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

83°F

28°C

Humidity 74%
Wind Speed SW 8 mph
Barometer 30.05 in (1016.9 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 14 Aug 3:54 pm CDT
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 73. East wind around 7 mph, with gusts as high as 17 mph.

    Low: 73 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms before noon, then a slight chance of showers between noon and 1pm. Mostly cloudy, with a high near 94. Heat index values as high as 107. Southwest wind 6 to 9 mph, with gusts as high as 15 mph. Chance of precipitation is 50%.

    High: 94 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 74. Southwest wind around 7 mph.

    Low: 74 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 91. Heat index values as high as 101. West northwest wind 6 to 9 mph, with gusts as high as 15 mph.

    High: 91 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 69. North northwest wind 3 to 8 mph.

    Low: 69 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 84. North wind 5 to 7 mph.

    High: 84 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 64. North wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 73. East wind around 7 mph, with gusts as high as 17 mph.
Saturday
A chance of showers and thunderstorms before noon, then a slight chance of showers between noon and 1pm. Mostly cloudy, with a high near 94. Heat index values as high as 107. Southwest wind 6 to 9 mph, with gusts as high as 15 mph. Chance of precipitation is 50%.
Saturday Night
Partly cloudy, with a low around 74. Southwest wind around 7 mph.
Sunday
Partly sunny, with a high near 91. Heat index values as high as 101. West northwest wind 6 to 9 mph, with gusts as high as 15 mph.
Sunday Night
Partly cloudy, with a low around 69. North northwest wind 3 to 8 mph.
Monday
Mostly sunny, with a high near 84. North wind 5 to 7 mph.
Monday Night
Partly cloudy, with a low around 64. North wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 86.
Tuesday Night
Mostly clear, with a low around 69.
Wednesday
Partly sunny, with a high near 88.
Wednesday Night
Mostly cloudy, with a low around 66.
Thursday
Partly sunny, with a high near 81.
Thursday Night
Partly cloudy, with a low around 63.
Friday
Mostly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
1:41 pm CDT Aug 14, 2026
Forecast Valid:
4pm CDT Aug 14, 2026-6pm CDT Aug 21, 2026
 
Forecast Discussion
 
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Additional Resources

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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