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.

Light Rain Fog/Mist

41°F

5°C

Humidity 86%
Wind Speed NW 17 G 26 mph
Barometer 29.85 in (1010.9 mb)
Dewpoint 37°F (3°C)
Visibility 5.00 mi
Wind Chill33°F (1°C)
Last update 11 Mar 12:54 pm CDT
Extended Forecast for

3 Miles SW Harristown IL

  • This Afternoon

    This Afternoon: A 50 percent chance of showers, mainly before 3pm. Cloudy, with a steady temperature around 42. Breezy, with a northwest wind 20 to 22 mph, with gusts as high as 34 mph.

    High: 42 °F

    Chance
    Showers and
    Breezy

  • Tonight

    Tonight: Cloudy during the early evening, then gradual clearing, with a low around 29. Blustery, with a north northwest wind 16 to 21 mph decreasing to 8 to 13 mph after midnight. Winds could gust as high as 30 mph.

    Low: 29 °F

    Gradual
    Clearing and
    Blustery then
    Clear

  • Thursday

    Thursday: Increasing clouds, with a high near 50. West wind 6 to 14 mph, with gusts as high as 18 mph.

    High: 50 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 41. Breezy, with a south wind 14 to 19 mph increasing to 20 to 25 mph after midnight. Winds could gust as high as 37 mph.

    Low: 41 °F

    Mostly Cloudy
    and Breezy

  • Friday

    Friday: Partly sunny, with a high near 55. Breezy, with a west wind 18 to 23 mph, with gusts as high as 33 mph.

    High: 55 °F

    Partly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 33. Northwest wind 6 to 10 mph becoming east northeast after midnight. Winds could gust as high as 16 mph.

    Low: 33 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 55. East southeast wind 9 to 14 mph, with gusts as high as 20 mph.

    High: 55 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 46. Breezy.

    Low: 46 °F

    Mostly Cloudy
    then Chance
    Showers and
    Breezy

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm, then showers after 1pm. High near 60. Breezy. Chance of precipitation is 90%.

    High: 60 °F

    Showers and
    Breezy

Detailed Forecast

This Afternoon
A 50 percent chance of showers, mainly before 3pm. Cloudy, with a steady temperature around 42. Breezy, with a northwest wind 20 to 22 mph, with gusts as high as 34 mph.
Tonight
Cloudy during the early evening, then gradual clearing, with a low around 29. Blustery, with a north northwest wind 16 to 21 mph decreasing to 8 to 13 mph after midnight. Winds could gust as high as 30 mph.
Thursday
Increasing clouds, with a high near 50. West wind 6 to 14 mph, with gusts as high as 18 mph.
Thursday Night
Mostly cloudy, with a low around 41. Breezy, with a south wind 14 to 19 mph increasing to 20 to 25 mph after midnight. Winds could gust as high as 37 mph.
Friday
Partly sunny, with a high near 55. Breezy, with a west wind 18 to 23 mph, with gusts as high as 33 mph.
Friday Night
Mostly cloudy, with a low around 33. Northwest wind 6 to 10 mph becoming east northeast after midnight. Winds could gust as high as 16 mph.
Saturday
Mostly cloudy, with a high near 55. East southeast wind 9 to 14 mph, with gusts as high as 20 mph.
Saturday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 46. Breezy.
Sunday
Showers likely and possibly a thunderstorm, then showers after 1pm. High near 60. Breezy. Chance of precipitation is 90%.
Sunday Night
A chance of rain and snow showers before 1am. Mostly cloudy, with a low around 21. Blustery. Chance of precipitation is 40%.
Monday
Mostly sunny, with a high near 31. Blustery.
Monday Night
Partly cloudy, with a low around 16.
Tuesday
Partly sunny, with a high near 36.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Harristown IL
 39.8°N 89.12°W (Elev. 594 ft)
Last Update:
11:52 am CDT Mar 11, 2026
Forecast Valid:
1pm CDT Mar 11, 2026-6pm CDT Mar 17, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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