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.

Overcast

47°F

8°C

Humidity 50%
Wind Speed SW 5 mph
Barometer 30.28 in (1025.8 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 12 Feb 12:54 pm CST
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 49. Southwest wind around 5 mph becoming southeast.

    High: 49 °F

    Mostly Cloudy

  • Tonight

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

    Low: 30 °F

    Mostly 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.

    Low: 35 °F

    Mostly Clear

  • Washington's Birthday

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

    High: 58 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 49. Southwest wind around 5 mph becoming southeast.
Tonight
Mostly cloudy, with a low around 30. 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.
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.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
1:16 pm CST Feb 12, 2026
Forecast Valid:
1pm 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