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.

Fog/Mist

41°F

5°C

Humidity 100%
Wind Speed W 9 mph
Barometer 30.15 in (1021.5 mb)
Dewpoint 41°F (5°C)
Visibility 1.75 mi
Wind Chill35°F (2°C)
Last update 23 Nov 5:54 am CST
Extended Forecast for

Decatur Airport IL

Dense Fog Advisory until November 23, 10:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory until November 23, 10:00am

    NOW until 10:00am Sun

    Dense Fog Advisory

  • Today

    High: 54 °F

    Patchy Fog
    then Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 37. South southeast wind 3 to 7 mph.

    Low: 37 °F

    Increasing
    Clouds

  • Monday

    Monday: A 30 percent chance of rain after noon. Mostly cloudy, with a high near 56. South southeast wind 7 to 10 mph, with gusts as high as 17 mph.

    High: 56 °F

    Mostly Cloudy
    then Chance
    Rain

  • Monday Night

    Monday Night: Rain. Low around 47. South southeast wind 5 to 9 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 47 °F

    Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain after noon. Mostly cloudy, with a high near 59. South wind 5 to 9 mph becoming west southwest in the morning.

    High: 59 °F

    Mostly Cloudy
    then Chance
    Rain

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 33. West wind 8 to 18 mph, with gusts as high as 23 mph.

    Low: 33 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 42. Breezy, with a west wind 14 to 21 mph, with gusts as high as 26 mph.

    High: 42 °F

    Mostly Sunny
    and Breezy
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

Detailed Forecast

Today
Patchy fog before 9am. Otherwise, sunny, with a high near 54. Northwest wind around 6 mph becoming calm in the morning.
Tonight
Increasing clouds, with a low around 37. South southeast wind 3 to 7 mph.
Monday
A 30 percent chance of rain after noon. Mostly cloudy, with a high near 56. South southeast wind 7 to 10 mph, with gusts as high as 17 mph.
Monday Night
Rain. Low around 47. South southeast wind 5 to 9 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
A 30 percent chance of rain after noon. Mostly cloudy, with a high near 59. South wind 5 to 9 mph becoming west southwest in the morning.
Tuesday Night
Mostly cloudy, with a low around 33. West wind 8 to 18 mph, with gusts as high as 23 mph.
Wednesday
Mostly sunny, with a high near 42. Breezy, with a west wind 14 to 21 mph, with gusts as high as 26 mph.
Wednesday Night
Partly cloudy, with a low around 23.
Thanksgiving Day
Mostly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 20.
Friday
Partly sunny, with a high near 39.
Friday Night
Mostly cloudy, with a low around 26.
Saturday
A chance of rain. Mostly cloudy, with a high near 42.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur Airport IL
 39.84°N 88.85°W (Elev. 686 ft)
Last Update:
6:56 am CST Nov 23, 2025
Forecast Valid:
7am CST Nov 23, 2025-6pm CST Nov 29, 2025
 
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