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.

Overcast

46°F

8°C

Humidity 58%
Wind Speed S 3 mph
Barometer 30.24 in (1024.6 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 12 Feb 2:54 pm CST
Extended Forecast for

2 Miles ENE Harristown IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 49. Southeast wind around 5 mph.

    High: 49 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 30. South southeast wind 3 to 6 mph.

    Low: 30 °F

    Mostly Cloudy

  • Friday

    Friday: Sunny, with a high near 55. South southwest wind 6 to 14 mph, with gusts as high as 20 mph.

    High: 55 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 33. South wind 3 to 6 mph.

    Low: 33 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 30 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, mainly before midnight. Mostly cloudy, with a low around 40. Southeast wind 6 to 8 mph becoming east northeast after midnight. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 40 °F

    Rain Likely

  • Sunday

    Sunday: Mostly sunny, with a high near 57. Northeast wind 7 to 9 mph.

    High: 57 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 34.

    Low: 34 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 58.

    High: 58 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 49. Southeast wind around 5 mph.
Tonight
Mostly cloudy, with a low around 30. South southeast wind 3 to 6 mph.
Friday
Sunny, with a high near 55. South southwest wind 6 to 14 mph, with gusts as high as 20 mph.
Friday Night
Increasing clouds, with a low around 33. South wind 3 to 6 mph.
Saturday
A 30 percent chance of rain after noon. Cloudy, with a high near 51. South southeast wind 3 to 7 mph.
Saturday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 40. Southeast wind 6 to 8 mph becoming east northeast after midnight. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Mostly sunny, with a high near 57. Northeast wind 7 to 9 mph.
Sunday Night
Mostly clear, with a low around 34.
Washington's Birthday
Partly sunny, with a high near 58.
Monday Night
Mostly cloudy, with a low around 42.
Tuesday
Mostly cloudy, with a high near 61.
Tuesday Night
Mostly cloudy, with a low around 52.
Wednesday
Mostly cloudy, with a high near 67. Breezy.
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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:
3:17 pm CST Feb 12, 2026
Forecast Valid:
3pm CST Feb 12, 2026-6pm CST Feb 18, 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