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

67°F

19°C

Humidity 47%
Wind Speed NW 17 G 25 mph
Barometer 30.04 in (1017.0 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 5 Nov 11:54 am CST
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 67. Breezy, with a north northwest wind 14 to 20 mph, with gusts as high as 30 mph.

    High: 67 °F

    Sunny and
    Breezy

  • Tonight

    Tonight: Mostly clear, with a low around 34. North northwest wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 17 mph.

    Low: 34 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 62. Light and variable wind becoming south southeast 9 to 14 mph in the morning. Winds could gust as high as 21 mph.

    High: 62 °F

    Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of rain after midnight. Mostly cloudy, with a low around 48. South southeast wind 13 to 15 mph becoming southwest after midnight. Winds could gust as high as 22 mph.

    Low: 48 °F

    Mostly Cloudy
    then Chance
    Rain

  • Friday

    Friday: A 40 percent chance of rain before noon. Mostly cloudy, then gradually becoming sunny, with a high near 71. West wind 11 to 14 mph, with gusts as high as 23 mph.

    High: 71 °F

    Chance Rain
    then Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 39. West wind 5 to 10 mph becoming light northwest after midnight.

    Low: 39 °F

    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of rain after noon. Partly sunny, with a high near 60. Light and variable wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 15 mph.

    High: 60 °F

    Mostly Sunny
    then Chance
    Rain

  • Saturday Night

    Saturday Night: A 40 percent chance of rain before midnight. Mostly cloudy, with a low around 32.

    Low: 32 °F

    Chance Rain
    then Mostly
    Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 67. Breezy, with a north northwest wind 14 to 20 mph, with gusts as high as 30 mph.
Tonight
Mostly clear, with a low around 34. North northwest wind 5 to 10 mph becoming light and variable in the evening. Winds could gust as high as 17 mph.
Thursday
Sunny, with a high near 62. Light and variable wind becoming south southeast 9 to 14 mph in the morning. Winds could gust as high as 21 mph.
Thursday Night
A 50 percent chance of rain after midnight. Mostly cloudy, with a low around 48. South southeast wind 13 to 15 mph becoming southwest after midnight. Winds could gust as high as 22 mph.
Friday
A 40 percent chance of rain before noon. Mostly cloudy, then gradually becoming sunny, with a high near 71. West wind 11 to 14 mph, with gusts as high as 23 mph.
Friday Night
Mostly clear, with a low around 39. West wind 5 to 10 mph becoming light northwest after midnight.
Saturday
A 30 percent chance of rain after noon. Partly sunny, with a high near 60. Light and variable wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 15 mph.
Saturday Night
A 40 percent chance of rain before midnight. Mostly cloudy, with a low around 32.
Sunday
Mostly sunny, with a high near 42.
Sunday Night
Partly cloudy, with a low around 22.
Monday
Sunny, with a high near 40.
Monday Night
Mostly clear, with a low around 23.
Veterans Day
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:
12:36 pm CST Nov 5, 2025
Forecast Valid:
12pm CST Nov 5, 2025-6pm CST Nov 11, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation