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

37°F

3°C

Humidity 86%
Wind Speed Calm
Barometer 29.95 in (1014.2 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Last update 11 Nov 3:54 am CST
Extended Forecast for

Decatur IL

  • Veterans Day

    Veterans Day: A 30 percent chance of showers and thunderstorms, mainly before 3pm. Increasing clouds, with a high near 65. South wind 6 to 15 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph.

    High: 65 °F

    Mostly Sunny
    then Chance
    Showers

  • Tonight

    Tonight: Mostly cloudy, with a low around 40. North northwest wind 9 to 16 mph, with gusts as high as 26 mph.

    Low: 40 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers after 9am. Mostly cloudy, with a high near 47. North northwest wind 11 to 17 mph, with gusts as high as 26 mph.

    High: 47 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 31. North northwest wind 8 to 15 mph, with gusts as high as 21 mph.

    Low: 31 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 43. North northwest wind 9 to 13 mph, with gusts as high as 18 mph.

    High: 43 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 25. North northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 25 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 45. Calm wind becoming north northwest around 5 mph.

    High: 45 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 25.

    Low: 25 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 48.

    High: 48 °F

    Sunny

Detailed Forecast

Veterans Day
A 30 percent chance of showers and thunderstorms, mainly before 3pm. Increasing clouds, with a high near 65. South wind 6 to 15 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph.
Tonight
Mostly cloudy, with a low around 40. North northwest wind 9 to 16 mph, with gusts as high as 26 mph.
Thursday
A 20 percent chance of showers after 9am. Mostly cloudy, with a high near 47. North northwest wind 11 to 17 mph, with gusts as high as 26 mph.
Thursday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 31. North northwest wind 8 to 15 mph, with gusts as high as 21 mph.
Friday
Sunny, with a high near 43. North northwest wind 9 to 13 mph, with gusts as high as 18 mph.
Friday Night
Mostly clear, with a low around 25. North northwest wind 5 to 7 mph becoming calm in the evening.
Saturday
Sunny, with a high near 45. Calm wind becoming north northwest around 5 mph.
Saturday Night
Mostly clear, with a low around 25.
Sunday
Sunny, with a high near 48.
Sunday Night
Mostly clear, with a low around 27.
Monday
Sunny, with a high near 49.
Monday Night
Mostly clear, with a low around 28.
Tuesday
Sunny, with a high near 52.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.86°N 88.94°W (Elev. 682 ft)
Last Update:
3:16 am CST Nov 11, 2026
Forecast Valid:
4am CST Nov 11, 2026-6pm CST Nov 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