National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Overcast

64°F

18°C

Humidity 65%
Wind Speed E 17 mph
Barometer 30.00 in (1015.6 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 22 May 11:54 am CDT
Extended Forecast for

3 Miles WSW Forsyth IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 69. East wind around 11 mph, with gusts as high as 18 mph.

    High: 69 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 59. East wind 5 to 10 mph, with gusts as high as 16 mph.

    Low: 59 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 78. West wind 5 to 7 mph.

    High: 78 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 50 percent chance of showers after 1am. Mostly cloudy, with a low around 59. West wind around 5 mph becoming light and variable in the evening.

    Low: 59 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A 50 percent chance of showers. Mostly cloudy, with a high near 79. South wind around 6 mph becoming northeast in the afternoon.

    High: 79 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 58. Light east wind.

    Low: 58 °F

    Partly Cloudy

  • Memorial Day

    Memorial Day: Partly sunny, with a high near 81. East wind 5 to 7 mph.

    High: 81 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 61.

    Low: 61 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 83.

    High: 83 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 69. East wind around 11 mph, with gusts as high as 18 mph.
Tonight
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 59. East wind 5 to 10 mph, with gusts as high as 16 mph.
Saturday
Partly sunny, with a high near 78. West wind 5 to 7 mph.
Saturday Night
A 50 percent chance of showers after 1am. Mostly cloudy, with a low around 59. West wind around 5 mph becoming light and variable in the evening.
Sunday
A 50 percent chance of showers. Mostly cloudy, with a high near 79. South wind around 6 mph becoming northeast in the afternoon.
Sunday Night
Partly cloudy, with a low around 58. Light east wind.
Memorial Day
Partly sunny, with a high near 81. East wind 5 to 7 mph.
Monday Night
Mostly cloudy, with a low around 61.
Tuesday
Partly sunny, with a high near 83.
Tuesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 64.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 81.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Forsyth IL
 39.89°N 89.02°W (Elev. 656 ft)
Last Update:
10:46 am CDT May 22, 2026
Forecast Valid:
12pm CDT May 22, 2026-6pm CDT May 28, 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