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.

Partly Cloudy

70°F

21°C

Humidity 93%
Wind Speed Calm
Barometer 29.89 in (1011.5 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 17 Jun 2:54 am CDT
Extended Forecast for

4 Miles WSW Sullivan IL

  • Overnight

    Overnight: Patchy fog. Otherwise, mostly cloudy, with a low around 67. Light south wind.

    Low: 67 °F

    Patchy Fog

  • Tuesday

    Tuesday: Areas of fog before 9am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 86. South southwest wind 3 to 6 mph.

    High: 86 °F

    Areas Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly after 4am. Partly cloudy, with a low around 71. South wind 5 to 7 mph.

    Low: 71 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 10am. High near 84. Southwest wind 9 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 84 °F

    Showers
    Likely then
    T-storms

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 66. Southwest wind 7 to 10 mph, with gusts as high as 18 mph.

    Low: 66 °F

    Chance
    T-storms

  • Juneteenth

    Juneteenth: Sunny, with a high near 82. West northwest wind around 6 mph.

    High: 82 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 65. Calm wind.

    Low: 65 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

Detailed Forecast

Overnight
Patchy fog. Otherwise, mostly cloudy, with a low around 67. Light south wind.
Tuesday
Areas of fog before 9am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 86. South southwest wind 3 to 6 mph.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly after 4am. Partly cloudy, with a low around 71. South wind 5 to 7 mph.
Wednesday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 10am. High near 84. Southwest wind 9 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 66. Southwest wind 7 to 10 mph, with gusts as high as 18 mph.
Juneteenth
Sunny, with a high near 82. West northwest wind around 6 mph.
Thursday Night
Mostly clear, with a low around 65. Calm wind.
Friday
Sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 72.
Saturday
Sunny, with a high near 91.
Saturday Night
Mostly clear, with a low around 74.
Sunday
Sunny, with a high near 92.
Sunday Night
Mostly clear, with a low around 73.
Monday
Sunny, with a high near 92.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WSW Sullivan IL
 39.57°N 88.67°W (Elev. 676 ft)
Last Update:
1:40 am CDT Jun 17, 2025
Forecast Valid:
3am CDT Jun 17, 2025-6pm CDT Jun 23, 2025
 
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