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 in Vicinity Light Rain

75°F

24°C

Humidity 94%
Wind Speed SW 13 mph
Barometer 30.07 in (1017.5 mb)
Dewpoint 73°F (23°C)
Visibility 9.00 mi
Last update 16 Aug 6:54 am CDT
Extended Forecast for

4 Miles N Forsyth IL

  • Today

    Today: A 50 percent chance of showers and thunderstorms, mainly after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 85. West wind 9 to 11 mph, with gusts as high as 18 mph.

    High: 85 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, with a low around 67. Northwest wind 5 to 8 mph, with gusts as high as 15 mph.

    Low: 67 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 81. North northwest wind 6 to 10 mph.

    High: 81 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 62. North wind around 6 mph becoming calm in the evening.

    Low: 62 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 84. Calm wind becoming west southwest 5 to 7 mph in the morning.

    High: 84 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers after 1am. Partly cloudy, with a low around 68. South wind 3 to 6 mph.

    Low: 68 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A 50 percent chance of showers before 1pm. Mostly cloudy, with a high near 80. West wind 6 to 9 mph becoming north in the afternoon.

    High: 80 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

Detailed Forecast

Today
A 50 percent chance of showers and thunderstorms, mainly after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 85. West wind 9 to 11 mph, with gusts as high as 18 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, with a low around 67. Northwest wind 5 to 8 mph, with gusts as high as 15 mph.
Monday
Mostly sunny, with a high near 81. North northwest wind 6 to 10 mph.
Monday Night
Mostly clear, with a low around 62. North wind around 6 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 84. Calm wind becoming west southwest 5 to 7 mph in the morning.
Tuesday Night
A 50 percent chance of showers after 1am. Partly cloudy, with a low around 68. South wind 3 to 6 mph.
Wednesday
A 50 percent chance of showers before 1pm. Mostly cloudy, with a high near 80. West wind 6 to 9 mph becoming north in the afternoon.
Wednesday Night
Partly cloudy, with a low around 62.
Thursday
Mostly sunny, with a high near 78.
Thursday Night
Partly cloudy, with a low around 60.
Friday
Mostly sunny, with a high near 79.
Friday Night
Partly cloudy, with a low around 62.
Saturday
Mostly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles N Forsyth IL
 39.97°N 88.96°W (Elev. 679 ft)
Last Update:
6:36 am CDT Aug 16, 2026
Forecast Valid:
7am CDT Aug 16, 2026-6pm CDT Aug 22, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation