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.

Overcast

46°F

8°C

Humidity 58%
Wind Speed S 6 mph
Barometer 29.97 in (1015.4 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 14 Feb 2:54 pm CST
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: Rain likely, mainly after 5pm. Cloudy, with a high near 48. South southeast wind around 8 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 48 °F

    Rain Likely

  • Tonight

    Tonight: Rain, mainly before 5am. Patchy fog after 4am. Low around 42. Southeast wind 6 to 8 mph becoming northeast after midnight. Winds could gust as high as 17 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 42 °F

    Rain and
    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 58. Northeast wind around 8 mph becoming northwest in the afternoon.

    High: 58 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 37. Calm wind becoming south southwest around 5 mph after midnight.

    Low: 37 °F

    Increasing
    Clouds

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 60. South southwest wind 6 to 11 mph, with gusts as high as 21 mph.

    High: 60 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 43. South wind around 9 mph, with gusts as high as 17 mph.

    Low: 43 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 62. South wind 8 to 15 mph, with gusts as high as 25 mph.

    High: 62 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 67. Breezy.

    High: 67 °F

    Sunny and
    Breezy

Detailed Forecast

This Afternoon
Rain likely, mainly after 5pm. Cloudy, with a high near 48. South southeast wind around 8 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Rain, mainly before 5am. Patchy fog after 4am. Low around 42. Southeast wind 6 to 8 mph becoming northeast after midnight. Winds could gust as high as 17 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 58. Northeast wind around 8 mph becoming northwest in the afternoon.
Sunday Night
Increasing clouds, with a low around 37. Calm wind becoming south southwest around 5 mph after midnight.
Washington's Birthday
Partly sunny, with a high near 60. South southwest wind 6 to 11 mph, with gusts as high as 21 mph.
Monday Night
Mostly cloudy, with a low around 43. South wind around 9 mph, with gusts as high as 17 mph.
Tuesday
Mostly cloudy, with a high near 62. South wind 8 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 55.
Wednesday
Sunny, with a high near 67. Breezy.
Wednesday Night
Mostly clear, with a low around 42.
Thursday
A chance of rain. Mostly sunny, with a high near 64.
Thursday Night
A chance of rain. Partly cloudy, with a low around 36.
Friday
Mostly sunny, with a high near 48.
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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 14, 2026
Forecast Valid:
3pm CST Feb 14, 2026-6pm CST Feb 20, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation