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.

Overcast

73°F

23°C

Humidity 90%
Wind Speed SE 10 mph
Barometer 30.02 in (1016.0 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 14 Aug 5:54 am CDT
Extended Forecast for

Decatur IL

  • Today

    Today: Showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms after 2pm. High near 90. Heat index values as high as 103. East southeast wind around 7 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 90 °F

    Showers then
    Slight Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms between 1am and 4am, then a slight chance of showers after 4am. Partly cloudy, with a low around 74. East wind 5 to 8 mph. Chance of precipitation is 20%.

    Low: 74 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers between 11am and 1pm. Partly sunny, with a high near 92. Heat index values as high as 105. Southeast wind 7 to 9 mph becoming southwest in the morning. Winds could gust as high as 16 mph.

    High: 92 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 74. West southwest wind 5 to 7 mph.

    Low: 74 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 90. West northwest wind 6 to 9 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.

    High: 90 °F

    Partly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 70. North northwest wind 5 to 10 mph. Chance of precipitation is 30%.

    Low: 70 °F

    Chance
    T-storms then
    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 83. North wind 6 to 9 mph.

    High: 83 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

Detailed Forecast

Today
Showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms after 2pm. High near 90. Heat index values as high as 103. East southeast wind around 7 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
A slight chance of showers and thunderstorms between 1am and 4am, then a slight chance of showers after 4am. Partly cloudy, with a low around 74. East wind 5 to 8 mph. Chance of precipitation is 20%.
Saturday
A 30 percent chance of showers between 11am and 1pm. Partly sunny, with a high near 92. Heat index values as high as 105. Southeast wind 7 to 9 mph becoming southwest in the morning. Winds could gust as high as 16 mph.
Saturday Night
Partly cloudy, with a low around 74. West southwest wind 5 to 7 mph.
Sunday
A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 90. West northwest wind 6 to 9 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.
Sunday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 70. North northwest wind 5 to 10 mph. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 83. North wind 6 to 9 mph.
Monday Night
Partly cloudy, with a low around 63.
Tuesday
Sunny, with a high near 84.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Mostly sunny, with a high near 88.
Wednesday Night
A chance of showers. Partly cloudy, with a low around 68.
Thursday
Mostly sunny, with a high near 82.
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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:
4:36 am CDT Aug 14, 2026
Forecast Valid:
6am CDT Aug 14, 2026-6pm CDT Aug 20, 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