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.

Fair

61°F

16°C

Humidity 87%
Wind Speed SW 18 G 26 mph
Barometer 29.56 in (1000.7 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 9 Jan 1:54 am CST
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: A slight chance of rain and thunderstorms before 3am, then a slight chance of rain between 3am and 5am. Mostly clear early, then becoming cloudy, with a low around 43. Breezy, with a southwest wind 18 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

    Low: 43 °F

    Slight Chance
    T-storms and
    Breezy

  • Friday

    Friday: Cloudy, with a high near 49. West wind 13 to 18 mph becoming north 5 to 10 mph in the afternoon. Winds could gust as high as 28 mph.

    High: 49 °F

    Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 36. Light east northeast wind.

    Low: 36 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 40 percent chance of rain before noon. Cloudy, then gradually becoming mostly sunny, with a high near 42. West northwest wind 5 to 14 mph, with gusts as high as 23 mph.

    High: 42 °F

    Chance Rain
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 20. West northwest wind 13 to 18 mph, with gusts as high as 25 mph.

    Low: 20 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 31. West northwest wind 13 to 18 mph decreasing to 7 to 12 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 31 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 23. West wind 6 to 9 mph becoming south southwest after midnight. Winds could gust as high as 16 mph.

    Low: 23 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 43.

    High: 43 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy

Detailed Forecast

Overnight
A slight chance of rain and thunderstorms before 3am, then a slight chance of rain between 3am and 5am. Mostly clear early, then becoming cloudy, with a low around 43. Breezy, with a southwest wind 18 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
Friday
Cloudy, with a high near 49. West wind 13 to 18 mph becoming north 5 to 10 mph in the afternoon. Winds could gust as high as 28 mph.
Friday Night
Mostly cloudy, with a low around 36. Light east northeast wind.
Saturday
A 40 percent chance of rain before noon. Cloudy, then gradually becoming mostly sunny, with a high near 42. West northwest wind 5 to 14 mph, with gusts as high as 23 mph.
Saturday Night
Mostly cloudy, with a low around 20. West northwest wind 13 to 18 mph, with gusts as high as 25 mph.
Sunday
Mostly sunny, with a high near 31. West northwest wind 13 to 18 mph decreasing to 7 to 12 mph in the afternoon. Winds could gust as high as 25 mph.
Sunday Night
Mostly clear, with a low around 23. West wind 6 to 9 mph becoming south southwest after midnight. Winds could gust as high as 16 mph.
Monday
Mostly sunny, with a high near 43.
Monday Night
Partly cloudy, with a low around 33.
Tuesday
Partly sunny, with a high near 49.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 33.
Wednesday
Mostly cloudy, with a high near 38.
Wednesday Night
Mostly cloudy, with a low around 21.
Thursday
Partly sunny, with a high near 33.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
11:37 pm CST Jan 8, 2026
Forecast Valid:
2am CST Jan 9, 2026-6pm CST Jan 15, 2026
 
Forecast Discussion
 
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Additional Resources

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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