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 65%
Wind Speed S 9 mph
Barometer 30.20 in (1023.8 mb)
Dewpoint 13°F (-11°C)
Visibility 10.00 mi
Wind Chill13°F (-11°C)
Last update 1 Feb 6:54 pm CST
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: Snow likely, mainly before midnight. Cloudy, with a low around 18. South wind 6 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of less than a half inch possible.

    Low: 18 °F

    Snow Likely
    then 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

Tonight
Snow likely, mainly before midnight. Cloudy, with a low around 18. South wind 6 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of less than a half inch possible.
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:
6:51 pm CST Feb 1, 2026
Forecast Valid:
7pm CST Feb 1, 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