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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

3 Miles WSW Forsyth 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: 33 °F

    Frost

  • Monday

    Monday: Widespread frost, mainly before 7am. Otherwise, sunny, with a high near 62. Light and variable wind becoming south 5 to 7 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 13 mph, with gusts as high as 21 mph.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 78. Breezy, with a southwest wind 13 to 21 mph, with gusts as high as 30 mph.

    High: 78 °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 58. Southwest wind 13 to 15 mph, with gusts as high as 24 mph.

    Low: 58 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78. West southwest wind around 11 mph, with gusts as high as 17 mph.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 56. South wind 8 to 10 mph, with gusts as high as 17 mph.

    Low: 56 °F

    Mostly Clear

  • Thursday

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

    High: 80 °F

    Mostly Sunny
    and Breezy

Detailed Forecast

Overnight
Widespread frost, mainly after 5am. Otherwise, clear, with a low around 33. Northeast wind around 5 mph.
Monday
Widespread frost, mainly before 7am. Otherwise, sunny, with a high near 62. Light and variable wind becoming south 5 to 7 mph in the afternoon.
Monday Night
Mostly clear, with a low around 47. South southeast wind 7 to 13 mph, with gusts as high as 21 mph.
Tuesday
Mostly sunny, with a high near 78. Breezy, with a southwest wind 13 to 21 mph, with gusts as high as 30 mph.
Tuesday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 58. Southwest wind 13 to 15 mph, with gusts as high as 24 mph.
Wednesday
Mostly sunny, with a high near 78. West southwest wind around 11 mph, with gusts as high as 17 mph.
Wednesday Night
Mostly clear, with a low around 56. South wind 8 to 10 mph, with gusts as high as 17 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 61. Breezy. 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 49.
Saturday
Mostly sunny, with a high near 70.
Saturday Night
Partly cloudy, with a low around 48.
Sunday
Mostly sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Forsyth IL
 39.89°N 89.02°W (Elev. 656 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

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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