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

75°F

24°C

Humidity 90%
Wind Speed SE 6 mph
Barometer 29.89 in (1011.8 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 19 Sep 11:54 pm CDT
Extended Forecast for

Forsyth IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 70. Southwest wind around 7 mph.

    Low: 70 °F

    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. North northeast wind 5 to 11 mph becoming west in the afternoon. Chance of precipitation is 50%.

    High: 84 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. East northeast wind 13 to 16 mph. Chance of precipitation is 50%.

    Low: 61 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Monday

    Monday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 70. East northeast wind 15 to 17 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 70 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 55. Northeast wind 13 to 15 mph, with gusts as high as 20 mph.

    Low: 55 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 66. Northeast wind around 17 mph, with gusts as high as 21 mph.

    High: 66 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 51. North northeast wind 8 to 15 mph.

    Low: 51 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 69.

    High: 69 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 51.

    Low: 51 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 70. Southwest wind around 7 mph.
Sunday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. North northeast wind 5 to 11 mph becoming west in the afternoon. Chance of precipitation is 50%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. East northeast wind 13 to 16 mph. Chance of precipitation is 50%.
Monday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 70. East northeast wind 15 to 17 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 55. Northeast wind 13 to 15 mph, with gusts as high as 20 mph.
Tuesday
Mostly cloudy, with a high near 66. Northeast wind around 17 mph, with gusts as high as 21 mph.
Tuesday Night
Mostly cloudy, with a low around 51. North northeast wind 8 to 15 mph.
Wednesday
Mostly sunny, with a high near 69.
Wednesday Night
Partly cloudy, with a low around 51.
Thursday
Mostly sunny, with a high near 70.
Thursday Night
Mostly cloudy, with a low around 54.
Friday
Partly sunny, with a high near 73.
Friday Night
Partly cloudy, with a low around 51.
Saturday
Mostly sunny, with a high near 75.
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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:
1:26 am CDT Sep 20, 2026
Forecast Valid:
2am CDT Sep 20, 2026-6pm CDT Sep 26, 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