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.

Mostly Cloudy

44°F

7°C

Humidity 89%
Wind Speed N 9 mph
Barometer 30.04 in (1017.3 mb)
Dewpoint 41°F (5°C)
Visibility 7.00 mi
Wind Chill39°F (4°C)
Last update 22 Nov 2:54 am CST
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 37. North wind around 6 mph.

    Low: 37 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 53. North wind around 6 mph becoming light and variable.

    High: 53 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 36. Southwest wind 6 to 8 mph becoming west northwest after midnight. Winds could gust as high as 17 mph.

    Low: 36 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 56. West northwest wind around 5 mph becoming calm in the afternoon.

    High: 56 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 36. Calm wind becoming south southeast around 6 mph after midnight.

    Low: 36 °F

    Increasing
    Clouds

  • Monday

    Monday: A 50 percent chance of rain after noon. Mostly cloudy, with a high near 55. South southeast wind 6 to 11 mph, with gusts as high as 18 mph.

    High: 55 °F

    Mostly Cloudy
    then Chance
    Rain

  • Monday Night

    Monday Night: Rain. Low around 48. South southeast wind 9 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 48 °F

    Rain then
    Rain Likely

  • Tuesday

    Tuesday: A 30 percent chance of rain. Mostly cloudy, with a high near 61.

    High: 61 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 34.

    Low: 34 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 37. North wind around 6 mph.
Saturday
Sunny, with a high near 53. North wind around 6 mph becoming light and variable.
Saturday Night
Mostly clear, with a low around 36. Southwest wind 6 to 8 mph becoming west northwest after midnight. Winds could gust as high as 17 mph.
Sunday
Sunny, with a high near 56. West northwest wind around 5 mph becoming calm in the afternoon.
Sunday Night
Increasing clouds, with a low around 36. Calm wind becoming south southeast around 6 mph after midnight.
Monday
A 50 percent chance of rain after noon. Mostly cloudy, with a high near 55. South southeast wind 6 to 11 mph, with gusts as high as 18 mph.
Monday Night
Rain. Low around 48. South southeast wind 9 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
A 30 percent chance of rain. Mostly cloudy, with a high near 61.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Partly sunny, with a high near 44.
Wednesday Night
Partly cloudy, with a low around 25.
Thanksgiving Day
Mostly sunny, with a high near 40.
Thursday Night
Partly cloudy, with a low around 23.
Friday
Mostly sunny, with a high near 39.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
3:16 am CST Nov 22, 2025
Forecast Valid:
3am CST Nov 22, 2025-6pm CST Nov 28, 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