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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
Click here for hazard details and duration
Frost Advisory
  •  
    Frost Advisory until April 20, 08:00am

    NOW until 8:00am Mon

    Frost Advisory

  • Overnight

    Low: 34 °F

    Areas Frost

  • Monday

    Monday: Widespread frost, mainly before 7am. Otherwise, sunny, with a high near 62. Calm wind becoming south around 6 mph in the afternoon.

    High: 62 °F

    Frost then
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 47. South southeast wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 77 °F

    Mostly Sunny
    then Sunny
    and Breezy

  • Tuesday Night

    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.

    Low: 59 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78. West southwest wind around 9 mph, with gusts as high as 16 mph.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 58. South wind 7 to 9 mph, with gusts as high as 15 mph.

    Low: 58 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 80. Breezy.

    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.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
2:01 am CDT Apr 20, 2026
Forecast Valid:
2am CDT Apr 20, 2026-6pm CDT Apr 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation