Current conditions at
Decatur Airport (KDEC)
Lat: 39.83°NLon: 88.87°WElev: 670ft.
Fair
59°F
15°C
| Humidity | 90% |
| Wind Speed | S 5 mph |
| Barometer | 29.94 in (1013.5 mb) |
| Dewpoint | 56°F (13°C) |
| Visibility | 10.00 mi |
| Last update | 16 Apr 11:54 pm CDT |
Extended Forecast for
Decatur IL
Tonight

Low: 57 °F
Clear
Friday

High: 82 °F
Mostly Sunny
Friday Night

Low: 49 °F
T-storms
Saturday

High: 58 °F
Chance
ShowersSaturday Night

Low: 37 °F
Mostly Clear
then Patchy
FrostSunday

High: 58 °F
Patchy Frost
then Mostly
SunnySunday Night

Low: 37 °F
Mostly Clear
then Patchy
FrostMonday

High: 65 °F
Patchy Frost
then SunnyMonday Night

Low: 50 °F
Mostly Clear
Detailed Forecast
Tonight
Clear, with a low around 57. South wind 3 to 6 mph.
Friday
Mostly sunny, with a high near 82. South wind 7 to 17 mph, with gusts as high as 29 mph.
Friday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 11pm. Low around 49. South wind around 16 mph becoming west after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
A 50 percent chance of showers before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 58. West northwest wind 16 to 18 mph, with gusts as high as 29 mph.
Saturday Night
Patchy frost after 3am. Otherwise, mostly clear, with a low around 37. West northwest wind 8 to 15 mph, with gusts as high as 24 mph.
Sunday
Patchy frost before 8am. Otherwise, sunny, with a high near 58. West northwest wind 8 to 16 mph, with gusts as high as 26 mph.
Sunday Night
Patchy frost after 3am. Otherwise, mostly clear, with a low around 37. North northwest wind 5 to 10 mph becoming east after midnight. Winds could gust as high as 17 mph.
Monday
Patchy frost before 8am. Otherwise, sunny, with a high near 65.
Monday Night
Mostly clear, with a low around 50.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Partly cloudy, with a low around 56.
Wednesday
Mostly sunny, with a high near 76.
Wednesday Night
Mostly clear, with a low around 54.
Thursday
Mostly sunny, with a high near 77.
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)
10:36 pm CDT Apr 16, 2026
11pm CDT Apr 16, 2026-6pm CDT Apr 23, 2026


