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

51°F

11°C

Humidity 52%
Wind Speed NW 15 mph
Barometer 30.26 in (1024.9 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 5 Apr 12:54 pm CDT
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 54. West northwest wind around 15 mph, with gusts as high as 24 mph.

    High: 54 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 39. West wind 6 to 9 mph, with gusts as high as 16 mph.

    Low: 39 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 55. Northwest wind 9 to 14 mph, with gusts as high as 22 mph.

    High: 55 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 31. Northwest wind around 11 mph becoming north northeast after midnight. Winds could gust as high as 18 mph.

    Low: 31 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 48. East southeast wind around 9 mph, with gusts as high as 15 mph.

    High: 48 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38. East southeast wind 8 to 10 mph, with gusts as high as 20 mph.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 69. South wind 11 to 17 mph, with gusts as high as 28 mph.

    High: 69 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers after 1pm. Partly sunny, with a high near 73.

    High: 73 °F

    Partly Sunny
    then Chance
    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 54. West northwest wind around 15 mph, with gusts as high as 24 mph.
Tonight
Mostly clear, with a low around 39. West wind 6 to 9 mph, with gusts as high as 16 mph.
Monday
Mostly sunny, with a high near 55. Northwest wind 9 to 14 mph, with gusts as high as 22 mph.
Monday Night
Mostly cloudy, with a low around 31. Northwest wind around 11 mph becoming north northeast after midnight. Winds could gust as high as 18 mph.
Tuesday
Partly sunny, with a high near 48. East southeast wind around 9 mph, with gusts as high as 15 mph.
Tuesday Night
Mostly cloudy, with a low around 38. East southeast wind 8 to 10 mph, with gusts as high as 20 mph.
Wednesday
Partly sunny, with a high near 69. South wind 11 to 17 mph, with gusts as high as 28 mph.
Wednesday Night
Partly cloudy, with a low around 52.
Thursday
A 30 percent chance of showers after 1pm. Partly sunny, with a high near 73.
Thursday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 53.
Friday
A chance of showers. Mostly cloudy, with a high near 71.
Friday Night
A chance of showers. Mostly cloudy, with a low around 52.
Saturday
A chance of showers. Mostly cloudy, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
1:06 pm CDT Apr 5, 2026
Forecast Valid:
1pm CDT Apr 5, 2026-6pm CDT Apr 11, 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