National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

83°F

28°C

Humidity 74%
Wind Speed SE 9 mph
Barometer 30.02 in (1015.9 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 8 Aug 7:54 pm CDT
Extended Forecast for

2 Miles SSW Decatur IL

  • Tonight

    Tonight: Mostly clear, with a low around 73. South southeast wind around 8 mph, with gusts as high as 15 mph.

    Low: 73 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 91. Heat index values as high as 100. South wind 8 to 13 mph, with gusts as high as 20 mph.

    High: 91 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 73. South southeast wind 7 to 10 mph, with gusts as high as 15 mph.

    Low: 73 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 90. South wind 7 to 10 mph, with gusts as high as 16 mph.

    High: 90 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 72. South southeast wind around 7 mph.

    Low: 72 °F

    Partly Cloudy

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. South southwest wind 6 to 9 mph.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. South southwest wind 3 to 6 mph. Chance of precipitation is 50%.

    Low: 70 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.

    High: 86 °F

    Chance
    T-storms

  • Tuesday Night

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

    Low: 69 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 73. South southeast wind around 8 mph, with gusts as high as 15 mph.
Saturday
Sunny, with a high near 91. Heat index values as high as 100. South wind 8 to 13 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 73. South southeast wind 7 to 10 mph, with gusts as high as 15 mph.
Sunday
Mostly sunny, with a high near 90. South wind 7 to 10 mph, with gusts as high as 16 mph.
Sunday Night
Partly cloudy, with a low around 72. South southeast wind around 7 mph.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. South southwest wind 6 to 9 mph.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. South southwest wind 3 to 6 mph. Chance of precipitation is 50%.
Tuesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Tuesday Night
Partly cloudy, with a low around 69.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
A chance of showers. Mostly sunny, with a high near 88.
Thursday Night
Mostly clear, with a low around 70.
Friday
Sunny, with a high near 91.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSW Decatur IL
 39.86°N 88.94°W (Elev. 682 ft)
Last Update:
7:40 pm CDT Aug 8, 2025
Forecast Valid:
8pm CDT Aug 8, 2025-6pm CDT Aug 15, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation