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

37°F

3°C

Humidity 82%
Wind Speed NW 9 mph
Barometer 29.94 in (1014.3 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 31 Dec 11:54 pm CST
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 21. North wind 8 to 10 mph, with gusts as high as 18 mph.

    Low: 21 °F

    Mostly Cloudy

  • New Year's Day

    New Year's Day: Mostly sunny, with a high near 30. North northeast wind 5 to 8 mph becoming calm in the morning.

    High: 30 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 21. Calm wind.

    Low: 21 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 35. Calm wind becoming northeast around 6 mph in the afternoon.

    High: 35 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 23. Northeast wind around 6 mph.

    Low: 23 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 36. Northeast wind around 5 mph becoming light and variable.

    High: 36 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 21. North northwest wind around 5 mph becoming calm in the evening.

    Low: 21 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 29.

    Low: 29 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 21. North wind 8 to 10 mph, with gusts as high as 18 mph.
New Year's Day
Mostly sunny, with a high near 30. North northeast wind 5 to 8 mph becoming calm in the morning.
Thursday Night
Partly cloudy, with a low around 21. Calm wind.
Friday
Partly sunny, with a high near 35. Calm wind becoming northeast around 6 mph in the afternoon.
Friday Night
Mostly cloudy, with a low around 23. Northeast wind around 6 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 36. Northeast wind around 5 mph becoming light and variable.
Saturday Night
Mostly clear, with a low around 21. North northwest wind around 5 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 37.
Sunday Night
Partly cloudy, with a low around 29.
Monday
Mostly sunny, with a high near 50.
Monday Night
Partly cloudy, with a low around 35.
Tuesday
Partly sunny, with a high near 53.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
Mostly sunny, with a high near 47.
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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:
11:37 pm CST Dec 31, 2025
Forecast Valid:
12am CST Jan 1, 2026-6pm CST Jan 7, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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