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

38°F

3°C

Humidity 43%
Wind Speed NW 6 mph
Barometer 30.04 in (1017.5 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 16 Nov 11:54 pm CST
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: Mostly clear, with a low around 29. North northwest wind around 5 mph becoming calm.

    Low: 29 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 55. Light and variable wind becoming southeast 5 to 8 mph in the morning.

    High: 55 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Rain likely, then showers and possibly a thunderstorm after 9pm. Low around 43. Southeast wind 9 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 43 °F

    Showers

  • Tuesday

    Tuesday: A chance of showers before 9am, then a chance of rain after 9am. Mostly cloudy, with a high near 58. Southeast wind 8 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 50%.

    High: 58 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 43. East northeast wind 6 to 8 mph.

    Low: 43 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 58. East northeast wind around 6 mph becoming calm in the afternoon.

    High: 58 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 44. Calm wind becoming east around 5 mph after midnight.

    Low: 44 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday

    Thursday: Rain. High near 63. Chance of precipitation is 80%.

    High: 63 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.

    Low: 52 °F

    Rain Likely

Detailed Forecast

Overnight
Mostly clear, with a low around 29. North northwest wind around 5 mph becoming calm.
Monday
Mostly sunny, with a high near 55. Light and variable wind becoming southeast 5 to 8 mph in the morning.
Monday Night
Rain likely, then showers and possibly a thunderstorm after 9pm. Low around 43. Southeast wind 9 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday
A chance of showers before 9am, then a chance of rain after 9am. Mostly cloudy, with a high near 58. Southeast wind 8 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 50%.
Tuesday Night
Increasing clouds, with a low around 43. East northeast wind 6 to 8 mph.
Wednesday
Mostly cloudy, with a high near 58. East northeast wind around 6 mph becoming calm in the afternoon.
Wednesday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 44. Calm wind becoming east around 5 mph after midnight.
Thursday
Rain. High near 63. Chance of precipitation is 80%.
Thursday Night
Rain likely. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.
Friday
A 50 percent chance of rain. Partly sunny, with a high near 64.
Friday Night
A chance of rain. Mostly cloudy, with a low around 41.
Saturday
Partly sunny, with a high near 53.
Saturday Night
Partly cloudy, with a low around 36.
Sunday
Mostly sunny, with a high near 55.
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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:
12:36 am CST Nov 17, 2025
Forecast Valid:
12am CST Nov 17, 2025-6pm CST Nov 23, 2025
 
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