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.

Overcast

46°F

8°C

Humidity 89%
Wind Speed E 5 mph
Barometer 29.96 in (1014.5 mb)
Dewpoint 43°F (6°C)
Visibility 7.00 mi
Wind Chill44°F (7°C)
Last update 27 Dec 12:54 am CST
Extended Forecast for

Decatur IL

Dense Fog Advisory until December 27, 10:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until December 27, 10:00am

    NOW until 10:00am Sat

    Dense Fog Advisory

  • Overnight

    Low: 42 °F

    Patchy Dense
    Fog

  • Saturday

    Saturday: Patchy dense fog before 9am. Otherwise, cloudy, with a high near 55. Southeast wind 6 to 11 mph, with gusts as high as 21 mph.

    High: 55 °F

    Patchy Dense
    Fog then
    Cloudy

  • Saturday Night

    Saturday Night: A 40 percent chance of showers, mainly after midnight. Cloudy, with a temperature rising to around 60 by 5am. South wind around 11 mph, with gusts as high as 21 mph.

    Low: 53 °F⇑

    Chance
    Showers

  • Sunday

    Sunday: Showers. High near 67. Breezy, with a south southwest wind 10 to 20 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 67 °F

    Showers
    Likely then
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: A 50 percent chance of showers before midnight. Mostly cloudy, with a low around 15. Breezy, with a west northwest wind 21 to 26 mph, with gusts as high as 40 mph.

    Low: 15 °F

    Chance
    Showers and
    Blustery then
    Mostly Cloudy
    and Breezy

  • Monday

    Monday: Partly sunny, with a high near 24. Blustery, with a west northwest wind 20 to 26 mph, with gusts as high as 45 mph.

    High: 24 °F

    Partly Sunny
    and Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around 14. West northwest wind 13 to 18 mph, with gusts as high as 31 mph.

    Low: 14 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 29.

    High: 29 °F

    Mostly Sunny

Detailed Forecast

Overnight
Patchy dense fog. Otherwise, mostly cloudy, with a low around 42. Light and variable wind becoming east around 5 mph.
Saturday
Patchy dense fog before 9am. Otherwise, cloudy, with a high near 55. Southeast wind 6 to 11 mph, with gusts as high as 21 mph.
Saturday Night
A 40 percent chance of showers, mainly after midnight. Cloudy, with a temperature rising to around 60 by 5am. South wind around 11 mph, with gusts as high as 21 mph.
Sunday
Showers. High near 67. Breezy, with a south southwest wind 10 to 20 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
A 50 percent chance of showers before midnight. Mostly cloudy, with a low around 15. Breezy, with a west northwest wind 21 to 26 mph, with gusts as high as 40 mph.
Monday
Partly sunny, with a high near 24. Blustery, with a west northwest wind 20 to 26 mph, with gusts as high as 45 mph.
Monday Night
Mostly clear, with a low around 14. West northwest wind 13 to 18 mph, with gusts as high as 31 mph.
Tuesday
Mostly sunny, with a high near 29.
Tuesday Night
Partly cloudy, with a low around 23.
Wednesday
Partly sunny, with a high near 37.
Wednesday Night
Mostly cloudy, with a low around 17.
New Year's Day
Mostly sunny, with a high near 26.
Thursday Night
Mostly clear, with a low around 10.
Friday
Sunny, with a high near 26.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.84°N 88.94°W (Elev. 692 ft)
Last Update:
1:41 am CST Dec 27, 2025
Forecast Valid:
1am CST Dec 27, 2025-6pm CST Jan 2, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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