Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

49°F

9°C

Humidity 46%
Wind Speed N 12 mph
Barometer 30.21 in (1023.4 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 19 Apr 8:54 pm CDT
Extended Forecast for

2 Miles ENE Harristown IL

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

    Tonight: Widespread frost, mainly after 5am.  Otherwise, mostly clear, with a low around 33. North wind 5 to 9 mph becoming light. Winds could gust as high as 17 mph.

    Low: 33 °F

    Mostly Clear
    then Frost

  • Monday

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

    High: 61 °F

    Frost then
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 46. South southeast wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 46 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77. Breezy, with a southwest wind 13 to 21 mph, with gusts as high as 28 mph.

    High: 77 °F

    Mostly Sunny
    then Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: 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

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78. West southwest wind around 10 mph, with gusts as high as 16 mph.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. South wind 9 to 11 mph, with gusts as high as 18 mph.

    Low: 57 °F

    Mostly Clear

  • Thursday

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

    High: 80 °F

    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

    Breezy.
    Chance
    Showers then
    Showers
    Likely

Detailed Forecast

Tonight
Widespread frost, mainly after 5am. Otherwise, mostly clear, with a low around 33. North wind 5 to 9 mph becoming light. Winds could gust as high as 17 mph.
Monday
Widespread frost, mainly before 7am. Otherwise, sunny, with a high near 61. Northeast wind around 6 mph becoming south in the afternoon.
Monday Night
Mostly clear, with a low around 46. 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 13 to 21 mph, with gusts as high as 28 mph.
Tuesday Night
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 10 mph, with gusts as high as 16 mph.
Wednesday Night
Mostly clear, with a low around 57. South wind 9 to 11 mph, with gusts as high as 18 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, mainly before 1pm. 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:
2 Miles ENE Harristown IL
 39.84°N 89.03°W (Elev. 666 ft)
9:36 pm CDT Apr 19, 2026
9pm CDT Apr 19, 2026-6pm CDT Apr 26, 2026
 
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