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.

A Few Clouds

66°F

19°C

Humidity 75%
Wind Speed SW 10 mph
Barometer 30.15 in (1020.7 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 24 Jun 6:54 am CDT
Extended Forecast for

Decatur IL

  • Today

    Today: A 40 percent chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 80. South wind 6 to 10 mph, with gusts as high as 17 mph.

    High: 80 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South southwest wind 5 to 8 mph becoming calm after midnight. Chance of precipitation is 40%.

    Low: 63 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 82. West southwest wind 3 to 7 mph.

    High: 82 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 64. Light and variable wind becoming east around 6 mph after midnight. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 64 °F

    Chance
    T-storms then
    T-storms
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 77. East wind 7 to 9 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 77 °F

    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. East southeast wind 5 to 9 mph.

    Low: 64 °F

    Chance
    T-storms

  • Saturday

    Saturday: Partly sunny, with a high near 83. East wind around 6 mph becoming south southeast in the afternoon.

    High: 83 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

Detailed Forecast

Today
A 40 percent chance of showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 80. South wind 6 to 10 mph, with gusts as high as 17 mph.
Tonight
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South southwest wind 5 to 8 mph becoming calm after midnight. Chance of precipitation is 40%.
Thursday
Partly sunny, with a high near 82. West southwest wind 3 to 7 mph.
Thursday Night
Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 64. Light and variable wind becoming east around 6 mph after midnight. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Showers and possibly a thunderstorm. High near 77. East wind 7 to 9 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. East southeast wind 5 to 9 mph.
Saturday
Partly sunny, with a high near 83. East wind around 6 mph becoming south southeast in the afternoon.
Saturday Night
Partly cloudy, with a low around 69.
Sunday
Mostly sunny, with a high near 90.
Sunday Night
Mostly clear, with a low around 73.
Monday
Sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Sunny, with a high near 93.
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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:
6:36 am CDT Jun 24, 2026
Forecast Valid:
7am CDT Jun 24, 2026-6pm CDT Jun 30, 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