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.

Overcast

32°F

0°C

Humidity 79%
Wind Speed N 9 mph
Barometer 30.35 in (1028.4 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 23 Mar 7:54 am CDT
Extended Forecast for

Decatur IL

  • Today

    Today: Mostly sunny, with a high near 51. North northeast wind 10 to 13 mph, with gusts as high as 21 mph.

    High: 51 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 32. Northeast wind 6 to 8 mph becoming east southeast after midnight. Winds could gust as high as 15 mph.

    Low: 32 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 58. South wind 6 to 10 mph, with gusts as high as 16 mph.

    High: 58 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 40. Southeast wind around 7 mph.

    Low: 40 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 71. South southwest wind 7 to 13 mph, with gusts as high as 20 mph.

    High: 71 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 56. South southwest wind around 11 mph, with gusts as high as 18 mph.

    Low: 56 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84. Southwest wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 84 °F

    Sunny then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Rain and possibly a thunderstorm before 1am, then a chance of rain. Low around 37. Breezy. Chance of precipitation is 80%.

    Low: 37 °F

    Rain and
    Breezy

  • Friday

    Friday: Partly sunny, with a high near 48.

    High: 48 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 51. North northeast wind 10 to 13 mph, with gusts as high as 21 mph.
Tonight
Mostly cloudy, with a low around 32. Northeast wind 6 to 8 mph becoming east southeast after midnight. Winds could gust as high as 15 mph.
Tuesday
Mostly sunny, with a high near 58. South wind 6 to 10 mph, with gusts as high as 16 mph.
Tuesday Night
Partly cloudy, with a low around 40. Southeast wind around 7 mph.
Wednesday
Partly sunny, with a high near 71. South southwest wind 7 to 13 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly cloudy, with a low around 56. South southwest wind around 11 mph, with gusts as high as 18 mph.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84. Southwest wind 10 to 15 mph, with gusts as high as 24 mph.
Thursday Night
Rain and possibly a thunderstorm before 1am, then a chance of rain. Low around 37. Breezy. Chance of precipitation is 80%.
Friday
Partly sunny, with a high near 48.
Friday Night
Mostly clear, with a low around 28.
Saturday
Sunny, with a high near 54.
Saturday Night
Partly cloudy, with a low around 34.
Sunday
Partly sunny, with a high near 60.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.86°N 88.97°W (Elev. 676 ft)
Last Update:
7:35 am CDT Mar 23, 2026
Forecast Valid:
8am CDT Mar 23, 2026-6pm CDT Mar 29, 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