National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

43°F

6°C

Humidity 93%
Wind Speed W 3 mph
Barometer 30.00 in (1016.1 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 15 Feb 7:54 pm CST
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 39. Southwest wind 3 to 7 mph.

    Low: 39 °F

    Mostly Clear
    then Patchy
    Fog

  • Washington's Birthday

    Washington's Birthday: Patchy fog before 10am. Otherwise, partly sunny, with a high near 61. South southwest wind 7 to 14 mph, with gusts as high as 23 mph.

    High: 61 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 41. South wind around 9 mph, with gusts as high as 16 mph.

    Low: 41 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 60. South wind 8 to 17 mph, with gusts as high as 28 mph.

    High: 60 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 55. Breezy, with a south wind 17 to 22 mph, with gusts as high as 32 mph.

    Low: 55 °F

    Breezy.
    Mostly Cloudy
    then Chance
    Rain

  • Wednesday

    Wednesday: Sunny, with a high near 68. Breezy, with a west southwest wind 13 to 20 mph, with gusts as high as 30 mph.

    High: 68 °F

    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43. West southwest wind 6 to 10 mph becoming east southeast after midnight. Winds could gust as high as 16 mph.

    Low: 43 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of rain after noon. Mostly sunny, with a high near 67.

    High: 67 °F

    Partly Sunny
    then Chance
    Rain

  • Thursday Night

    Thursday Night: A 30 percent chance of rain before midnight. Partly cloudy, with a low around 37.

    Low: 37 °F

    Chance Rain
    then Partly
    Cloudy

Detailed Forecast

Tonight
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 39. Southwest wind 3 to 7 mph.
Washington's Birthday
Patchy fog before 10am. Otherwise, partly sunny, with a high near 61. South southwest wind 7 to 14 mph, with gusts as high as 23 mph.
Monday Night
Partly cloudy, with a low around 41. South wind around 9 mph, with gusts as high as 16 mph.
Tuesday
Mostly cloudy, with a high near 60. South wind 8 to 17 mph, with gusts as high as 28 mph.
Tuesday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 55. Breezy, with a south wind 17 to 22 mph, with gusts as high as 32 mph.
Wednesday
Sunny, with a high near 68. Breezy, with a west southwest wind 13 to 20 mph, with gusts as high as 30 mph.
Wednesday Night
Partly cloudy, with a low around 43. West southwest wind 6 to 10 mph becoming east southeast after midnight. Winds could gust as high as 16 mph.
Thursday
A 30 percent chance of rain after noon. Mostly sunny, with a high near 67.
Thursday Night
A 30 percent chance of rain before midnight. Partly cloudy, with a low around 37.
Friday
Mostly sunny, with a high near 49.
Friday Night
A chance of rain. Partly cloudy, with a low around 28.
Saturday
Mostly sunny, with a high near 45.
Saturday Night
Mostly clear, with a low around 24.
Sunday
Mostly sunny, with a high near 41.
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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:
7:26 pm CST Feb 15, 2026
Forecast Valid:
8pm CST Feb 15, 2026-6pm CST Feb 22, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation