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

53°F

12°C

Humidity 32%
Wind Speed Vrbl 3 mph
Barometer 30.35 in (1027.9 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Last update 20 Apr 11:54 am CDT
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 62. South wind 3 to 6 mph.

    High: 62 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 48. South wind 6 to 11 mph, with gusts as high as 20 mph.

    Low: 48 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 78. Southwest wind 10 to 18 mph, with gusts as high as 32 mph.

    High: 78 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 58. Southwest wind 10 to 14 mph, with gusts as high as 23 mph.

    Low: 58 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Mostly sunny, with a high near 77. West southwest wind 8 to 10 mph, with gusts as high as 16 mph.

    High: 77 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. South wind 7 to 9 mph, with gusts as high as 15 mph.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 80. Breezy, with a south wind 10 to 20 mph, with gusts as high as 31 mph.

    High: 80 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.

    Low: 62 °F

    Mostly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 74. Chance of precipitation is 70%.

    High: 74 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Sunny, with a high near 62. South wind 3 to 6 mph.
Tonight
Increasing clouds, with a low around 48. South wind 6 to 11 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 78. Southwest wind 10 to 18 mph, with gusts as high as 32 mph.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 58. Southwest wind 10 to 14 mph, with gusts as high as 23 mph.
Wednesday
Mostly sunny, with a high near 77. West southwest wind 8 to 10 mph, with gusts as high as 16 mph.
Wednesday Night
Mostly clear, with a low around 57. South wind 7 to 9 mph, with gusts as high as 15 mph.
Thursday
Mostly sunny, with a high near 80. Breezy, with a south wind 10 to 20 mph, with gusts as high as 31 mph.
Thursday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.
Friday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 74. Chance of precipitation is 70%.
Friday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 50.
Saturday
Mostly sunny, with a high near 70.
Saturday Night
Partly cloudy, with a low around 49.
Sunday
Mostly sunny, with a high near 70.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
12:21 pm CDT Apr 20, 2026
Forecast Valid:
12pm CDT Apr 20, 2026-6pm CDT Apr 26, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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