Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Mostly Cloudy

75°F

24°C

Humidity 94%
Wind Speed W 6 mph
Barometer 29.91 in (1012.3 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Last update 19 Aug 8:54 pm CDT
Extended Forecast for

Bement IL

Flood Watch August 19, 08:59pm until August 20, 01:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch August 19, 08:59pm until August 20, 01:00am

    NOW until 1:00am Thu

    Flood Watch

  • Tonight

    Low: 65 °F

    Chance
    T-storms then
    Slight Chance
    T-storms and
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am.  Otherwise, sunny, with a high near 81. Northeast wind around 7 mph.

    High: 81 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 60. North northeast wind around 6 mph becoming calm  in the evening.

    Low: 60 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 83. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms before 1am.  Partly cloudy, with a low around 63. Southwest wind 3 to 5 mph.

    Low: 63 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 82. Northwest wind 6 to 11 mph, with gusts as high as 18 mph.

    High: 82 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 60. North northwest wind 3 to 8 mph.

    Low: 60 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

Detailed Forecast

Tonight
A 50 percent chance of showers and thunderstorms, mainly before midnight. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 65. Light and variable wind becoming northeast around 5 mph after midnight.
Thursday
Patchy fog before 8am. Otherwise, sunny, with a high near 81. Northeast wind around 7 mph.
Thursday Night
Mostly clear, with a low around 60. North northeast wind around 6 mph becoming calm in the evening.
Friday
Sunny, with a high near 83. Calm wind becoming west 5 to 7 mph in the afternoon.
Friday Night
A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 63. Southwest wind 3 to 5 mph.
Saturday
Mostly sunny, with a high near 82. Northwest wind 6 to 11 mph, with gusts as high as 18 mph.
Saturday Night
Mostly clear, with a low around 60. North northwest wind 3 to 8 mph.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Partly cloudy, with a low around 58.
Monday
Mostly sunny, with a high near 81.
Monday Night
Partly cloudy, with a low around 62.
Tuesday
Mostly sunny, with a high near 83.
Tuesday Night
Partly cloudy, with a low around 64.
Wednesday
Mostly sunny, with a high near 84.
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ABOUT THIS FORECAST

 
Point Forecast:
Bement IL
 39.92°N 88.56°W (Elev. 676 ft)
7:36 pm CDT Aug 19, 2026
8pm CDT Aug 19, 2026-6pm CDT Aug 26, 2026
 
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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