National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Mostly Cloudy

80°F

27°C

Humidity 64%
Wind Speed N 16 G 23 mph
Barometer 29.86 in (1010.6 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 2 Aug 3:54 pm CDT
Extended Forecast for

Blue Mound IL

  • Tonight

    Tonight: Mostly clear, with a low around 61. North wind 6 to 11 mph becoming light north northeast after midnight. Winds could gust as high as 18 mph.

    Low: 61 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 83. Northeast wind 3 to 5 mph.

    High: 83 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 61. East wind 3 to 6 mph.

    Low: 61 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84. Light south southeast wind.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 62. Light east southeast wind.

    Low: 62 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 85. Calm wind becoming south around 5 mph in the afternoon.

    High: 85 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66. South southeast wind 3 to 5 mph.

    Low: 66 °F

    Partly Cloudy
    then Chance
    T-storms

  • Thursday

    Thursday: Showers likely before 1pm. Partly sunny, with a high near 83. Chance of precipitation is 60%.

    High: 83 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 66.

    Low: 66 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 61. North wind 6 to 11 mph becoming light north northeast after midnight. Winds could gust as high as 18 mph.
Monday
Mostly sunny, with a high near 83. Northeast wind 3 to 5 mph.
Monday Night
Mostly clear, with a low around 61. East wind 3 to 6 mph.
Tuesday
Sunny, with a high near 84. Light south southeast wind.
Tuesday Night
Mostly clear, with a low around 62. Light east southeast wind.
Wednesday
Sunny, with a high near 85. Calm wind becoming south around 5 mph in the afternoon.
Wednesday Night
A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66. South southeast wind 3 to 5 mph.
Thursday
Showers likely before 1pm. Partly sunny, with a high near 83. Chance of precipitation is 60%.
Thursday Night
Mostly cloudy, with a low around 66.
Friday
A 30 percent chance of showers after 1pm. Partly sunny, with a high near 84.
Friday Night
Partly cloudy, with a low around 67.
Saturday
Mostly sunny, with a high near 86.
Saturday Night
Partly cloudy, with a low around 68.
Sunday
Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Blue Mound IL
 39.69°N 89.12°W (Elev. 614 ft)
Last Update:
3:36 pm CDT Aug 2, 2026
Forecast Valid:
4pm CDT Aug 2, 2026-6pm CDT Aug 9, 2026
 
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