National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

73°F

23°C

Humidity 62%
Wind Speed Calm
Barometer 30.07 in (1018.1 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 24 Aug 6:54 pm CDT
Extended Forecast for

Forsyth IL

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, mostly clear, with a low around 57. East wind 3 to 5 mph.

    Low: 57 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, sunny, with a high near 82. Southeast wind 3 to 6 mph.

    High: 82 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 63. Southeast wind around 6 mph.

    Low: 63 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 86. South wind 6 to 11 mph becoming west southwest in the afternoon. Winds could gust as high as 16 mph.

    High: 86 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers before 1am. Mostly clear, with a low around 63. West northwest wind 3 to 7 mph.

    Low: 63 °F

    Chance
    Showers

  • Thursday

    Thursday: Sunny, with a high near 84. Northwest wind 5 to 10 mph.

    High: 84 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 62. North wind 5 to 8 mph becoming calm in the evening.

    Low: 62 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 3am. Otherwise, mostly clear, with a low around 57. East wind 3 to 5 mph.
Tuesday
Patchy fog before 8am. Otherwise, sunny, with a high near 82. Southeast wind 3 to 6 mph.
Tuesday Night
Partly cloudy, with a low around 63. Southeast wind around 6 mph.
Wednesday
Mostly sunny, with a high near 86. South wind 6 to 11 mph becoming west southwest in the afternoon. Winds could gust as high as 16 mph.
Wednesday Night
A 30 percent chance of showers before 1am. Mostly clear, with a low around 63. West northwest wind 3 to 7 mph.
Thursday
Sunny, with a high near 84. Northwest wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 62. North wind 5 to 8 mph becoming calm in the evening.
Friday
Sunny, with a high near 84.
Friday Night
Mostly clear, with a low around 62.
Saturday
Mostly sunny, with a high near 85.
Saturday Night
Partly cloudy, with a low around 67.
Sunday
Mostly sunny, with a high near 90.
Sunday Night
Partly cloudy, with a low around 72.
Monday
Mostly sunny, with a high near 90.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Forsyth IL
 39.93°N 88.96°W (Elev. 650 ft)
Last Update:
7:35 pm CDT Aug 24, 2026
Forecast Valid:
7pm CDT Aug 24, 2026-6pm CDT Aug 31, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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