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.

Light Rain

78°F

26°C

Humidity 85%
Wind Speed W 3 mph
Barometer 29.91 in (1012.3 mb)
Dewpoint 73°F (23°C)
Visibility 4.00 mi
Heat Index80°F (27°C)
Last update 19 Aug 5:54 pm CDT
Extended Forecast for

4 Miles SSW Assumption IL

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly before 10pm. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 66. Light and variable wind.

    Low: 66 °F

    Chance
    T-storms and
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 82. Northeast wind 3 to 6 mph.

    High: 82 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 62. Light east northeast wind.

    Low: 62 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 84. Calm wind becoming west around 6 mph in the afternoon.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: A chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Mostly clear, with a low around 64. Light west wind. Chance of precipitation is 30%.

    Low: 64 °F

    Mostly Clear
    then Chance
    T-storms

  • Saturday

    Saturday: Sunny, with a high near 84. Light west northwest wind becoming northwest 5 to 9 mph in the morning. Winds could gust as high as 15 mph.

    High: 84 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 61. North northwest wind around 5 mph becoming calm in the evening.

    Low: 61 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 60.

    Low: 60 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms, mainly before 10pm. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 66. Light and variable wind.
Thursday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 82. Northeast wind 3 to 6 mph.
Thursday Night
Mostly clear, with a low around 62. Light east northeast wind.
Friday
Sunny, with a high near 84. Calm wind becoming west around 6 mph in the afternoon.
Friday Night
A chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Mostly clear, with a low around 64. Light west wind. Chance of precipitation is 30%.
Saturday
Sunny, with a high near 84. Light west northwest wind becoming northwest 5 to 9 mph in the morning. Winds could gust as high as 15 mph.
Saturday Night
Mostly clear, with a low around 61. North northwest wind around 5 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 82.
Sunday Night
Mostly cloudy, with a low around 60.
Monday
Mostly sunny, with a high near 83.
Monday Night
Partly cloudy, with a low around 63.
Tuesday
Mostly sunny, with a high near 86.
Tuesday Night
Partly cloudy, with a low around 64.
Wednesday
Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Assumption IL
 39.47°N 89.08°W (Elev. 650 ft)
Last Update:
6:26 pm CDT Aug 19, 2026
Forecast Valid:
6pm CDT Aug 19, 2026-6pm CDT Aug 26, 2026
 
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