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

32°F

0°C

Humidity 92%
Wind Speed Calm
Barometer 30.18 in (1022.6 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 1 Nov 11:54 pm CST
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: Mostly clear, with a low around 29. Light northwest wind.

    Low: 29 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 56. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 56 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 35. Southwest wind around 6 mph.

    Low: 35 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 62. West wind 7 to 10 mph, with gusts as high as 15 mph.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 38. West wind around 5 mph becoming calm in the evening.

    Low: 38 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 66. Light south southeast wind becoming south 8 to 13 mph in the morning. Winds could gust as high as 20 mph.

    High: 66 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 47. South wind around 11 mph, with gusts as high as 17 mph.

    Low: 47 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 29. Light northwest wind.
Sunday
Sunny, with a high near 56. Calm wind becoming south southwest around 6 mph in the afternoon.
Sunday Night
Clear, with a low around 35. Southwest wind around 6 mph.
Monday
Sunny, with a high near 62. West wind 7 to 10 mph, with gusts as high as 15 mph.
Monday Night
Increasing clouds, with a low around 38. West wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 66. Light south southeast wind becoming south 8 to 13 mph in the morning. Winds could gust as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 47. South wind around 11 mph, with gusts as high as 17 mph.
Wednesday
Sunny, with a high near 67.
Wednesday Night
Mostly clear, with a low around 37.
Thursday
Mostly sunny, with a high near 64.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 50.
Friday
A chance of rain. Mostly sunny, with a high near 67.
Friday Night
Partly cloudy, with a low around 45.
Saturday
Mostly sunny, with a high near 65.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
1:36 am CDT Nov 2, 2025
Forecast Valid:
1am CDT Nov 2, 2025-6pm CST Nov 8, 2025
 
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