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

55°F

13°C

Humidity 74%
Wind Speed SW 14 G 20 mph
Barometer 29.81 in (1009.3 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Wind Chill51°F (11°C)
Last update 4 Nov 10:54 pm CST
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 47. Southwest wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 47 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of rain, mainly after 5pm. Partly sunny, with a high near 58. West southwest wind 9 to 14 mph, with gusts as high as 20 mph.

    High: 58 °F

    Mostly Sunny
    then Chance
    Rain

  • Thursday Night

    Thursday Night: A 30 percent chance of rain, mainly before 8pm. Mostly cloudy, with a low around 41. West wind 7 to 13 mph becoming north northwest after midnight. Winds could gust as high as 16 mph.

    Low: 41 °F

    Chance Rain
    then Cloudy

  • Friday

    Friday: Partly sunny, with a high near 51. North wind 8 to 13 mph, with gusts as high as 18 mph.

    High: 51 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 31. North wind 5 to 7 mph becoming calm in the evening.

    Low: 31 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 52. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 52 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 30. Light northwest wind.

    Low: 30 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 58.

    High: 58 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 47. Southwest wind 8 to 10 mph, with gusts as high as 20 mph.
Thursday
A 30 percent chance of rain, mainly after 5pm. Partly sunny, with a high near 58. West southwest wind 9 to 14 mph, with gusts as high as 20 mph.
Thursday Night
A 30 percent chance of rain, mainly before 8pm. Mostly cloudy, with a low around 41. West wind 7 to 13 mph becoming north northwest after midnight. Winds could gust as high as 16 mph.
Friday
Partly sunny, with a high near 51. North wind 8 to 13 mph, with gusts as high as 18 mph.
Friday Night
Mostly clear, with a low around 31. North wind 5 to 7 mph becoming calm in the evening.
Saturday
Sunny, with a high near 52. Calm wind becoming northwest around 6 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 30. Light northwest wind.
Sunday
Sunny, with a high near 58.
Sunday Night
Mostly clear, with a low around 33.
Monday
Sunny, with a high near 64.
Monday Night
Clear, with a low around 38.
Tuesday
Sunny, with a high near 64.
Tuesday Night
Mostly clear, with a low around 38.
Veterans Day
Sunny, with a high near 64.
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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:
9:46 pm CST Nov 4, 2026
Forecast Valid:
11pm CST Nov 4, 2026-6pm CST Nov 11, 2026
 
Forecast Discussion
 
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Additional Resources

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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