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.

Thunderstorm Light Rain

60°F

16°C

Humidity 86%
Wind Speed W 10 mph
Barometer 29.70 in (1005.3 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 11 Mar 2:54 am CDT
Extended Forecast for

Forsyth IL

  • Overnight

    Overnight: Showers and thunderstorms before 4am, then showers and possibly a thunderstorm after 4am. Steady temperature around 64. Southwest wind around 18 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 64 °F

    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before 2pm, then a chance of showers. Temperature falling to around 41 by 3pm. Breezy, with a west southwest wind 16 to 24 mph becoming northwest in the afternoon. Winds could gust as high as 33 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 61 °F⇓

    Breezy.
    T-storms then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Mostly cloudy, then gradually becoming clear, with a low around 28. Blustery, with a northwest wind 16 to 21 mph decreasing to 8 to 13 mph after midnight. Winds could gust as high as 31 mph.

    Low: 28 °F

    Mostly Cloudy
    and Blustery
    then Clear

  • Thursday

    Thursday: Increasing clouds, with a high near 49. West wind 6 to 16 mph, with gusts as high as 22 mph.

    High: 49 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 41. Breezy, with a south wind 14 to 19 mph increasing to 23 to 28 mph after midnight. Winds could gust as high as 38 mph.

    Low: 41 °F

    Mostly Cloudy
    and Breezy

  • Friday

    Friday: Partly sunny, with a high near 54. Breezy, with a west wind 20 to 26 mph, with gusts as high as 36 mph.

    High: 54 °F

    Partly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 33. West northwest wind 6 to 10 mph becoming east northeast after midnight. Winds could gust as high as 16 mph.

    Low: 33 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 54.

    High: 54 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 44. Breezy.

    Low: 44 °F

    Mostly Cloudy
    then Chance
    Showers and
    Breezy

Detailed Forecast

Overnight
Showers and thunderstorms before 4am, then showers and possibly a thunderstorm after 4am. Steady temperature around 64. Southwest wind around 18 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
Showers and possibly a thunderstorm before 2pm, then a chance of showers. Temperature falling to around 41 by 3pm. Breezy, with a west southwest wind 16 to 24 mph becoming northwest in the afternoon. Winds could gust as high as 33 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday Night
Mostly cloudy, then gradually becoming clear, with a low around 28. Blustery, with a northwest wind 16 to 21 mph decreasing to 8 to 13 mph after midnight. Winds could gust as high as 31 mph.
Thursday
Increasing clouds, with a high near 49. West wind 6 to 16 mph, with gusts as high as 22 mph.
Thursday Night
Mostly cloudy, with a low around 41. Breezy, with a south wind 14 to 19 mph increasing to 23 to 28 mph after midnight. Winds could gust as high as 38 mph.
Friday
Partly sunny, with a high near 54. Breezy, with a west wind 20 to 26 mph, with gusts as high as 36 mph.
Friday Night
Mostly cloudy, with a low around 33. West northwest wind 6 to 10 mph becoming east northeast after midnight. Winds could gust as high as 16 mph.
Saturday
Mostly cloudy, with a high near 54.
Saturday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 44. Breezy.
Sunday
Showers. High near 59. Windy. Chance of precipitation is 90%.
Sunday Night
A chance of rain and snow showers. Mostly cloudy, with a low around 21. Blustery.
Monday
Mostly sunny, with a high near 31. Blustery.
Monday Night
Partly cloudy, with a low around 15.
Tuesday
Partly sunny, with a high near 35.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Forsyth IL
 39.93°N 88.96°W (Elev. 650 ft)
Last Update:
3:07 am CDT Mar 11, 2026
Forecast Valid:
3am CDT Mar 11, 2026-6pm CDT Mar 17, 2026
 
Forecast Discussion
 
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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