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 and Breezy

27°F

-3°C

Humidity 45%
Wind Speed NW 23 G 33 mph
Barometer 30.37 in (1029.5 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Wind Chill13°F (-11°C)
Last update 22 Feb 1:54 pm CST
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 27. Blustery, with a northwest wind 20 to 22 mph, with gusts as high as 33 mph.

    High: 27 °F

    Mostly Cloudy
    and Blustery

  • Tonight

    Tonight: Mostly cloudy, with a low around 15. Wind chill values between zero and 8. Blustery, with a northwest wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 15 °F

    Mostly Cloudy
    and Blustery
    then Mostly
    Cloudy

  • Monday

    Monday: Partly sunny, then gradually becoming sunny, with a high near 30. Wind chill values between 1 and 11. North northwest wind 8 to 16 mph, with gusts as high as 24 mph.

    High: 30 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 19. Calm wind becoming south 5 to 9 mph after midnight. Winds could gust as high as 16 mph.

    Low: 19 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 46. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 46 °F

    Mostly Cloudy
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 29. South southwest wind 9 to 14 mph becoming west northwest after midnight. Winds could gust as high as 22 mph.

    Low: 29 °F

    Decreasing
    Clouds

  • Wednesday

    Wednesday: Mostly sunny, with a high near 47. West northwest wind 6 to 9 mph becoming south in the afternoon.

    High: 47 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Rain likely. Mostly cloudy, with a low around 30. Chance of precipitation is 70%.

    Low: 30 °F

    Rain Likely

  • Thursday

    Thursday: A 30 percent chance of rain before noon. Partly sunny, with a high near 44.

    High: 44 °F

    Chance Rain
    then Mostly
    Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 27. Blustery, with a northwest wind 20 to 22 mph, with gusts as high as 33 mph.
Tonight
Mostly cloudy, with a low around 15. Wind chill values between zero and 8. Blustery, with a northwest wind 15 to 20 mph, with gusts as high as 30 mph.
Monday
Partly sunny, then gradually becoming sunny, with a high near 30. Wind chill values between 1 and 11. North northwest wind 8 to 16 mph, with gusts as high as 24 mph.
Monday Night
Increasing clouds, with a low around 19. Calm wind becoming south 5 to 9 mph after midnight. Winds could gust as high as 16 mph.
Tuesday
Mostly cloudy, with a high near 46. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph.
Tuesday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 29. South southwest wind 9 to 14 mph becoming west northwest after midnight. Winds could gust as high as 22 mph.
Wednesday
Mostly sunny, with a high near 47. West northwest wind 6 to 9 mph becoming south in the afternoon.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 30. Chance of precipitation is 70%.
Thursday
A 30 percent chance of rain before noon. Partly sunny, with a high near 44.
Thursday Night
Mostly clear, with a low around 25.
Friday
Sunny, with a high near 56.
Friday Night
Mostly clear, with a low around 36.
Saturday
Mostly sunny, with a high near 58.
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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:
12:46 pm CST Feb 22, 2026
Forecast Valid:
2pm CST Feb 22, 2026-6pm CST Feb 28, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation