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.

Partly Cloudy

62°F

17°C

Humidity 84%
Wind Speed SW 20 G 26 mph
Barometer 29.86 in (1010.7 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 16 Apr 8:54 am CDT
Extended Forecast for

Decatur Airport IL

  • Today

    Today: Mostly cloudy early, then gradual clearing, with a high near 80. West wind around 15 mph, with gusts as high as 25 mph.

    High: 80 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 57. West wind 5 to 7 mph becoming south after midnight.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84. Breezy, with a south wind 7 to 12 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 31 mph.

    High: 84 °F

    Partly Sunny
    then Chance
    Showers and
    Breezy

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 52. South wind 16 to 18 mph becoming west southwest after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    Low: 52 °F

    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 59. Breezy, with a west northwest wind 17 to 20 mph, with gusts as high as 29 mph.

    High: 59 °F

    Chance
    Showers and
    Breezy

  • Saturday Night

    Saturday Night: Patchy frost after 3am. Otherwise, mostly clear, with a low around 37. West northwest wind 10 to 15 mph, with gusts as high as 23 mph.

    Low: 37 °F

    Mostly Clear
    then Patchy
    Frost

  • Sunday

    Sunday: Patchy frost before 8am. Otherwise, sunny, with a high near 58. West northwest wind 10 to 18 mph, with gusts as high as 28 mph.

    High: 58 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy early, then gradual clearing, with a high near 80. West wind around 15 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 57. West wind 5 to 7 mph becoming south after midnight.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84. Breezy, with a south wind 7 to 12 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 31 mph.
Friday Night
Showers and possibly a thunderstorm. Low around 52. South wind 16 to 18 mph becoming west southwest after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Saturday
A 40 percent chance of showers before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 59. Breezy, with a west northwest wind 17 to 20 mph, with gusts as high as 29 mph.
Saturday Night
Patchy frost after 3am. Otherwise, mostly clear, with a low around 37. West northwest wind 10 to 15 mph, with gusts as high as 23 mph.
Sunday
Patchy frost before 8am. Otherwise, sunny, with a high near 58. West northwest wind 10 to 18 mph, with gusts as high as 28 mph.
Sunday Night
Mostly clear, with a low around 38.
Monday
Sunny, with a high near 65.
Monday Night
Mostly clear, with a low around 50.
Tuesday
Mostly sunny, with a high near 74.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Sunny, with a high near 75.
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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:
7:55 am CDT Apr 16, 2026
Forecast Valid:
9am CDT Apr 16, 2026-6pm CDT Apr 22, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation