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.

Mostly Cloudy

35°F

2°C

Humidity 72%
Wind Speed NE 9 mph
Barometer 30.16 in (1021.7 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 14 Mar 6:54 am CDT
Extended Forecast for

Decatur IL

  • Today

    Today: Partly sunny, with a high near 53. East southeast wind 7 to 14 mph, with gusts as high as 22 mph.

    High: 53 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 45. East southeast wind 13 to 17 mph, with gusts as high as 28 mph.

    Low: 45 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of rain and thunderstorms, then rain and possibly a thunderstorm after 1pm. High near 67. Breezy, with a south wind 21 to 29 mph, with gusts as high as 47 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 67 °F

    Breezy.
    Chance Rain
    then Rain

  • Sunday Night

    Sunday Night: Rain before 1am, then snow likely. Patchy blowing snow after 1am. Low around 20. Blustery, with a south wind 23 to 26 mph becoming west northwest after midnight. Winds could gust as high as 38 mph. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.

    Low: 20 °F

    Rain and
    Breezy then
    Rain/Snow and
    Patchy
    Blowing Snow

  • Monday

    Monday: A 40 percent chance of snow before 1pm. Patchy blowing snow after 9am. Cloudy, with a high near 25. Blustery, with a west northwest wind 24 to 26 mph, with gusts as high as 40 mph.

    High: 25 °F

    Chance Snow
    and Patchy
    Blowing Snow

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 9. Blustery, with a west northwest wind 14 to 21 mph, with gusts as high as 31 mph.

    Low: 9 °F

    Mostly Cloudy
    and Blustery
    then Mostly
    Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 28. West northwest wind 8 to 11 mph, with gusts as high as 18 mph.

    High: 28 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 23.

    Low: 23 °F

    Chance Snow

  • Wednesday

    Wednesday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 53. East southeast wind 7 to 14 mph, with gusts as high as 22 mph.
Tonight
Mostly cloudy, with a low around 45. East southeast wind 13 to 17 mph, with gusts as high as 28 mph.
Sunday
A chance of rain and thunderstorms, then rain and possibly a thunderstorm after 1pm. High near 67. Breezy, with a south wind 21 to 29 mph, with gusts as high as 47 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Rain before 1am, then snow likely. Patchy blowing snow after 1am. Low around 20. Blustery, with a south wind 23 to 26 mph becoming west northwest after midnight. Winds could gust as high as 38 mph. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.
Monday
A 40 percent chance of snow before 1pm. Patchy blowing snow after 9am. Cloudy, with a high near 25. Blustery, with a west northwest wind 24 to 26 mph, with gusts as high as 40 mph.
Monday Night
Mostly cloudy, with a low around 9. Blustery, with a west northwest wind 14 to 21 mph, with gusts as high as 31 mph.
Tuesday
Mostly sunny, with a high near 28. West northwest wind 8 to 11 mph, with gusts as high as 18 mph.
Tuesday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 23.
Wednesday
Mostly sunny, with a high near 54.
Wednesday Night
Mostly clear, with a low around 35.
Thursday
Mostly sunny, with a high near 64.
Thursday Night
Partly cloudy, with a low around 43.
Friday
Mostly sunny, with a high near 63.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.86°N 88.94°W (Elev. 682 ft)
Last Update:
6:26 am CDT Mar 14, 2026
Forecast Valid:
7am CDT Mar 14, 2026-6pm CDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation