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Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fog/Mist

51°F

11°C

Humidity 92%
Wind Speed SE 3 mph
Barometer 30.07 in (1018.3 mb)
Dewpoint 49°F (9°C)
Visibility 5.00 mi
Last update 20 Nov 6:54 pm CST
Extended Forecast for

Decatur Airport IL

Dense Fog Advisory until November 21, 09:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until November 21, 09:00am

    NOW until 9:00am Fri

    Dense Fog Advisory

  • Tonight

    Low: 48 °F

    Chance Rain
    and Patchy
    Fog

  • Friday

    Friday: Rain likely, mainly after 7am. Patchy fog before 10am. Otherwise, cloudy, with a high near 55. East northeast wind 6 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    High: 55 °F

    Rain Likely
    and Patchy
    Fog

  • Friday Night

    Friday Night: A 40 percent chance of rain. Cloudy, then gradually becoming partly cloudy, with a low around 37. North northeast wind 7 to 10 mph, with gusts as high as 15 mph.

    Low: 37 °F

    Chance Rain

  • Saturday

    Saturday: Sunny, with a high near 55. North wind 5 to 7 mph becoming west in the afternoon.

    High: 55 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 35. West southwest wind around 6 mph.

    Low: 35 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 58. West southwest wind 6 to 8 mph.

    High: 58 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 40. South southeast wind around 6 mph.

    Low: 40 °F

    Mostly Cloudy

  • Monday

    Monday: A 50 percent chance of rain. Mostly cloudy, with a high near 58.

    High: 58 °F

    Chance Rain

Detailed Forecast

Tonight
A 40 percent chance of rain, mainly after 3am. Patchy fog. Otherwise, cloudy, with a low around 48. South southeast wind around 5 mph becoming calm.
Friday
Rain likely, mainly after 7am. Patchy fog before 10am. Otherwise, cloudy, with a high near 55. East northeast wind 6 to 11 mph, with gusts as high as 17 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
A 40 percent chance of rain. Cloudy, then gradually becoming partly cloudy, with a low around 37. North northeast wind 7 to 10 mph, with gusts as high as 15 mph.
Saturday
Sunny, with a high near 55. North wind 5 to 7 mph becoming west in the afternoon.
Saturday Night
Mostly clear, with a low around 35. West southwest wind around 6 mph.
Sunday
Sunny, with a high near 58. West southwest wind 6 to 8 mph.
Sunday Night
Mostly cloudy, with a low around 40. South southeast wind around 6 mph.
Monday
A 50 percent chance of rain. Mostly cloudy, with a high near 58.
Monday Night
Rain. Low around 46. Chance of precipitation is 80%.
Tuesday
A 40 percent chance of rain. Mostly cloudy, with a high near 59.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Mostly sunny, with a high near 46.
Wednesday Night
Partly cloudy, with a low around 28.
Thanksgiving Day
Mostly sunny, 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 88.88°W (Elev. 650 ft)
Last Update:
3:16 pm CST Nov 20, 2025
Forecast Valid:
7pm CST Nov 20, 2025-6pm CST Nov 27, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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