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.

A Few Clouds

77°F

25°C

Humidity 90%
Wind Speed NW 5 mph
Barometer 30.03 in (1016.3 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 16 Aug 8:54 am CDT
Extended Forecast for

Decatur IL

  • Today

    Today: A chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms after 3pm. Mostly cloudy, with a high near 86. West wind 7 to 9 mph, with gusts as high as 16 mph. Chance of precipitation is 30%.

    High: 86 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 68. Northwest wind 3 to 6 mph.

    Low: 68 °F

    Slight Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 82. North northwest wind 6 to 8 mph.

    High: 82 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 63. North wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 85 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers after 1am. Partly cloudy, with a low around 68. Light south wind.

    Low: 68 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A 50 percent chance of showers before 1pm. Partly sunny, with a high near 81. Light and variable wind becoming north northwest 5 to 7 mph in the morning.

    High: 81 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

Detailed Forecast

Today
A chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms after 3pm. Mostly cloudy, with a high near 86. West wind 7 to 9 mph, with gusts as high as 16 mph. Chance of precipitation is 30%.
Tonight
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 68. Northwest wind 3 to 6 mph.
Monday
Mostly sunny, with a high near 82. North northwest wind 6 to 8 mph.
Monday Night
Mostly clear, with a low around 63. North wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the afternoon.
Tuesday Night
A 50 percent chance of showers after 1am. Partly cloudy, with a low around 68. Light south wind.
Wednesday
A 50 percent chance of showers before 1pm. Partly sunny, with a high near 81. Light and variable wind becoming north northwest 5 to 7 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 63.
Thursday
Mostly sunny, with a high near 79.
Thursday Night
Partly cloudy, with a low around 61.
Friday
Mostly sunny, with a high near 80.
Friday Night
Partly cloudy, with a low around 63.
Saturday
Mostly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
8:21 am CDT Aug 16, 2026
Forecast Valid:
9am CDT Aug 16, 2026-6pm CDT Aug 22, 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