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Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Partly Cloudy

82°F

28°C

Humidity 69%
Wind Speed NE 8 mph
Barometer 29.96 in (1014.1 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 5 Jul 2:54 pm CDT
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. North wind around 8 mph.

    High: 83 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 65. North wind 5 to 8 mph.

    Low: 65 °F

    Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 82. North northeast wind 6 to 10 mph.

    High: 82 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 62. North northeast wind 5 to 9 mph.

    Low: 62 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 85. Northeast wind around 6 mph.

    High: 85 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64. Northeast wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 86. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 86 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.

    High: 88 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. North wind around 8 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 65. North wind 5 to 8 mph.
Monday
Partly sunny, with a high near 82. North northeast wind 6 to 10 mph.
Monday Night
Partly cloudy, with a low around 62. North northeast wind 5 to 9 mph.
Tuesday
Sunny, with a high near 85. Northeast wind around 6 mph.
Tuesday Night
Mostly clear, with a low around 64. Northeast wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 86. Calm wind becoming south southwest around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 68.
Thursday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Thursday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.
Friday
A chance of showers. Mostly cloudy, with a high near 84.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Saturday
Mostly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.86°N 88.94°W (Elev. 682 ft)
Last Update:
1:59 pm CDT Jul 5, 2026
Forecast Valid:
3pm CDT Jul 5, 2026-6pm CDT Jul 11, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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