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.

Fair

37°F

3°C

Humidity 46%
Wind Speed W 15 G 23 mph
Barometer 30.16 in (1021.9 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 21 Feb 1:54 pm CST
Extended Forecast for

4 Miles N Forsyth IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 37. West northwest wind 13 to 15 mph, with gusts as high as 20 mph.

    High: 37 °F

    Sunny

  • Tonight

    Tonight: Scattered flurries after midnight. Increasing clouds, with a low around 18. Wind chill values between 5 and 15. Northwest wind 11 to 18 mph, with gusts as high as 28 mph.

    Low: 18 °F

    Scattered
    Flurries

  • Sunday

    Sunday: Mostly cloudy, with a high near 28. Wind chill values between 1 and 11. Blustery, with a northwest wind 20 to 23 mph, with gusts as high as 33 mph.

    High: 28 °F

    Mostly Cloudy
    and Blustery

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 15. Wind chill values between -1 and 9. Blustery, with a northwest wind 17 to 20 mph, with gusts as high as 28 mph.

    Low: 15 °F

    Mostly Cloudy
    and Blustery
    then Partly
    Cloudy

  • Monday

    Monday: Sunny, with a high near 31. North northwest wind 10 to 18 mph, with gusts as high as 25 mph.

    High: 31 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 17. Northwest wind 5 to 8 mph becoming light and variable.

    Low: 17 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Partly sunny, with a high near 47. Breezy, with a south wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 29 mph.

    High: 47 °F

    Partly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 34.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 51.

    High: 51 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 37. West northwest wind 13 to 15 mph, with gusts as high as 20 mph.
Tonight
Scattered flurries after midnight. Increasing clouds, with a low around 18. Wind chill values between 5 and 15. Northwest wind 11 to 18 mph, with gusts as high as 28 mph.
Sunday
Mostly cloudy, with a high near 28. Wind chill values between 1 and 11. Blustery, with a northwest wind 20 to 23 mph, with gusts as high as 33 mph.
Sunday Night
Mostly cloudy, with a low around 15. Wind chill values between -1 and 9. Blustery, with a northwest wind 17 to 20 mph, with gusts as high as 28 mph.
Monday
Sunny, with a high near 31. North northwest wind 10 to 18 mph, with gusts as high as 25 mph.
Monday Night
Increasing clouds, with a low around 17. Northwest wind 5 to 8 mph becoming light and variable.
Tuesday
Partly sunny, with a high near 47. Breezy, with a south wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 29 mph.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Partly sunny, with a high near 51.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 28.
Thursday
A chance of rain. Mostly sunny, with a high near 43.
Thursday Night
Mostly clear, with a low around 25.
Friday
Sunny, with a high near 55.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles N Forsyth IL
 39.97°N 88.96°W (Elev. 679 ft)
Last Update:
1:36 pm CST Feb 21, 2026
Forecast Valid:
2pm CST Feb 21, 2026-6pm CST Feb 27, 2026
 
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