Current conditions at
Decatur Airport (KDEC)
Lat: 39.83°NLon: 88.87°WElev: 670ft.
Overcast
25°F
-4°C
| Humidity | 66% |
| Wind Speed | NE 8 mph |
| Barometer | 30.37 in (1029.6 mb) |
| Dewpoint | 15°F (-9°C) |
| Visibility | 10.00 mi |
| Wind Chill | 16°F (-9°C) |
| Last update | 4 Feb 4:54 pm CST |
Extended Forecast for
Decatur IL
Tonight
Low: 11 °F
Mostly Cloudy
then Patchy
FogThursday

High: 31 °F
Mostly Cloudy
Thursday Night

Low: 24 °F
Mostly Cloudy
Friday

High: 41 °F
Partly Sunny
and BreezyFriday Night

Low: 17 °F
Decreasing
CloudsSaturday

High: 28 °F
Mostly Sunny
Saturday Night

Low: 21 °F
Mostly Cloudy
Sunday

High: 43 °F
Partly Sunny
Sunday Night

Low: 26 °F
Mostly Clear
Detailed Forecast
Tonight
Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 11. Wind chill values between 3 and 8. North wind around 6 mph becoming calm.
Thursday
Mostly cloudy, with a high near 31. Wind chill values between 4 and 14. South southwest wind 5 to 13 mph, with gusts as high as 21 mph.
Thursday Night
Mostly cloudy, with a low around 24. South southwest wind 6 to 11 mph, with gusts as high as 18 mph.
Friday
Partly sunny, with a high near 41. Breezy, with a west southwest wind 14 to 20 mph becoming north northwest in the afternoon. Winds could gust as high as 29 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 17. North northwest wind 7 to 15 mph, with gusts as high as 23 mph.
Saturday
Mostly sunny, with a high near 28. North northeast wind around 7 mph becoming southeast in the afternoon.
Saturday Night
Mostly cloudy, with a low around 21. South southeast wind 7 to 10 mph, with gusts as high as 17 mph.
Sunday
Partly sunny, with a high near 43.
Sunday Night
Mostly clear, with a low around 26.
Monday
Mostly sunny, with a high near 50.
Monday Night
Mostly clear, with a low around 34.
Tuesday
Mostly sunny, with a high near 55.
Tuesday Night
A chance of rain. Partly cloudy, with a low around 36.
Wednesday
A chance of rain. Mostly sunny, with a high near 50.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Decatur IL
39.84°N 88.94°W (Elev. 692 ft)
39.84°N 88.94°W (Elev. 692 ft)
5:17 pm CST Feb 4, 2026
5pm CST Feb 4, 2026-6pm CST Feb 11, 2026


