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.

Fair

52°F

11°C

Humidity 66%
Wind Speed NE 17 mph
Barometer 30.21 in (1023.1 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 20 May 10:54 pm CDT
Extended Forecast for

3 Miles WSW Forsyth IL

  • Overnight

    Overnight: Partly cloudy, with a low around 47. Northeast wind around 11 mph, with gusts as high as 21 mph.

    Low: 47 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 69. East wind 13 to 15 mph, with gusts as high as 22 mph.

    High: 69 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 52. East wind around 13 mph, with gusts as high as 20 mph.

    Low: 52 °F

    Mostly Cloudy

  • Friday

    Friday: Showers likely, mainly after 1pm. Mostly cloudy, with a high near 68. East wind 13 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    High: 68 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday Night

    Friday Night: Showers likely before 1am. Mostly cloudy, with a low around 57. East northeast wind 7 to 11 mph becoming west southwest after midnight. Winds could gust as high as 16 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 57 °F

    Showers
    Likely

  • Saturday

    Saturday: Mostly cloudy, with a high near 77. West southwest wind 8 to 11 mph, with gusts as high as 15 mph.

    High: 77 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 58. Southwest wind around 6 mph becoming light and variable.

    Low: 58 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers. Mostly cloudy, with a high near 78.

    High: 78 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 58.

    Low: 58 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 47. Northeast wind around 11 mph, with gusts as high as 21 mph.
Thursday
Mostly sunny, with a high near 69. East wind 13 to 15 mph, with gusts as high as 22 mph.
Thursday Night
Mostly cloudy, with a low around 52. East wind around 13 mph, with gusts as high as 20 mph.
Friday
Showers likely, mainly after 1pm. Mostly cloudy, with a high near 68. East wind 13 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
Showers likely before 1am. Mostly cloudy, with a low around 57. East northeast wind 7 to 11 mph becoming west southwest after midnight. Winds could gust as high as 16 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Mostly cloudy, with a high near 77. West southwest wind 8 to 11 mph, with gusts as high as 15 mph.
Saturday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 58. Southwest wind around 6 mph becoming light and variable.
Sunday
A 30 percent chance of showers. Mostly cloudy, with a high near 78.
Sunday Night
Mostly cloudy, with a low around 58.
Memorial Day
Mostly cloudy, with a high near 79.
Monday Night
A chance of showers. Mostly cloudy, with a low around 61.
Tuesday
A chance of showers. Partly sunny, with a high near 81.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 82.
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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:
10:36 pm CDT May 20, 2026
Forecast Valid:
12am CDT May 21, 2026-6pm CDT May 27, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation