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.

Mostly Cloudy

80°F

27°C

Humidity 71%
Wind Speed N 7 mph
Barometer 29.98 in (1014.8 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 5 Jul 12:54 pm CDT
Extended Forecast for

Forsyth IL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 82. North wind around 9 mph.

    High: 82 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 64. North northeast wind 6 to 9 mph, with gusts as high as 15 mph.

    Low: 64 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 81. North northeast wind 7 to 13 mph.

    High: 81 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 62. North northeast wind 5 to 10 mph.

    Low: 62 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 83. Northeast wind 5 to 8 mph.

    High: 83 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 63. Northeast wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 85. Calm wind becoming south southwest 5 to 7 mph in the afternoon.

    High: 85 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.

    High: 87 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 82. North wind around 9 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 64. North northeast wind 6 to 9 mph, with gusts as high as 15 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 81. North northeast wind 7 to 13 mph.
Monday Night
Partly cloudy, with a low around 62. North northeast wind 5 to 10 mph.
Tuesday
Sunny, with a high near 83. Northeast wind 5 to 8 mph.
Tuesday Night
Mostly clear, with a low around 63. Northeast wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 85. Calm wind becoming south southwest 5 to 7 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 68.
Thursday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Thursday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 69. Chance of precipitation is 60%.
Friday
A chance of showers. Mostly cloudy, with a high near 83.
Friday Night
A chance of showers. Mostly cloudy, with a low around 65.
Saturday
Mostly sunny, with a high near 84.
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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:
12:36 pm CDT Jul 5, 2026
Forecast Valid:
1pm CDT Jul 5, 2026-6pm CDT Jul 11, 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