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.

A Few Clouds and Windy

82°F

28°C

Humidity 56%
Wind Speed S 26 G 38 mph
Barometer 29.80 in (1008.6 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 14 Apr 5:54 pm CDT
Extended Forecast for

Forsyth IL

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 67. South southwest wind 13 to 18 mph, with gusts as high as 29 mph.

    Low: 67 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 79. South southwest wind 13 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 79 °F

    Showers
    Likely then
    T-storms

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 61. South southwest wind 11 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 61 °F

    Showers

  • Thursday

    Thursday: Showers likely. Partly sunny, with a high near 75. Southwest wind 11 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 75 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 56. West southwest wind 6 to 9 mph becoming south after midnight.

    Low: 56 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 82. South wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 24 mph.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 56. South wind 15 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 56 °F

    Chance
    T-storms then
    Showers

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers. Partly sunny, with a high near 68. Breezy. Chance of precipitation is 60%.

    High: 68 °F

    Showers
    Likely and
    Breezy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 37.

    Low: 37 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 67. South southwest wind 13 to 18 mph, with gusts as high as 29 mph.
Wednesday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 79. South southwest wind 13 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
Showers and possibly a thunderstorm. Low around 61. South southwest wind 11 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Showers likely. Partly sunny, with a high near 75. Southwest wind 11 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Mostly clear, with a low around 56. West southwest wind 6 to 9 mph becoming south after midnight.
Friday
Mostly sunny, with a high near 82. South wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 24 mph.
Friday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 56. South wind 15 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers. Partly sunny, with a high near 68. Breezy. Chance of precipitation is 60%.
Saturday Night
Partly cloudy, with a low around 37.
Sunday
Sunny, with a high near 56. Breezy.
Sunday Night
Mostly clear, with a low around 36.
Monday
Sunny, with a high near 63.
Monday Night
Mostly clear, with a low around 43.
Tuesday
Sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Forsyth IL
 39.93°N 88.96°W (Elev. 650 ft)
Last Update:
4:46 pm CDT Apr 14, 2026
Forecast Valid:
6pm CDT Apr 14, 2026-6pm CDT Apr 21, 2026
 
Forecast Discussion
 
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Additional Resources

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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