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

81°F

27°C

Humidity 82%
Wind Speed E 3 mph
Barometer 30.05 in (1016.8 mb)
Dewpoint 75°F (24°C)
Visibility 9.00 mi
Heat Index87°F (31°C)
Last update 13 Jul 11:54 am CDT
Extended Forecast for

Decatur Airport IL

  • This Afternoon

    This Afternoon: Showers likely and possibly a thunderstorm before 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 85. South southwest wind 5 to 7 mph becoming northwest. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Showers
    Likely

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 9pm. Mostly cloudy, with a low around 69. Southeast wind around 6 mph becoming calm in the evening.

    Low: 69 °F

    Chance
    Showers then
    Partly Cloudy

  • Monday

    Monday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 88. Calm wind becoming east around 5 mph.

    High: 88 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. East southeast wind 5 to 7 mph becoming south in the afternoon.

    High: 90 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 73. South wind around 6 mph.

    Low: 73 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Southwest wind 7 to 10 mph, with gusts as high as 15 mph.

    High: 90 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73.

    Low: 73 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86.

    High: 86 °F

    Partly Sunny
    then Chance
    T-storms

Detailed Forecast

This Afternoon
Showers likely and possibly a thunderstorm before 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 85. South southwest wind 5 to 7 mph becoming northwest. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 9pm. Mostly cloudy, with a low around 69. Southeast wind around 6 mph becoming calm in the evening.
Monday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 88. Calm wind becoming east around 5 mph.
Monday Night
Partly cloudy, with a low around 70. Calm wind.
Tuesday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. East southeast wind 5 to 7 mph becoming south in the afternoon.
Tuesday Night
Partly cloudy, with a low around 73. South wind around 6 mph.
Wednesday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Southwest wind 7 to 10 mph, with gusts as high as 15 mph.
Wednesday Night
A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73.
Thursday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86.
Thursday Night
A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 67.
Friday
A chance of showers. Mostly sunny, with a high near 85.
Friday Night
Partly cloudy, with a low around 68.
Saturday
A chance of showers. Mostly sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur Airport IL
 39.84°N 88.88°W (Elev. 650 ft)
Last Update:
12:26 pm CDT Jul 13, 2025
Forecast Valid:
12pm CDT Jul 13, 2025-6pm CDT Jul 19, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation