National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

90°F

32°C

Humidity 59%
Wind Speed S 16 mph
Barometer 30.05 in (1017.0 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 9 Aug 1:54 pm CDT
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 91. South wind 11 to 13 mph, with gusts as high as 21 mph.

    High: 91 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 72. South wind 7 to 9 mph, with gusts as high as 16 mph.

    Low: 72 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers before 10am. Partly sunny, with a high near 90. South wind 7 to 11 mph, with gusts as high as 16 mph.

    High: 90 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 72. South wind around 7 mph.

    Low: 72 °F

    Partly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. South southwest wind 6 to 9 mph.

    High: 90 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 72. South wind around 6 mph.

    Low: 72 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 88. Southwest wind 5 to 7 mph. Chance of precipitation is 50%.

    High: 88 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny
    then Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 91. South wind 11 to 13 mph, with gusts as high as 21 mph.
Tonight
Partly cloudy, with a low around 72. South wind 7 to 9 mph, with gusts as high as 16 mph.
Sunday
A 20 percent chance of showers before 10am. Partly sunny, with a high near 90. South wind 7 to 11 mph, with gusts as high as 16 mph.
Sunday Night
Partly cloudy, with a low around 72. South wind around 7 mph.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. South southwest wind 6 to 9 mph.
Monday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 72. South wind around 6 mph.
Tuesday
A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 88. Southwest wind 5 to 7 mph. Chance of precipitation is 50%.
Tuesday Night
Partly cloudy, with a low around 70.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88.
Wednesday Night
Partly cloudy, with a low around 69.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Thursday Night
Partly cloudy, with a low around 71.
Friday
Mostly sunny, with a high near 89.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.86°N 88.94°W (Elev. 682 ft)
Last Update:
2:09 pm CDT Aug 9, 2025
Forecast Valid:
2pm CDT Aug 9, 2025-6pm CDT Aug 15, 2025
 
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