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.

Overcast

51°F

11°C

Humidity 89%
Wind Speed Calm
Barometer 29.92 in (1013.4 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 18 Nov 4:54 pm CST
Extended Forecast for

Harristown IL

  • Tonight

    Tonight: Cloudy, with a low around 42. Northeast wind around 7 mph.

    Low: 42 °F

    Cloudy

  • Wednesday

    Wednesday: Cloudy, with a high near 53. Northeast wind around 6 mph becoming calm in the afternoon.

    High: 53 °F

    Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 42. Light and variable wind.

    Low: 42 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 50 percent chance of rain. Cloudy, with a high near 58. South wind 5 to 10 mph.

    High: 58 °F

    Chance Rain

  • Thursday Night

    Thursday Night: A 40 percent chance of rain. Cloudy, with a low around 47. South wind around 6 mph becoming light and variable.

    Low: 47 °F

    Chance Rain

  • Friday

    Friday: Rain likely, mainly after noon. Cloudy, with a high near 56. Northeast wind 7 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    High: 56 °F

    Rain Likely

  • Friday Night

    Friday Night: Rain likely, mainly before midnight. Mostly cloudy, with a low around 40. Northeast wind 7 to 10 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 40 °F

    Rain Likely
    then Chance
    Rain

  • Saturday

    Saturday: Mostly sunny, with a high near 56.

    High: 56 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

Detailed Forecast

Tonight
Cloudy, with a low around 42. Northeast wind around 7 mph.
Wednesday
Cloudy, with a high near 53. Northeast wind around 6 mph becoming calm in the afternoon.
Wednesday Night
Mostly cloudy, with a low around 42. Light and variable wind.
Thursday
A 50 percent chance of rain. Cloudy, with a high near 58. South wind 5 to 10 mph.
Thursday Night
A 40 percent chance of rain. Cloudy, with a low around 47. South wind around 6 mph becoming light and variable.
Friday
Rain likely, mainly after noon. Cloudy, with a high near 56. Northeast wind 7 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 40. Northeast wind 7 to 10 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Mostly sunny, with a high near 56.
Saturday Night
Mostly clear, with a low around 37.
Sunday
Sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 40.
Monday
Mostly sunny, with a high near 59.
Monday Night
A chance of rain. Mostly cloudy, with a low around 40.
Tuesday
A chance of rain. Mostly cloudy, with a high near 55.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Harristown IL
 39.84°N 89.06°W (Elev. 699 ft)
Last Update:
4:11 pm CST Nov 18, 2025
Forecast Valid:
5pm CST Nov 18, 2025-6pm CST Nov 25, 2025
 
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