Hazardous Weather Conditions
Current conditions at
Decatur Airport (KDEC)
Lat: 39.83°NLon: 88.87°WElev: 670ft.
Fair
39°F
4°C
| Humidity | 65% |
| Wind Speed | N 3 mph |
| Barometer | 30.29 in (1026.0 mb) |
| Dewpoint | 28°F (-2°C) |
| Visibility | 10.00 mi |
| Last update | 20 Apr 1:54 am CDT |
Extended Forecast for
Decatur IL
Frost Advisory until April 20, 08:00am
NOW until 8:00am Mon

Frost Advisory
Overnight

Low: 34 °F
Areas Frost
Monday

High: 62 °F
Frost then
SunnyMonday Night

Low: 47 °F
Mostly Clear
Tuesday
High: 77 °F
Mostly Sunny
then Sunny
and BreezyTuesday Night
Low: 59 °F
Partly Cloudy
then Chance
ShowersWednesday

High: 78 °F
Mostly Sunny
Wednesday Night

Low: 58 °F
Mostly Clear
Thursday
High: 80 °F
Mostly Sunny
then Mostly
Sunny and
Breezy
Detailed Forecast
Overnight
Areas of frost. Otherwise, clear, with a low around 34. North wind 3 to 5 mph.
Monday
Widespread frost, mainly before 7am. Otherwise, sunny, with a high near 62. Calm wind becoming south around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 47. South southeast wind 7 to 11 mph, with gusts as high as 21 mph.
Tuesday
Mostly sunny, with a high near 77. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.
Tuesday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 59. Southwest wind 10 to 14 mph, with gusts as high as 23 mph.
Wednesday
Mostly sunny, with a high near 78. West southwest wind around 9 mph, with gusts as high as 16 mph.
Wednesday Night
Mostly clear, with a low around 58. South wind 7 to 9 mph, with gusts as high as 15 mph.
Thursday
Mostly sunny, with a high near 80. Breezy.
Thursday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.
Friday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 74. Chance of precipitation is 70%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 50.
Saturday
Mostly sunny, with a high near 70.
Saturday Night
Partly cloudy, with a low around 49.
Sunday
Mostly sunny, with a high near 70.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
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)
2:01 am CDT Apr 20, 2026
2am CDT Apr 20, 2026-6pm CDT Apr 26, 2026



