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.

Fair and Breezy

62°F

17°C

Humidity 44%
Wind Speed S 22 mph
Barometer 29.99 in (1015.7 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 16 Feb 2:54 pm CST
Extended Forecast for

Decatur IL

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 63. South southwest wind 10 to 14 mph, with gusts as high as 22 mph.

    High: 63 °F

    Mostly Sunny

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 41. South wind around 9 mph, with gusts as high as 18 mph.

    Low: 41 °F

    Partly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 10am. Otherwise, cloudy, with a high near 61. South wind 8 to 18 mph, with gusts as high as 31 mph.

    High: 61 °F

    Patchy Fog
    then Cloudy

  • Tuesday Night

    Tuesday Night: A 40 percent chance of rain after midnight. Cloudy, then gradually becoming partly cloudy, with a low around 53. Breezy, with a south wind 17 to 21 mph, with gusts as high as 31 mph.

    Low: 53 °F

    Breezy.
    Cloudy then
    Chance Rain

  • Wednesday

    Wednesday: Sunny, with a high near 68. West southwest wind 10 to 17 mph, with gusts as high as 28 mph.

    High: 68 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 45. Southwest wind 6 to 8 mph becoming southeast after midnight.

    Low: 45 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Rain likely after noon. Partly sunny, with a high near 67. South southeast wind 8 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 67 °F

    Partly Sunny
    then Rain
    Likely

  • Thursday Night

    Thursday Night: A 50 percent chance of rain before midnight. Partly cloudy, with a low around 36.

    Low: 36 °F

    Chance Rain
    then Mostly
    Clear

  • Friday

    Friday: Partly sunny, with a high near 47.

    High: 47 °F

    Partly Sunny

Detailed Forecast

Washington's Birthday
Mostly sunny, with a high near 63. South southwest wind 10 to 14 mph, with gusts as high as 22 mph.
Tonight
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 41. South wind around 9 mph, with gusts as high as 18 mph.
Tuesday
Patchy fog before 10am. Otherwise, cloudy, with a high near 61. South wind 8 to 18 mph, with gusts as high as 31 mph.
Tuesday Night
A 40 percent chance of rain after midnight. Cloudy, then gradually becoming partly cloudy, with a low around 53. Breezy, with a south wind 17 to 21 mph, with gusts as high as 31 mph.
Wednesday
Sunny, with a high near 68. West southwest wind 10 to 17 mph, with gusts as high as 28 mph.
Wednesday Night
Increasing clouds, with a low around 45. Southwest wind 6 to 8 mph becoming southeast after midnight.
Thursday
Rain likely after noon. Partly sunny, with a high near 67. South southeast wind 8 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
A 50 percent chance of rain before midnight. Partly cloudy, with a low around 36.
Friday
Partly sunny, with a high near 47.
Friday Night
Mostly cloudy, with a low around 28.
Saturday
Partly sunny, with a high near 44.
Saturday Night
Partly cloudy, with a low around 25.
Sunday
Mostly sunny, with a high near 39.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
2:37 pm CST Feb 16, 2026
Forecast Valid:
3pm CST Feb 16, 2026-6pm CST Feb 22, 2026
 
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Additional Resources

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Chance of Precipitation