Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

41°F

5°C

Humidity 65%
Wind Speed SW 5 mph
Barometer 30.16 in (1021.7 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 19 Apr 12:54 am CDT
Extended Forecast for

2 Miles ENE Harristown IL

Frost Advisory April 20, 01:00am until April 20, 08:00am
Frost Advisory April 19, 01:48am until April 19, 08:00am
Click here for hazard details and duration
Frost Advisory
Frost Advisory
  •  
    Frost Advisory April 19, 01:48am until April 19, 08:00am

    NOW until 8:00am Sun

    Frost Advisory

  • Overnight

    Low: 36 °F

    Areas Frost

  • Sunday

    Sunday: Areas of frost before 8am.  Otherwise, increasing clouds, with a high near 60. Breezy, with a west wind 8 to 13 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 60 °F

    Areas Frost
    then Mostly
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Widespread frost, mainly after 5am.  Otherwise, mostly clear, with a low around 33. North northeast wind 5 to 14 mph, with gusts as high as 21 mph.

    Low: 33 °F

    Mostly Clear
    then Frost

  • Monday

    Monday: Areas of frost before 8am.  Otherwise, sunny, with a high near 61. Northeast wind 5 to 7 mph becoming south in the afternoon.

    High: 61 °F

    Areas Frost
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 47. South wind 8 to 14 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 14 to 20 mph, with gusts as high as 29 mph.

    High: 77 °F

    Mostly Sunny
    then Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 57. West southwest wind 10 to 14 mph, with gusts as high as 21 mph.

    Low: 57 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

Detailed Forecast

Overnight
Areas of frost after 3am. Otherwise, mostly clear, with a low around 36. Southwest wind around 7 mph.
Sunday
Areas of frost before 8am. Otherwise, increasing clouds, with a high near 60. Breezy, with a west wind 8 to 13 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 30 mph.
Sunday Night
Widespread frost, mainly after 5am. Otherwise, mostly clear, with a low around 33. North northeast wind 5 to 14 mph, with gusts as high as 21 mph.
Monday
Areas of frost before 8am. Otherwise, sunny, with a high near 61. Northeast wind 5 to 7 mph becoming south in the afternoon.
Monday Night
Mostly clear, with a low around 47. South wind 8 to 14 mph, with gusts as high as 21 mph.
Tuesday
Mostly sunny, with a high near 77. Breezy, with a southwest wind 14 to 20 mph, with gusts as high as 29 mph.
Tuesday Night
Partly cloudy, with a low around 57. West southwest wind 10 to 14 mph, with gusts as high as 21 mph.
Wednesday
Mostly sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Mostly sunny, with a high near 81. Breezy.
Thursday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 62.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 73.
Friday Night
Showers likely. Mostly cloudy, with a low around 48.
Saturday
Mostly sunny, with a high near 67.
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)
1:26 am CDT Apr 19, 2026
1am CDT Apr 19, 2026-6pm CDT Apr 25, 2026
 
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