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Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

33°F

1°C

Humidity 92%
Wind Speed Calm
Barometer 30.33 in (1027.3 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Last update 20 Apr 6:54 am CDT
Extended Forecast for

Decatur IL

Frost Advisory April 20, 07:28am until April 20, 08:00am
Click here for hazard details and duration
...
  •  
    Frost Advisory April 20, 07:28am until April 20, 08:00am

    NOW until 8:00am Mon

    Frost Advisory

  • Today

    High: 62 °F

    Areas Frost
    then Sunny

  • Tonight

    Tonight: 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, with a south wind 10 to 20 mph, with gusts as high as 31 mph.

    High: 80 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.

    Low: 62 °F

    Mostly Cloudy
    then Showers
    Likely

Detailed Forecast

Today
Areas of frost before 8am. Otherwise, sunny, with a high near 62. Calm wind becoming south around 6 mph in the afternoon.
Tonight
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, with a south wind 10 to 20 mph, with gusts as high as 31 mph.
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 40 percent 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:
6:36 am CDT Apr 20, 2026
Forecast Valid:
7am CDT Apr 20, 2026-6pm CDT Apr 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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