Current conditions at
Decatur Airport (KDEC)
Lat: 39.83°NLon: 88.87°WElev: 670ft.
Overcast
36°F
2°C
| Humidity | 70% |
| Wind Speed | NW 16 G 23 mph |
| Barometer | 30.01 in (1016.5 mb) |
| Dewpoint | 27°F (-3°C) |
| Visibility | 10.00 mi |
| Wind Chill | 26°F (-3°C) |
| Last update | 13 Nov 1:54 am CST |
Extended Forecast for
Illiopolis IL
Overnight
Low: 31 °F
Partly Cloudy
Friday
High: 44 °F
Mostly Sunny
Friday Night
Low: 25 °F
Mostly Clear
Saturday
High: 47 °F
Sunny
Saturday Night
Low: 23 °F
Clear
Sunday
High: 50 °F
Sunny
Sunday Night
Low: 27 °F
Clear
Monday
High: 51 °F
Sunny
Monday Night
Low: 27 °F
Clear
Detailed Forecast
Overnight
Partly cloudy, with a low around 31. North northwest wind around 10 mph, with gusts as high as 15 mph.
Friday
Mostly sunny, with a high near 44. North northwest wind 9 to 15 mph, with gusts as high as 24 mph.
Friday Night
Mostly clear, with a low around 25. North northwest wind 5 to 9 mph becoming light.
Saturday
Sunny, with a high near 47. North northwest wind 3 to 6 mph.
Saturday Night
Clear, with a low around 23. Light north wind.
Sunday
Sunny, with a high near 50. Calm wind.
Sunday Night
Clear, with a low around 27. Calm wind.
Monday
Sunny, with a high near 51.
Monday Night
Clear, with a low around 27.
Tuesday
Sunny, with a high near 54.
Tuesday Night
Clear, with a low around 28.
Wednesday
Sunny, with a high near 59.
Wednesday Night
Partly cloudy, with a low around 38.
Thursday
Partly sunny, with a high near 62.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Illiopolis IL
39.85°N 89.26°W (Elev. 607 ft)
39.85°N 89.26°W (Elev. 607 ft)
2:21 am CST Nov 13, 2026
2am CST Nov 13, 2026-6pm CST Nov 19, 2026
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