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 Heavy Rain Fog

68°F

20°C

Humidity 96%
Wind Speed W 3 mph
Barometer 29.96 in (1014.2 mb)
Dewpoint 67°F (19°C)
Visibility 0.50 mi
Last update 25 Jun 2:54 am CDT
Extended Forecast for

Forsyth IL

Flood Watch June 25, 04:00pm until June 27, 01:00pm
Click here for hazard details and duration
Flood Watch

  • Overnight

    Overnight: A 30 percent chance of showers before 4am. Mostly cloudy, with a low around 64. West southwest wind around 5 mph.

    Low: 64 °F

    Chance
    Showers

  • Thursday

    Thursday: Mostly cloudy, with a high near 80. West southwest wind 5 to 7 mph.

    High: 80 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Light and variable wind becoming east 5 to 7 mph after midnight. Chance of precipitation is 50%.

    Low: 63 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Friday

    Friday: Showers, with thunderstorms also possible after 4pm. High near 75. East southeast wind 10 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

    High: 75 °F

    Showers

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 64. Southeast wind 6 to 11 mph becoming north in the evening. Winds could gust as high as 15 mph.

    Low: 64 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly cloudy, with a high near 82. East northeast wind around 6 mph becoming south southeast in the afternoon.

    High: 82 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68. East southeast wind 6 to 8 mph.

    Low: 68 °F

    Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of showers before 4am. Mostly cloudy, with a low around 64. West southwest wind around 5 mph.
Thursday
Mostly cloudy, with a high near 80. West southwest wind 5 to 7 mph.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Light and variable wind becoming east 5 to 7 mph after midnight. Chance of precipitation is 50%.
Friday
Showers, with thunderstorms also possible after 4pm. High near 75. East southeast wind 10 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
Friday Night
A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 64. Southeast wind 6 to 11 mph becoming north in the evening. Winds could gust as high as 15 mph.
Saturday
Mostly cloudy, with a high near 82. East northeast wind around 6 mph becoming south southeast in the afternoon.
Saturday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68. East southeast wind 6 to 8 mph.
Sunday
Mostly sunny, with a high near 90.
Sunday Night
Mostly clear, with a low around 73.
Monday
Sunny, with a high near 92.
Monday Night
Mostly clear, with a low around 74.
Tuesday
Sunny, with a high near 93.
Tuesday Night
Clear, with a low around 74.
Wednesday
Sunny, with a high near 93.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Forsyth IL
 39.93°N 88.96°W (Elev. 650 ft)
Last Update:
3:36 am CDT Jun 25, 2026
Forecast Valid:
3am CDT Jun 25, 2026-6pm CDT Jul 1, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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