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

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Mostly Cloudy

46°F

8°C

Humidity 51%
Wind Speed S 7 mph
Barometer 30.10 in (1019.7 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 13 Feb 5:54 pm CST
Extended Forecast for

4 Miles N Forsyth IL

  • Tonight

    Tonight: Increasing clouds, with a low around 32. South wind 3 to 8 mph. Winds could gust as high as 16 mph.

    Low: 32 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 20 percent chance of rain after noon. Cloudy, with a high near 52. South wind 3 to 6 mph.

    High: 52 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: A 50 percent chance of rain. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 39. South southeast wind around 7 mph becoming east northeast after midnight.

    Low: 39 °F

    Chance Rain
    and Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 7am. Otherwise, mostly sunny, with a high near 58. East northeast wind 6 to 8 mph.

    High: 58 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36. North wind around 6 mph becoming south after midnight.

    Low: 36 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 60. South wind 6 to 13 mph, with gusts as high as 17 mph.

    High: 60 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42. South wind around 9 mph, with gusts as high as 15 mph.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 60.

    High: 60 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain before midnight. Mostly cloudy, with a low around 50.

    Low: 50 °F

    Chance Rain
    then Mostly
    Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 32. South wind 3 to 8 mph. Winds could gust as high as 16 mph.
Saturday
A 20 percent chance of rain after noon. Cloudy, with a high near 52. South wind 3 to 6 mph.
Saturday Night
A 50 percent chance of rain. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 39. South southeast wind around 7 mph becoming east northeast after midnight.
Sunday
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 58. East northeast wind 6 to 8 mph.
Sunday Night
Mostly clear, with a low around 36. North wind around 6 mph becoming south after midnight.
Washington's Birthday
Partly sunny, with a high near 60. South wind 6 to 13 mph, with gusts as high as 17 mph.
Monday Night
Mostly cloudy, with a low around 42. South wind around 9 mph, with gusts as high as 15 mph.
Tuesday
Mostly cloudy, with a high near 60.
Tuesday Night
A 30 percent chance of rain before midnight. Mostly cloudy, with a low around 50.
Wednesday
Partly sunny, with a high near 67. Breezy.
Wednesday Night
Mostly cloudy, with a low around 40.
Thursday
A chance of rain. Partly sunny, with a high near 59.
Thursday Night
A chance of rain. Partly cloudy, with a low around 35.
Friday
Mostly sunny, with a high near 49.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles N Forsyth IL
 39.97°N 88.96°W (Elev. 679 ft)
Last Update:
5:37 pm CST Feb 13, 2026
Forecast Valid:
6pm CST Feb 13, 2026-6pm CST Feb 20, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation