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.

Partly Cloudy

79°F

26°C

Humidity 79%
Wind Speed E 15 G 21 mph
Barometer 30.08 in (1017.7 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 16 Aug 11:54 pm CDT
Extended Forecast for

Bement IL

Heat Advisory until August 17, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until August 17, 08:00pm

    NOW until 8:00pm Sun

    Heat Advisory

  • Overnight

    Low: 74 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 102. Light and variable wind becoming west around 5 mph in the morning.

    High: 93 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 73. Calm wind becoming east southeast around 5 mph after midnight.

    Low: 73 °F

    Partly Cloudy

  • Monday

    Monday: Sunny and hot, with a high near 95. Heat index values as high as 107. Southeast wind 5 to 7 mph becoming southwest in the afternoon.

    High: 95 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 73. South wind around 5 mph.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 95. South southwest wind 6 to 9 mph becoming west in the afternoon.

    High: 95 °F

    Hot

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 69. Northwest wind around 7 mph becoming north northeast after midnight.

    Low: 69 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Partly sunny, with a high near 84.

    High: 84 °F

    Partly Sunny

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms before 3am. Mostly cloudy, with a low around 74. South southwest wind around 5 mph.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 102. Light and variable wind becoming west around 5 mph in the morning.
Sunday Night
Partly cloudy, with a low around 73. Calm wind becoming east southeast around 5 mph after midnight.
Monday
Sunny and hot, with a high near 95. Heat index values as high as 107. Southeast wind 5 to 7 mph becoming southwest in the afternoon.
Monday Night
Mostly clear, with a low around 73. South wind around 5 mph.
Tuesday
Mostly sunny and hot, with a high near 95. South southwest wind 6 to 9 mph becoming west in the afternoon.
Tuesday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 69. Northwest wind around 7 mph becoming north northeast after midnight.
Wednesday
Partly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 64.
Thursday
Sunny, with a high near 84.
Thursday Night
Mostly clear, with a low around 63.
Friday
Sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 64.
Saturday
Sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Bement IL
 39.92°N 88.56°W (Elev. 676 ft)
Last Update:
11:56 pm CDT Aug 16, 2025
Forecast Valid:
12am CDT Aug 17, 2025-6pm CDT Aug 23, 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