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Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Overcast

72°F

22°C

Humidity 94%
Wind Speed Calm
Barometer 30.06 in (1017.2 mb)
Dewpoint 70°F (21°C)
Visibility 9.00 mi
Last update 14 Jul 12:54 am CDT
Extended Forecast for

Decatur Airport IL

Dense Fog Advisory until July 14, 10:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until July 14, 10:00am

    NOW until 10:00am Mon

    Dense Fog Advisory

  • Overnight

    Low: 69 °F

    Areas Dense
    Fog

  • Monday

    Monday: Areas of dense fog before 8am. Otherwise, mostly sunny, with a high near 86. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 86 °F

    Areas Dense
    Fog then
    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 70. Light east southeast wind.

    Low: 70 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. East southeast wind 5 to 7 mph becoming south in the afternoon.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 73. South wind around 6 mph.

    Low: 73 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Southwest wind 6 to 10 mph, with gusts as high as 15 mph.

    High: 91 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. South southwest wind around 9 mph.

    Low: 73 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

Detailed Forecast

Overnight
Areas of dense fog. Otherwise, mostly cloudy, with a low around 69. Calm wind.
Monday
Areas of dense fog before 8am. Otherwise, mostly sunny, with a high near 86. Calm wind becoming south southeast around 5 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 70. Light east southeast wind.
Tuesday
A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. East southeast wind 5 to 7 mph becoming south in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 73. South wind around 6 mph.
Wednesday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Southwest wind 6 to 10 mph, with gusts as high as 15 mph.
Wednesday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. South southwest wind around 9 mph.
Thursday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.
Thursday Night
A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 72.
Friday
A 40 percent chance of showers after 1pm. Partly sunny, with a high near 86.
Friday Night
Partly cloudy, with a low around 70.
Saturday
A chance of showers. Mostly sunny, with a high near 89.
Saturday Night
Partly cloudy, with a low around 71.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur Airport IL
 39.84°N 88.88°W (Elev. 650 ft)
Last Update:
12:26 am CDT Jul 14, 2025
Forecast Valid:
1am CDT Jul 14, 2025-6pm CDT Jul 20, 2025
 
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