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.

Overcast

43°F

6°C

Humidity 56%
Wind Speed SW 7 mph
Barometer 30.30 in (1026.7 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 12 Feb 9:54 am CST
Extended Forecast for

Blue Mound IL

  • Today

    Today: Scattered sprinkles between 11am and noon. Mostly cloudy, with a high near 48. South southwest wind 3 to 7 mph.

    High: 48 °F

    Scattered
    Sprinkles

  • Tonight

    Tonight: Mostly cloudy, with a low around 30. South southeast wind 5 to 7 mph.

    Low: 30 °F

    Mostly Cloudy

  • Friday

    Friday: Sunny, with a high near 54. South wind 7 to 11 mph, with gusts as high as 16 mph.

    High: 54 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 33. South wind around 6 mph.

    Low: 33 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 40 percent chance of rain after noon. Cloudy, with a high near 51. Southeast wind 5 to 8 mph.

    High: 51 °F

    Cloudy then
    Chance Rain

  • Saturday Night

    Saturday Night: Rain likely, mainly before midnight. Mostly cloudy, with a low around 39. East southeast wind around 8 mph becoming northeast after midnight. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 39 °F

    Rain Likely

  • Sunday

    Sunday: Mostly sunny, with a high near 56. North wind 7 to 10 mph.

    High: 56 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

Detailed Forecast

Today
Scattered sprinkles between 11am and noon. Mostly cloudy, with a high near 48. South southwest wind 3 to 7 mph.
Tonight
Mostly cloudy, with a low around 30. South southeast wind 5 to 7 mph.
Friday
Sunny, with a high near 54. South wind 7 to 11 mph, with gusts as high as 16 mph.
Friday Night
Increasing clouds, with a low around 33. South wind around 6 mph.
Saturday
A 40 percent chance of rain after noon. Cloudy, with a high near 51. Southeast wind 5 to 8 mph.
Saturday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 39. East southeast wind around 8 mph becoming northeast after midnight. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Mostly sunny, with a high near 56. North wind 7 to 10 mph.
Sunday Night
Mostly clear, with a low around 32.
Washington's Birthday
Mostly sunny, with a high near 57.
Monday Night
Mostly cloudy, with a low around 41.
Tuesday
Cloudy, with a high near 61.
Tuesday Night
Mostly cloudy, with a low around 51.
Wednesday
Partly sunny, with a high near 62. Breezy.
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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:
9:22 am CST Feb 12, 2026
Forecast Valid:
10am CST Feb 12, 2026-6pm CST Feb 18, 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