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

77°F

25°C

Humidity 85%
Wind Speed SE 6 mph
Barometer 30.05 in (1017.0 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 15 Jul 7:54 am CDT
Extended Forecast for

Decatur IL

  • Today

    Today: A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. South southeast wind 5 to 7 mph.

    High: 86 °F

    Partly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 72. South southeast wind 3 to 6 mph.

    Low: 72 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Heat index values as high as 101. Southwest wind 5 to 7 mph.

    High: 91 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Southwest wind around 6 mph. Chance of precipitation is 30%.

    Low: 73 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 84. West wind around 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 84 °F

    Partly Sunny
    then Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 67. Northeast wind around 7 mph. Chance of precipitation is 40%.

    Low: 67 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Partly sunny, with a high near 83. Northeast wind 3 to 6 mph.

    High: 83 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 71.

    Low: 71 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.

    High: 87 °F

    Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. South southeast wind 5 to 7 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 72. South southeast wind 3 to 6 mph.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Heat index values as high as 101. Southwest wind 5 to 7 mph.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Southwest wind around 6 mph. Chance of precipitation is 30%.
Thursday
Showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 84. West wind around 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 67. Northeast wind around 7 mph. Chance of precipitation is 40%.
Friday
Partly sunny, with a high near 83. Northeast wind 3 to 6 mph.
Friday Night
Mostly cloudy, with a low around 71.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
Saturday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 89.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.86°N 88.94°W (Elev. 682 ft)
Last Update:
6:41 am CDT Jul 15, 2025
Forecast Valid:
8am CDT Jul 15, 2025-6pm CDT Jul 21, 2025
 
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