Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

85°F

29°C

Humidity 63%
Wind Speed W 7 mph
Barometer 29.99 in (1014.9 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 4 Sep 8:54 am CDT
Extended Forecast for

Blue Mound IL

Extreme Heat Warning September 4, 09:41am until September 4, 07:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning September 4, 09:41am until September 4, 07:00pm

    NOW until 7:00pm Fri

    Extreme Heat Warning

  • Today

    High: 98 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 73. Light south wind.

    Low: 73 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers after 1pm.  Sunny and hot, with a high near 96. Heat index values as high as 104. Calm wind becoming north northwest 5 to 8 mph in the morning.

    High: 96 °F

    Sunny then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 69. East northeast wind around 6 mph.

    Low: 69 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 88. East northeast wind 7 to 11 mph.

    High: 88 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 62. East wind 6 to 10 mph, with gusts as high as 15 mph.

    Low: 62 °F

    Mostly Clear

  • Labor Day

    Labor Day: Sunny, with a high near 88. East wind 6 to 8 mph.

    High: 88 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Today
Sunny and hot, with a high near 98. Heat index values as high as 104. Southwest wind 6 to 9 mph.
Tonight
Mostly clear, with a low around 73. Light south wind.
Saturday
A 20 percent chance of showers after 1pm. Sunny and hot, with a high near 96. Heat index values as high as 104. Calm wind becoming north northwest 5 to 8 mph in the morning.
Saturday Night
Mostly clear, with a low around 69. East northeast wind around 6 mph.
Sunday
Sunny, with a high near 88. East northeast wind 7 to 11 mph.
Sunday Night
Mostly clear, with a low around 62. East wind 6 to 10 mph, with gusts as high as 15 mph.
Labor Day
Sunny, with a high near 88. East wind 6 to 8 mph.
Monday Night
Mostly clear, with a low around 65.
Tuesday
Sunny, with a high near 94.
Tuesday Night
Mostly clear, with a low around 73.
Wednesday
Sunny and hot, with a high near 97.
Wednesday Night
Partly cloudy, with a low around 73.
Thursday
Mostly sunny, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
Blue Mound IL
 39.69°N 89.12°W (Elev. 614 ft)
9:36 am CDT Sep 4, 2026
9am CDT Sep 4, 2026-6pm CDT Sep 10, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database