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

26°F

-3°C

Humidity 75%
Wind Speed SW 12 mph
Barometer 30.31 in (1027.3 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill15°F (-9°C)
Last update 12 Jan 3:54 am CST
Extended Forecast for

Decatur IL

  • Today

    Today: Mostly sunny, with a high near 46. Southwest wind 7 to 13 mph, with gusts as high as 25 mph.

    High: 46 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 34. South southwest wind 7 to 10 mph, with gusts as high as 18 mph.

    Low: 34 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 53. West southwest wind 10 to 16 mph, with gusts as high as 28 mph.

    High: 53 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 34. West wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of rain and snow showers between noon and 3pm, then a chance of snow showers after 3pm. Mostly cloudy, with a temperature falling to around 29 by 5pm. Breezy, with a northwest wind 14 to 19 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 38 mph. Chance of precipitation is 30%.

    High: 40 °F⇓

    Breezy.
    Mostly Cloudy
    then Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 15. Blustery, with a north northwest wind 15 to 21 mph, with gusts as high as 33 mph.

    Low: 15 °F

    Mostly Cloudy
    and Blustery
    then Partly
    Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 28. North northwest wind 7 to 14 mph becoming west in the afternoon. Winds could gust as high as 20 mph.

    High: 28 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of snow showers before midnight. Mostly cloudy, with a low around 21.

    Low: 21 °F

    Chance Snow
    Showers then
    Mostly Cloudy

  • Friday

    Friday: A 40 percent chance of snow showers after noon. Mostly cloudy, with a high near 37.

    High: 37 °F

    Mostly Cloudy
    then Chance
    Snow Showers

Detailed Forecast

Today
Mostly sunny, with a high near 46. Southwest wind 7 to 13 mph, with gusts as high as 25 mph.
Tonight
Partly cloudy, with a low around 34. South southwest wind 7 to 10 mph, with gusts as high as 18 mph.
Tuesday
Increasing clouds, with a high near 53. West southwest wind 10 to 16 mph, with gusts as high as 28 mph.
Tuesday Night
Mostly cloudy, with a low around 34. West wind 10 to 13 mph, with gusts as high as 21 mph.
Wednesday
A chance of rain and snow showers between noon and 3pm, then a chance of snow showers after 3pm. Mostly cloudy, with a temperature falling to around 29 by 5pm. Breezy, with a northwest wind 14 to 19 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 38 mph. Chance of precipitation is 30%.
Wednesday Night
Partly cloudy, with a low around 15. Blustery, with a north northwest wind 15 to 21 mph, with gusts as high as 33 mph.
Thursday
Mostly sunny, with a high near 28. North northwest wind 7 to 14 mph becoming west in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
A 30 percent chance of snow showers before midnight. Mostly cloudy, with a low around 21.
Friday
A 40 percent chance of snow showers after noon. Mostly cloudy, with a high near 37.
Friday Night
Mostly cloudy, with a low around 16.
Saturday
Partly sunny, with a high near 24.
Saturday Night
Mostly cloudy, with a low around 6.
Sunday
Mostly sunny, with a high near 22.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
3:24 am CST Jan 12, 2026
Forecast Valid:
4am CST Jan 12, 2026-6pm CST Jan 18, 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