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

66°F

19°C

Humidity 68%
Wind Speed S 17 mph
Barometer 29.67 in (1004.0 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 22 Mar 2:54 am CDT
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: Mostly clear, with a low around 62. South southwest wind 11 to 13 mph, with gusts as high as 21 mph.

    Low: 62 °F

    Mostly Clear

  • Sunday

    Sunday: A 10 percent chance of showers after 5pm. Increasing clouds, with a high near 81. Breezy, with a west wind 10 to 15 mph becoming north 16 to 21 mph in the afternoon. Winds could gust as high as 31 mph.

    High: 81 °F

    Mostly Sunny
    then Slight
    Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 32. Breezy, with a north wind 13 to 21 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.

    Low: 32 °F

    Slight Chance
    T-storms and
    Breezy then
    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 52. North northeast wind 7 to 10 mph, with gusts as high as 18 mph.

    High: 52 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 34. East southeast wind around 6 mph.

    Low: 34 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 61. South wind 6 to 8 mph.

    High: 61 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 43. South southeast wind around 7 mph.

    Low: 43 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 69.

    High: 69 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 62. South southwest wind 11 to 13 mph, with gusts as high as 21 mph.
Sunday
A 10 percent chance of showers after 5pm. Increasing clouds, with a high near 81. Breezy, with a west wind 10 to 15 mph becoming north 16 to 21 mph in the afternoon. Winds could gust as high as 31 mph.
Sunday Night
A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 32. Breezy, with a north wind 13 to 21 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 52. North northeast wind 7 to 10 mph, with gusts as high as 18 mph.
Monday Night
Mostly cloudy, with a low around 34. East southeast wind around 6 mph.
Tuesday
Mostly sunny, with a high near 61. South wind 6 to 8 mph.
Tuesday Night
Mostly cloudy, with a low around 43. South southeast wind around 7 mph.
Wednesday
Partly sunny, with a high near 69.
Wednesday Night
Partly cloudy, with a low around 55.
Thursday
A 30 percent chance of rain and thunderstorms after 1pm. Mostly sunny, with a high near 81.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 37.
Friday
A chance of rain. Partly sunny, with a high near 49.
Friday Night
Mostly clear, with a low around 29.
Saturday
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:
1:26 am CDT Mar 22, 2026
Forecast Valid:
3am CDT Mar 22, 2026-6pm CDT Mar 28, 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