Hazardous Weather Conditions
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 Index | 90°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
NOW until 7:00pm Fri

Extreme Heat Warning
Today

High: 98 °F
Hot
Tonight

Low: 73 °F
Mostly Clear
Saturday
High: 96 °F
Sunny then
Slight Chance
ShowersSaturday Night

Low: 69 °F
Mostly Clear
Sunday

High: 88 °F
Sunny
Sunday Night

Low: 62 °F
Mostly Clear
Labor Day

High: 88 °F
Sunny
Monday Night

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.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Blue Mound IL
39.69°N 89.12°W (Elev. 614 ft)
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



