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

35°F

2°C

Humidity 70%
Wind Speed S 12 mph
Barometer 29.97 in (1015.6 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 9 Feb 9:54 pm CST
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: Mostly clear, with a low around 34. South southwest wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 34 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 52. Southwest wind 9 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.

    High: 52 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 26. North northwest wind around 8 mph, with gusts as high as 15 mph.

    Low: 26 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 44. Northwest wind 6 to 8 mph.

    High: 44 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 28. Northwest wind around 5 mph becoming calm in the evening.

    Low: 28 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Cloudy, with a high near 42. East southeast wind 3 to 6 mph.

    High: 42 °F

    Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 29. East southeast wind around 6 mph.

    Low: 29 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 43.

    High: 43 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 30.

    Low: 30 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 34. South southwest wind 10 to 13 mph, with gusts as high as 21 mph.
Tuesday
Mostly sunny, with a high near 52. Southwest wind 9 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.
Tuesday Night
Mostly clear, with a low around 26. North northwest wind around 8 mph, with gusts as high as 15 mph.
Wednesday
Sunny, with a high near 44. Northwest wind 6 to 8 mph.
Wednesday Night
Increasing clouds, with a low around 28. Northwest wind around 5 mph becoming calm in the evening.
Thursday
Cloudy, with a high near 42. East southeast wind 3 to 6 mph.
Thursday Night
Mostly cloudy, with a low around 29. East southeast wind around 6 mph.
Friday
Partly sunny, with a high near 43.
Friday Night
Mostly cloudy, with a low around 30.
Saturday
A 50 percent chance of rain. Cloudy, with a high near 44.
Saturday Night
Rain likely. Mostly cloudy, with a low around 33.
Sunday
A chance of rain. Partly sunny, with a high near 47.
Sunday Night
Partly cloudy, with a low around 31.
Washington's Birthday
Mostly sunny, with a high near 50.
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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:
9:36 pm CST Feb 9, 2026
Forecast Valid:
10pm CST Feb 9, 2026-6pm CST Feb 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation