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

46°F

8°C

Humidity 77%
Wind Speed W 5 mph
Barometer 29.81 in (1009.2 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 8 Nov 1:54 am CST
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: Partly cloudy, with a low around 40. Northwest wind 3 to 5 mph.

    Low: 40 °F

    Partly Cloudy

  • Saturday

    Saturday: A 40 percent chance of rain after 3pm. Mostly cloudy, with a high near 57. Calm wind becoming west around 6 mph in the afternoon.

    High: 57 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday Night

    Saturday Night: Rain before 4am, then a slight chance of snow. Low around 32. Breezy, with an east wind 8 to 13 mph becoming north northwest 15 to 20 mph after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.

    Low: 32 °F

    Rain then
    Chance
    Rain/Snow and
    Breezy

  • Sunday

    Sunday: Partly sunny, with a high near 38. Breezy, with a northwest wind 18 to 21 mph, with gusts as high as 33 mph.

    High: 38 °F

    Partly Sunny
    and Breezy

  • Sunday Night

    Sunday Night: A 30 percent chance of snow showers after midnight. Partly cloudy, with a low around 23. Northwest wind 14 to 17 mph, with gusts as high as 24 mph.

    Low: 23 °F

    Partly Cloudy
    then Chance
    Snow Showers

  • Monday

    Monday: Sunny, with a high near 38. Northwest wind 13 to 18 mph, with gusts as high as 24 mph.

    High: 38 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 23. West northwest wind 6 to 10 mph becoming southwest after midnight.

    Low: 23 °F

    Partly Cloudy

  • Veterans Day

    Veterans Day: Partly sunny, with a high near 50.

    High: 50 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 40. Northwest wind 3 to 5 mph.
Saturday
A 40 percent chance of rain after 3pm. Mostly cloudy, with a high near 57. Calm wind becoming west around 6 mph in the afternoon.
Saturday Night
Rain before 4am, then a slight chance of snow. Low around 32. Breezy, with an east wind 8 to 13 mph becoming north northwest 15 to 20 mph after midnight. Winds could gust as high as 29 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.
Sunday
Partly sunny, with a high near 38. Breezy, with a northwest wind 18 to 21 mph, with gusts as high as 33 mph.
Sunday Night
A 30 percent chance of snow showers after midnight. Partly cloudy, with a low around 23. Northwest wind 14 to 17 mph, with gusts as high as 24 mph.
Monday
Sunny, with a high near 38. Northwest wind 13 to 18 mph, with gusts as high as 24 mph.
Monday Night
Partly cloudy, with a low around 23. West northwest wind 6 to 10 mph becoming southwest after midnight.
Veterans Day
Partly sunny, with a high near 50.
Tuesday Night
Mostly clear, with a low around 37.
Wednesday
Sunny, with a high near 59.
Wednesday Night
Mostly clear, with a low around 33.
Thursday
Sunny, with a high near 58.
Thursday Night
Partly cloudy, with a low around 38.
Friday
Mostly sunny, with a high near 63.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.86°N 88.94°W (Elev. 682 ft)
Last Update:
1:55 am CST Nov 8, 2025
Forecast Valid:
2am CST Nov 8, 2025-6pm CST Nov 14, 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