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

33°F

1°C

Humidity 75%
Wind Speed S 8 mph
Barometer 30.22 in (1023.8 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 13 Feb 5:54 am CST
Extended Forecast for

2 Miles ENE Harristown IL

  • Today

    Today: Sunny, with a high near 55. South southwest wind 7 to 14 mph, with gusts as high as 20 mph.

    High: 55 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 33. South wind 3 to 7 mph.

    Low: 33 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 40 percent chance of rain after noon. Cloudy, with a high near 51. South southeast wind 3 to 7 mph.

    High: 51 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday Night

    Saturday Night: Rain likely. Cloudy, with a low around 40. East wind 6 to 8 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 40 °F

    Rain Likely

  • Sunday

    Sunday: Cloudy through mid morning, then gradual clearing, with a high near 57. Northeast wind 6 to 9 mph.

    High: 57 °F

    Gradual
    Clearing

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36. North wind around 5 mph becoming light and variable.

    Low: 36 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 58. South wind 5 to 9 mph.

    High: 58 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 60.

    High: 60 °F

    Mostly Cloudy

Detailed Forecast

Today
Sunny, with a high near 55. South southwest wind 7 to 14 mph, with gusts as high as 20 mph.
Tonight
Increasing clouds, with a low around 33. South wind 3 to 7 mph.
Saturday
A 40 percent chance of rain after noon. Cloudy, with a high near 51. South southeast wind 3 to 7 mph.
Saturday Night
Rain likely. Cloudy, with a low around 40. East wind 6 to 8 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Cloudy through mid morning, then gradual clearing, with a high near 57. Northeast wind 6 to 9 mph.
Sunday Night
Mostly clear, with a low around 36. North wind around 5 mph becoming light and variable.
Washington's Birthday
Partly sunny, with a high near 58. South wind 5 to 9 mph.
Monday Night
Mostly cloudy, with a low around 41.
Tuesday
Mostly cloudy, with a high near 60.
Tuesday Night
Mostly cloudy, with a low around 51.
Wednesday
Partly sunny, with a high near 67. Breezy.
Wednesday Night
A chance of rain. Partly cloudy, with a low around 43.
Thursday
Mostly sunny, with a high near 59.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Harristown IL
 39.84°N 89.03°W (Elev. 666 ft)
Last Update:
5:37 am CST Feb 13, 2026
Forecast Valid:
6am CST Feb 13, 2026-6pm CST Feb 19, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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