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.

Overcast

70°F

21°C

Humidity 71%
Wind Speed S 7 mph
Barometer 30.01 in (1015.5 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 26 Aug 3:54 am CDT
Extended Forecast for

Decatur IL

  • Today

    Today: A 30 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 87. South wind 5 to 11 mph becoming west in the afternoon. Winds could gust as high as 18 mph.

    High: 87 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 64. West northwest wind 5 to 8 mph becoming calm in the evening.

    Low: 64 °F

    Chance
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 84. North northwest wind 3 to 8 mph.

    High: 84 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming clear, with a low around 61. North wind 5 to 7 mph becoming calm in the evening.

    Low: 61 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 82. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 59. East northeast wind around 5 mph becoming calm in the evening.

    Low: 59 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 84. South wind 3 to 6 mph.

    High: 84 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 87. South wind 5 to 11 mph becoming west in the afternoon. Winds could gust as high as 18 mph.
Tonight
A 30 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 64. West northwest wind 5 to 8 mph becoming calm in the evening.
Thursday
Sunny, with a high near 84. North northwest wind 3 to 8 mph.
Thursday Night
Mostly cloudy, then gradually becoming clear, with a low around 61. North wind 5 to 7 mph becoming calm in the evening.
Friday
Sunny, with a high near 82. Calm wind becoming northeast around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 59. East northeast wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 84. South wind 3 to 6 mph.
Saturday Night
Partly cloudy, with a low around 65.
Sunday
Mostly sunny, with a high near 90.
Sunday Night
Mostly clear, with a low around 70.
Monday
Mostly sunny, with a high near 91.
Monday Night
Partly cloudy, with a low around 73.
Tuesday
Mostly sunny, with a high near 91.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.91°W (Elev. 620 ft)
Last Update:
3:26 am CDT Aug 26, 2026
Forecast Valid:
4am CDT Aug 26, 2026-6pm CDT Sep 1, 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