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.

Rain Fog/Mist

68°F

20°C

Humidity 96%
Wind Speed SE 13 mph
Barometer 29.72 in (1006.1 mb)
Dewpoint 67°F (19°C)
Visibility 4.00 mi
Last update 21 Jun 4:54 pm CDT
Extended Forecast for

Blue Mound IL

Flood Watch June 21, 05:43pm until June 22, 01:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch June 21, 05:43pm until June 22, 01:00am

    NOW until 1:00am Mon

    Flood Watch

  • This Afternoon

    High: 73 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and midnight. Cloudy, with a low around 60. South southwest wind 9 to 14 mph becoming northwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 40%.

    Low: 60 °F

    Chance
    T-storms then
    Cloudy

  • Monday

    Monday: Cloudy, then gradually becoming mostly sunny, with a high near 73. North wind 13 to 15 mph, with gusts as high as 20 mph.

    High: 73 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly clear, with a low around 54. North wind 5 to 9 mph becoming light northeast after midnight.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 78. Northeast wind 3 to 5 mph.

    High: 78 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 58. Light and variable wind.

    Low: 58 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 80. Southeast wind 5 to 7 mph becoming southwest in the afternoon.

    High: 80 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 64. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Cloudy, with a high near 73. South wind around 15 mph, with gusts as high as 23 mph.
Tonight
A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and midnight. Cloudy, with a low around 60. South southwest wind 9 to 14 mph becoming northwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 40%.
Monday
Cloudy, then gradually becoming mostly sunny, with a high near 73. North wind 13 to 15 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 54. North wind 5 to 9 mph becoming light northeast after midnight.
Tuesday
Sunny, with a high near 78. Northeast wind 3 to 5 mph.
Tuesday Night
Partly cloudy, with a low around 58. Light and variable wind.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 80. Southeast wind 5 to 7 mph becoming southwest in the afternoon.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 64. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 81.
Thursday Night
Partly cloudy, with a low around 60.
Friday
A chance of showers. Mostly sunny, with a high near 81.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 84.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Sunday
Partly sunny, with a high near 88. 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:
2:41 pm CDT Jun 21, 2026
Forecast Valid:
5pm CDT Jun 21, 2026-6pm CDT Jun 28, 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