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.

Overcast

73°F

23°C

Humidity 94%
Wind Speed Calm
Barometer 30.06 in (1017.4 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 13 Jul 11:54 pm CDT
Extended Forecast for

Bement 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: 67 °F

    Patchy Dense
    Fog

  • Monday

    Monday: Areas of dense fog before 8am. Otherwise, mostly sunny, with a high near 86. Light and variable wind becoming east northeast around 6 mph in the morning.

    High: 86 °F

    Areas Dense
    Fog then
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 68. Light east wind.

    Low: 68 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87. South wind 5 to 7 mph.

    High: 87 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 71. South wind around 6 mph.

    Low: 71 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. South southwest wind 6 to 10 mph, with gusts as high as 15 mph.

    High: 88 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 72. South southwest wind 7 to 9 mph.

    Low: 72 °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
Patchy dense fog. Otherwise, mostly cloudy, with a low around 67. Calm wind.
Monday
Areas of dense fog before 8am. Otherwise, mostly sunny, with a high near 86. Light and variable wind becoming east northeast around 6 mph in the morning.
Monday Night
Partly cloudy, with a low around 68. Light east wind.
Tuesday
A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87. South wind 5 to 7 mph.
Tuesday Night
Mostly cloudy, with a low around 71. South wind around 6 mph.
Wednesday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. South 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 72. South southwest wind 7 to 9 mph.
Thursday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Chance of precipitation is 40%.
Friday
A 40 percent chance of showers after 1pm. Partly sunny, with a high near 85.
Friday Night
Mostly cloudy, with a low around 68.
Saturday
A chance of showers. Partly sunny, with a high near 87.
Saturday Night
Partly cloudy, with a low around 69.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Bement IL
 39.92°N 88.56°W (Elev. 676 ft)
Last Update:
12:11 am CDT Jul 14, 2025
Forecast Valid:
12am CDT Jul 14, 2025-6pm CDT Jul 20, 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