National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Overcast

23°F

-5°C

Humidity 78%
Wind Speed SW 14 mph
Barometer 30.15 in (1021.9 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill11°F (-12°C)
Last update 2 Feb 12:54 am CST
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: A 20 percent chance of snow before 3am. Cloudy, with a low around 20. South southwest wind 7 to 9 mph, with gusts as high as 18 mph.

    Low: 20 °F

    Slight Chance
    Snow

  • Monday

    Monday: Mostly cloudy, with a high near 30. West northwest wind 5 to 9 mph.

    High: 30 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 19. Light and variable wind.

    Low: 19 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Cloudy, then gradually becoming mostly sunny, with a high near 29. Northeast wind 3 to 7 mph.

    High: 29 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 11. North wind around 6 mph.

    Low: 11 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 26. North wind around 5 mph becoming light and variable in the afternoon.

    High: 26 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 9. Calm wind becoming west southwest around 5 mph after midnight.

    Low: 9 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 33.

    High: 33 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 27.

    Low: 27 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of snow before 3am. Cloudy, with a low around 20. South southwest wind 7 to 9 mph, with gusts as high as 18 mph.
Monday
Mostly cloudy, with a high near 30. West northwest wind 5 to 9 mph.
Monday Night
Mostly cloudy, with a low around 19. Light and variable wind.
Tuesday
Cloudy, then gradually becoming mostly sunny, with a high near 29. Northeast wind 3 to 7 mph.
Tuesday Night
Partly cloudy, with a low around 11. North wind around 6 mph.
Wednesday
Mostly sunny, with a high near 26. North wind around 5 mph becoming light and variable in the afternoon.
Wednesday Night
Partly cloudy, with a low around 9. Calm wind becoming west southwest around 5 mph after midnight.
Thursday
Partly sunny, with a high near 33.
Thursday Night
Partly cloudy, with a low around 27.
Friday
Partly sunny, with a high near 37.
Friday Night
Partly cloudy, with a low around 15.
Saturday
Mostly sunny, with a high near 28.
Saturday Night
Partly cloudy, with a low around 19.
Sunday
Partly sunny, with a high near 35.
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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:
12:36 am CST Feb 2, 2026
Forecast Valid:
12am CST Feb 2, 2026-6pm CST Feb 8, 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