy, with a low around 43. North wind 11 to 13 mph, with gusts as high as 18 mph.

    Low: 43 °F

    Slight Chance
    Drizzle

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 49. North northwest wind 7 to 13 mph, with gusts as high as 18 mph.

    High: 49 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Mostly clear, with a low around 28. North northwest wind around 6 mph becoming calm in the evening.

    Low: 28 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 51. Calm wind becoming northwest around 6 mph.

    High: 51 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 30. Calm wind becoming west southwest around 6 mph after midnight.

    Low: 30 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 61. West southwest wind 6 to 9 mph.

    High: 61 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 35. West wind around 6 mph becoming calm in the evening.

    Low: 35 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 40.

    Low: 40 °F

    Clear

Detailed Forecast

Overnight
A slight chance of drizzle before 3am. Cloudy, with a low around 43. North wind 11 to 13 mph, with gusts as high as 18 mph.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 49. North northwest wind 7 to 13 mph, with gusts as high as 18 mph.
Friday Night
Mostly clear, with a low around 28. North northwest wind around 6 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 51. Calm wind becoming northwest around 6 mph.
Saturday Night
Mostly clear, with a low around 30. Calm wind becoming west southwest around 6 mph after midnight.
Sunday
Sunny, with a high near 61. West southwest wind 6 to 9 mph.
Sunday Night
Mostly clear, with a low around 35. West wind around 6 mph becoming calm in the evening.
Monday
Sunny, with a high near 65.
Monday Night
Clear, with a low around 40.
Tuesday
Sunny, with a high near 65.
Tuesday Night
Mostly clear, with a low around 37.
Veterans Day
Mostly sunny, with a high near 62.
Wednesday Night
Partly cloudy, with a low around 39.
Thursday
Mostly sunny, with a high near 57.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ESE Harristown IL
 39.82°N 89°W (Elev. 656 ft)
Last Update:
12:26 am CST Nov 6, 2026
Forecast Valid:
2am CST Nov 6, 2026-6pm CST Nov 12, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation