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

72°F

22°C

Humidity 94%
Wind Speed SW 12 mph
Barometer 30.05 in (1016.8 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 8 Aug 5:54 am CDT
Extended Forecast for

3 Miles NNW Sullivan IL

  • Today

    Today: Sunny, with a high near 86. West wind around 7 mph.

    High: 86 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 68. Light and variable wind.

    Low: 68 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 88. South wind 5 to 14 mph, with gusts as high as 22 mph.

    High: 88 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 73. South wind around 11 mph, with gusts as high as 17 mph.

    Low: 73 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 90. Southwest wind 9 to 13 mph, with gusts as high as 18 mph.

    High: 90 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 74. South southwest wind 9 to 11 mph, with gusts as high as 17 mph.

    Low: 74 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89. Southwest wind 9 to 11 mph, with gusts as high as 18 mph.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely after 1am. Partly cloudy, with a low around 71. Chance of precipitation is 60%.

    Low: 71 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 86. Chance of precipitation is 50%.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 86. West wind around 7 mph.
Tonight
Mostly clear, with a low around 68. Light and variable wind.
Sunday
Mostly sunny, with a high near 88. South wind 5 to 14 mph, with gusts as high as 22 mph.
Sunday Night
Partly cloudy, with a low around 73. South wind around 11 mph, with gusts as high as 17 mph.
Monday
Mostly sunny, with a high near 90. Southwest wind 9 to 13 mph, with gusts as high as 18 mph.
Monday Night
Partly cloudy, with a low around 74. South southwest wind 9 to 11 mph, with gusts as high as 17 mph.
Tuesday
Mostly sunny, with a high near 89. Southwest wind 9 to 11 mph, with gusts as high as 18 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers likely after 1am. Partly cloudy, with a low around 71. Chance of precipitation is 60%.
Wednesday
A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 86. Chance of precipitation is 50%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely after 1am. Partly cloudy, with a low around 67. Chance of precipitation is 60%.
Thursday
A chance of showers. Mostly cloudy, with a high near 81.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 64.
Friday
A chance of showers. Partly sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Sullivan IL
 39.63°N 88.64°W (Elev. 682 ft)
Last Update:
1:41 am CDT Aug 8, 2026
Forecast Valid:
6am CDT Aug 8, 2026-6pm CDT Aug 14, 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