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.

A Few Clouds

29°F

-2°C

Humidity 66%
Wind Speed NE 8 mph
Barometer 29.95 in (1015.0 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 2 Jan 11:54 am CST
Extended Forecast for

Decatur IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 33. North northeast wind around 7 mph.

    High: 33 °F

    Mostly Cloudy

  • Tonight

    Tonight: Cloudy, with a low around 24. Northeast wind around 7 mph.

    Low: 24 °F

    Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 36. Northeast wind 5 to 7 mph becoming northwest in the afternoon.

    High: 36 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 20. Northwest wind around 5 mph becoming calm in the evening.

    Low: 20 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 36. Calm wind becoming south southeast around 6 mph in the afternoon.

    High: 36 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly cloudy during the early evening, then gradual clearing, with a low around 29. South southeast wind 6 to 10 mph, with gusts as high as 18 mph.

    Low: 29 °F

    Gradual
    Clearing

  • Monday

    Monday: Mostly sunny, with a high near 50. South southwest wind 7 to 10 mph, with gusts as high as 17 mph.

    High: 50 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 56.

    High: 56 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 33. North northeast wind around 7 mph.
Tonight
Cloudy, with a low around 24. Northeast wind around 7 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 36. Northeast wind 5 to 7 mph becoming northwest in the afternoon.
Saturday Night
Mostly clear, with a low around 20. Northwest wind around 5 mph becoming calm in the evening.
Sunday
Increasing clouds, with a high near 36. Calm wind becoming south southeast around 6 mph in the afternoon.
Sunday Night
Mostly cloudy during the early evening, then gradual clearing, with a low around 29. South southeast wind 6 to 10 mph, with gusts as high as 18 mph.
Monday
Mostly sunny, with a high near 50. South southwest wind 7 to 10 mph, with gusts as high as 17 mph.
Monday Night
Mostly cloudy, with a low around 38.
Tuesday
Mostly sunny, with a high near 56.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
Mostly sunny, with a high near 55.
Wednesday Night
Mostly cloudy, with a low around 43.
Thursday
A chance of rain. Mostly cloudy, with a high near 57.
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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:
12:13 pm CST Jan 2, 2026
Forecast Valid:
12pm CST Jan 2, 2026-6pm CST Jan 8, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation