Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

47°F

8°C

Humidity 48%
Wind Speed N 13 mph
Barometer 30.25 in (1024.4 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 19 Apr 9:54 pm CDT
Extended Forecast for

Decatur IL

Frost Advisory April 20, 01:00am until April 20, 08:00am
Click here for hazard details and duration
Frost Advisory
  • Tonight

    Tonight: Areas of frost after 3am.  Otherwise, clear, with a low around 33. North wind 3 to 7 mph. Winds could gust as high as 15 mph.

    Low: 33 °F

    Mostly Clear
    then Areas
    Frost

  • Monday

    Monday: Widespread frost, mainly before 7am.  Otherwise, sunny, with a high near 61. Light and variable wind becoming east around 6 mph in the afternoon.

    High: 61 °F

    Frost then
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 47. South wind 7 to 10 mph, with gusts as high as 20 mph.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77. Southwest wind 11 to 18 mph, with gusts as high as 29 mph.

    High: 77 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms before 1am.  Partly cloudy, with a low around 59. Southwest wind 10 to 14 mph, with gusts as high as 22 mph.

    Low: 59 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78. West southwest wind around 9 mph, with gusts as high as 15 mph.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 58. South wind 8 to 10 mph, with gusts as high as 16 mph.

    Low: 58 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 80. Breezy.

    High: 80 °F

    Sunny then
    Mostly Sunny
    and Breezy

  • Thursday Night

    Thursday Night: Showers likely, mainly after 1am.  Mostly cloudy, with a low around 61. Breezy.  Chance of precipitation is 70%.

    Low: 61 °F

    Chance
    Showers and
    Breezy then
    Showers
    Likely

Detailed Forecast

Tonight
Areas of frost after 3am. Otherwise, clear, with a low around 33. North wind 3 to 7 mph. Winds could gust as high as 15 mph.
Monday
Widespread frost, mainly before 7am. Otherwise, sunny, with a high near 61. Light and variable wind becoming east around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 47. South wind 7 to 10 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 77. Southwest wind 11 to 18 mph, with gusts as high as 29 mph.
Tuesday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 59. Southwest wind 10 to 14 mph, with gusts as high as 22 mph.
Wednesday
Mostly sunny, with a high near 78. West southwest wind around 9 mph, with gusts as high as 15 mph.
Wednesday Night
Mostly clear, with a low around 58. South wind 8 to 10 mph, with gusts as high as 16 mph.
Thursday
Sunny, with a high near 80. Breezy.
Thursday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 61. Breezy. Chance of precipitation is 70%.
Friday
Showers likely. Mostly cloudy, with a high near 74. Chance of precipitation is 70%.
Friday Night
A chance of showers. Partly cloudy, with a low around 49.
Saturday
Mostly sunny, with a high near 68.
Saturday Night
Partly cloudy, with a low around 48.
Sunday
Mostly sunny, with a high near 68.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
9:36 pm CDT Apr 19, 2026
10pm CDT Apr 19, 2026-6pm CDT Apr 26, 2026
 
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