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Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

72°F

22°C

Humidity 44%
Wind Speed N 6 mph
Barometer 29.92 in (1013.0 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 7 Oct 7:54 pm CDT
Extended Forecast for

Chestnut IL

  • Tonight

    Tonight: Mostly clear, with a low around 53. North northwest wind 5 to 8 mph becoming calm after midnight.

    Low: 53 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 79. Calm wind becoming north northwest 5 to 7 mph in the morning.

    High: 79 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 55. North wind around 5 mph becoming light and variable.

    Low: 55 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 84. South wind 7 to 13 mph, with gusts as high as 20 mph.

    High: 84 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Clear, with a low around 61. South southeast wind around 10 mph, with gusts as high as 17 mph.

    Low: 61 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 86. South wind 9 to 14 mph, with gusts as high as 18 mph.

    High: 86 °F

    Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 58. East southeast wind 6 to 9 mph, with gusts as high as 15 mph.

    Low: 58 °F

    Chance
    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 76.

    High: 76 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 53. North northwest wind 5 to 8 mph becoming calm after midnight.
Thursday
Sunny, with a high near 79. Calm wind becoming north northwest 5 to 7 mph in the morning.
Thursday Night
Mostly clear, with a low around 55. North wind around 5 mph becoming light and variable.
Friday
Mostly sunny, with a high near 84. South wind 7 to 13 mph, with gusts as high as 20 mph.
Friday Night
Clear, with a low around 61. South southeast wind around 10 mph, with gusts as high as 17 mph.
Saturday
Sunny, with a high near 86. South wind 9 to 14 mph, with gusts as high as 18 mph.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 58. East southeast wind 6 to 9 mph, with gusts as high as 15 mph.
Sunday
Partly sunny, with a high near 76.
Sunday Night
Partly cloudy, with a low around 57.
Columbus Day
Mostly sunny, with a high near 85.
Monday Night
Partly cloudy, with a low around 54.
Tuesday
Mostly sunny, with a high near 70.
Tuesday Night
Partly cloudy, with a low around 46.
Wednesday
Mostly sunny, with a high near 68.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Chestnut IL
 40.05°N 89.22°W (Elev. 627 ft)
Last Update:
7:36 pm CDT Oct 7, 2026
Forecast Valid:
8pm CDT Oct 7, 2026-6pm CDT Oct 14, 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