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

27°F

-3°C

Humidity 85%
Wind Speed S 3 mph
Barometer 30.29 in (1026.4 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Last update 12 Feb 1:54 am CST
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 29. Light west southwest wind.

    Low: 29 °F

    Mostly Cloudy

  • Thursday

    Thursday: Scattered sprinkles before noon, then isolated showers between noon and 1pm. Mostly cloudy, with a high near 47. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 20%.

    High: 47 °F

    Cloudy then
    Isolated
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 30. Southeast wind around 6 mph.

    Low: 30 °F

    Mostly Cloudy

  • Friday

    Friday: Sunny, with a high near 54. South wind 6 to 10 mph, with gusts as high as 16 mph.

    High: 54 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 33. South wind 3 to 6 mph.

    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 7 mph.

    High: 51 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday Night

    Saturday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 39. East southeast wind around 7 mph becoming northeast after midnight.

    Low: 39 °F

    Chance Rain

  • Sunday

    Sunday: Mostly sunny, with a high near 56.

    High: 56 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 29. Light west southwest wind.
Thursday
Scattered sprinkles before noon, then isolated showers between noon and 1pm. Mostly cloudy, with a high near 47. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 20%.
Thursday Night
Mostly cloudy, with a low around 30. Southeast wind around 6 mph.
Friday
Sunny, with a high near 54. South wind 6 to 10 mph, with gusts as high as 16 mph.
Friday Night
Increasing clouds, with a low around 33. South wind 3 to 6 mph.
Saturday
A 30 percent chance of rain after noon. Cloudy, with a high near 51. South southeast wind 3 to 7 mph.
Saturday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 39. East southeast wind around 7 mph becoming northeast after midnight.
Sunday
Mostly sunny, with a high near 56.
Sunday Night
Mostly clear, with a low around 32.
Washington's Birthday
Partly sunny, with a high near 57.
Monday Night
Mostly cloudy, with a low around 42.
Tuesday
Cloudy, with a high near 61.
Tuesday Night
Mostly cloudy, with a low around 51.
Wednesday
Partly sunny, with a high near 62.
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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:
2:26 am CST Feb 12, 2026
Forecast Valid:
2am CST Feb 12, 2026-6pm CST Feb 18, 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