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.

Mostly Cloudy

67°F

19°C

Humidity 84%
Wind Speed W 10 G 20 mph
Barometer 29.88 in (1011.4 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 3 Apr 12:54 am CDT
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms before 3am. Mostly cloudy, with a low around 56. West southwest wind 7 to 10 mph, with gusts as high as 18 mph.

    Low: 56 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 77. Light and variable wind becoming south 6 to 11 mph in the morning. Winds could gust as high as 20 mph.

    High: 77 °F

    Partly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2am. Low around 58. South wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 58 °F

    Chance
    T-storms then
    T-storms

  • Saturday

    Saturday: Showers likely before 1pm. Mostly cloudy, with a temperature falling to around 53 by 5pm. West wind 14 to 17 mph, with gusts as high as 32 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    High: 64 °F⇓

    Showers
    Likely

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 37. West northwest wind 10 to 15 mph, with gusts as high as 28 mph.

    Low: 37 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Mostly sunny, with a high near 53. West northwest wind 10 to 14 mph, with gusts as high as 22 mph.

    High: 53 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37. West wind 6 to 9 mph, with gusts as high as 15 mph.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 55.

    High: 55 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms before 3am. Mostly cloudy, with a low around 56. West southwest wind 7 to 10 mph, with gusts as high as 18 mph.
Friday
A 40 percent chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 77. Light and variable wind becoming south 6 to 11 mph in the morning. Winds could gust as high as 20 mph.
Friday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2am. Low around 58. South wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
Showers likely before 1pm. Mostly cloudy, with a temperature falling to around 53 by 5pm. West wind 14 to 17 mph, with gusts as high as 32 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 37. West northwest wind 10 to 15 mph, with gusts as high as 28 mph.
Sunday
Mostly sunny, with a high near 53. West northwest wind 10 to 14 mph, with gusts as high as 22 mph.
Sunday Night
Mostly clear, with a low around 37. West wind 6 to 9 mph, with gusts as high as 15 mph.
Monday
Sunny, with a high near 55.
Monday Night
Mostly clear, with a low around 30.
Tuesday
Sunny, with a high near 51.
Tuesday Night
Partly cloudy, with a low around 36.
Wednesday
Partly sunny, with a high near 66.
Wednesday Night
Partly cloudy, with a low around 50.
Thursday
Partly sunny, with a high near 73.
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:
1:41 am CDT Apr 3, 2026
Forecast Valid:
2am CDT Apr 3, 2026-6pm CDT Apr 9, 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