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

48°F

9°C

Humidity 93%
Wind Speed SW 9 mph
Barometer 29.78 in (1008.4 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 5 Nov 3:54 am CST
Extended Forecast for

2 Miles ESE Harristown IL

  • Today

    Today: A slight chance of rain before 4pm, then a slight chance of rain after 5pm. Increasing clouds, with a high near 56. West southwest wind 10 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    High: 56 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Tonight

    Tonight: A 30 percent chance of rain, mainly before 8pm. Cloudy, with a low around 42. West wind 9 to 13 mph becoming north after midnight. Winds could gust as high as 18 mph.

    Low: 42 °F

    Chance Rain

  • Friday

    Friday: Cloudy through mid morning, then gradual clearing, with a high near 50. North wind 9 to 15 mph, with gusts as high as 21 mph.

    High: 50 °F

    Gradual
    Clearing

  • Friday Night

    Friday Night: Mostly clear, with a low around 29. North wind 5 to 7 mph becoming calm in the evening.

    Low: 29 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 52. Calm wind becoming northwest around 5 mph.

    High: 52 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 31. Light west wind.

    Low: 31 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 59. Calm wind becoming west 5 to 8 mph in the morning.

    High: 59 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 34.

    Low: 34 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 64.

    High: 64 °F

    Sunny

Detailed Forecast

Today
A slight chance of rain before 4pm, then a slight chance of rain after 5pm. Increasing clouds, with a high near 56. West southwest wind 10 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Tonight
A 30 percent chance of rain, mainly before 8pm. Cloudy, with a low around 42. West wind 9 to 13 mph becoming north after midnight. Winds could gust as high as 18 mph.
Friday
Cloudy through mid morning, then gradual clearing, with a high near 50. North wind 9 to 15 mph, with gusts as high as 21 mph.
Friday Night
Mostly clear, with a low around 29. North wind 5 to 7 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 52. Calm wind becoming northwest around 5 mph.
Saturday Night
Mostly clear, with a low around 31. Light west wind.
Sunday
Sunny, with a high near 59. Calm wind becoming west 5 to 8 mph in the morning.
Sunday Night
Clear, with a low around 34.
Monday
Sunny, with a high near 64.
Monday Night
Mostly clear, with a low around 39.
Tuesday
Sunny, with a high near 65.
Tuesday Night
Mostly clear, with a low around 38.
Veterans Day
Mostly sunny, with a high near 62.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ESE Harristown IL
 39.82°N 89.03°W (Elev. 600 ft)
Last Update:
12:32 am CST Nov 5, 2026
Forecast Valid:
4am CST Nov 5, 2026-6pm CST Nov 11, 2026
 
Forecast Discussion
 
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Additional Resources

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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