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.

A Few Clouds

27°F

-3°C

Humidity 92%
Wind Speed SE 3 mph
Barometer 30.23 in (1024.1 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 12 Feb 10:54 pm CST
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: Partly cloudy, with a low around 29. South southeast wind around 6 mph.

    Low: 29 °F

    Partly 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 around 6 mph becoming calm after midnight.

    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 6 mph.

    High: 51 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday Night

    Saturday Night: Rain likely, mainly before midnight. Cloudy, with a low around 40. Southeast wind around 7 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 around 7 mph.

    High: 57 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 35. North wind around 5 mph becoming light and variable.

    Low: 35 °F

    Mostly Clear

  • Washington's Birthday

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

    High: 58 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 29. South southeast wind around 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 around 6 mph becoming calm after midnight.
Saturday
A 30 percent chance of rain after noon. Cloudy, with a high near 51. South southeast wind 3 to 6 mph.
Saturday Night
Rain likely, mainly before midnight. Cloudy, with a low around 40. Southeast wind around 7 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 around 7 mph.
Sunday Night
Mostly clear, with a low around 35. North wind around 5 mph becoming light and variable.
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.
Wednesday Night
Partly cloudy, with a low around 42.
Thursday
Mostly sunny, with a high near 56.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
9:37 pm CST Feb 12, 2026
Forecast Valid:
11pm CST Feb 12, 2026-6pm CST Feb 19, 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