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

51°F

11°C

Humidity 43%
Wind Speed S 10 mph
Barometer 30.09 in (1019.4 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 13 Feb 4:54 pm CST
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: Increasing clouds, with a low around 33. South wind 3 to 7 mph. Winds could gust as high as 15 mph.

    Low: 33 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 30 percent chance of rain, mainly after noon. Cloudy, with a high near 52. South wind 3 to 6 mph.

    High: 52 °F

    Chance Rain

  • Saturday Night

    Saturday Night: Rain likely, mainly before midnight. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 40. South southeast wind around 6 mph becoming east northeast after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 40 °F

    Rain Likely
    and Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 7am. Otherwise, mostly sunny, with a high near 58. East northeast wind around 6 mph.

    High: 58 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37. Calm wind becoming south around 5 mph after midnight.

    Low: 37 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 59. South wind 5 to 10 mph, with gusts as high as 16 mph.

    High: 59 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42. South wind around 7 mph.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 60.

    High: 60 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 33. South wind 3 to 7 mph. Winds could gust as high as 15 mph.
Saturday
A 30 percent chance of rain, mainly after noon. Cloudy, with a high near 52. South wind 3 to 6 mph.
Saturday Night
Rain likely, mainly before midnight. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 40. South southeast wind around 6 mph becoming east northeast after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 58. East northeast wind around 6 mph.
Sunday Night
Mostly clear, with a low around 37. Calm wind becoming south around 5 mph after midnight.
Washington's Birthday
Partly sunny, with a high near 59. South wind 5 to 10 mph, with gusts as high as 16 mph.
Monday Night
Mostly cloudy, with a low around 42. South wind around 7 mph.
Tuesday
Mostly cloudy, with a high near 60.
Tuesday Night
Mostly cloudy, with a low around 51.
Wednesday
Partly sunny, with a high near 67.
Wednesday Night
Mostly cloudy, with a low around 42.
Thursday
A chance of rain. Partly sunny, with a high near 60.
Thursday Night
A chance of rain. Partly cloudy, with a low around 36.
Friday
Mostly sunny, with a high near 49.
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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:
3:36 pm CST Feb 13, 2026
Forecast Valid:
5pm CST Feb 13, 2026-6pm CST Feb 20, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation