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

86°F

30°C

Humidity 40%
Wind Speed SW 10 mph
Barometer 30.14 in (1020.3 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 3 Oct 4:54 pm CDT
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: A 20 percent chance of showers. Mostly sunny, with a high near 89. South southwest wind around 8 mph.

    High: 89 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: A 10 percent chance of showers before 7pm. Mostly clear, with a low around 64. South wind 3 to 6 mph.

    Low: 64 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 88. South wind 6 to 13 mph, with gusts as high as 18 mph.

    High: 88 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 60. South wind 6 to 8 mph.

    Low: 60 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 87. South wind 7 to 14 mph, with gusts as high as 23 mph.

    High: 87 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 64. South wind 7 to 10 mph, with gusts as high as 15 mph.

    Low: 64 °F

    Mostly Clear

  • Monday

    Monday: A 30 percent chance of showers after 1pm. Sunny, with a high near 87. South southwest wind 6 to 9 mph.

    High: 87 °F

    Sunny then
    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 63. Chance of precipitation is 50%.

    Low: 63 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A 40 percent chance of showers before 1pm. Partly sunny, with a high near 77.

    High: 77 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
A 20 percent chance of showers. Mostly sunny, with a high near 89. South southwest wind around 8 mph.
Tonight
A 10 percent chance of showers before 7pm. Mostly clear, with a low around 64. South wind 3 to 6 mph.
Saturday
Sunny, with a high near 88. South wind 6 to 13 mph, with gusts as high as 18 mph.
Saturday Night
Clear, with a low around 60. South wind 6 to 8 mph.
Sunday
Sunny, with a high near 87. South wind 7 to 14 mph, with gusts as high as 23 mph.
Sunday Night
Mostly clear, with a low around 64. South wind 7 to 10 mph, with gusts as high as 15 mph.
Monday
A 30 percent chance of showers after 1pm. Sunny, with a high near 87. South southwest wind 6 to 9 mph.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 63. Chance of precipitation is 50%.
Tuesday
A 40 percent chance of showers before 1pm. Partly sunny, with a high near 77.
Tuesday Night
Partly cloudy, with a low around 53.
Wednesday
Sunny, with a high near 74.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
Sunny, with a high near 74.
Thursday Night
Mostly clear, with a low around 48.
Friday
Sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
4:36 pm CDT Oct 3, 2025
Forecast Valid:
5pm CDT Oct 3, 2025-6pm CDT Oct 10, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation