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.

Fair

77°F

25°C

Humidity 47%
Wind Speed NW 9 mph
Barometer 29.95 in (1013.8 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 20 Jun 6:54 pm CDT
Extended Forecast for

Decatur IL

Flood Watch June 21, 07:00am until June 22, 01:00am
Click here for hazard details and duration
Flood Watch

  • Tonight

    Tonight: Increasing clouds, with a low around 61. North northwest wind around 6 mph becoming calm in the evening.

    Low: 61 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Showers and thunderstorms, mainly after 10am. Some of the storms could produce heavy rainfall. High near 75. East southeast wind 7 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

    High: 75 °F

    Heavy Rain

  • Sunday Night

    Sunday Night: Showers and thunderstorms before 2am, then a slight chance of showers between 2am and 4am. Some of the storms could produce heavy rainfall. Low around 62. Southeast wind 10 to 15 mph becoming north northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 62 °F

    Heavy Rain
    then Chance
    Showers

  • Monday

    Monday: Mostly cloudy, with a high near 73. North wind 11 to 13 mph, with gusts as high as 20 mph.

    High: 73 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly clear, with a low around 55. North northeast wind 5 to 9 mph, with gusts as high as 15 mph.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 77. North northeast wind 3 to 5 mph.

    High: 77 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 59. Light and variable wind.

    Low: 59 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 61. North northwest wind around 6 mph becoming calm in the evening.
Sunday
Showers and thunderstorms, mainly after 10am. Some of the storms could produce heavy rainfall. High near 75. East southeast wind 7 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Sunday Night
Showers and thunderstorms before 2am, then a slight chance of showers between 2am and 4am. Some of the storms could produce heavy rainfall. Low around 62. Southeast wind 10 to 15 mph becoming north northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Monday
Mostly cloudy, with a high near 73. North wind 11 to 13 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 55. North northeast wind 5 to 9 mph, with gusts as high as 15 mph.
Tuesday
Sunny, with a high near 77. North northeast wind 3 to 5 mph.
Tuesday Night
Mostly clear, with a low around 59. Light and variable wind.
Wednesday
Mostly sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 59.
Thursday
Mostly sunny, with a high near 78.
Thursday Night
Partly cloudy, with a low around 59.
Friday
Mostly sunny, with a high near 80.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 62.
Saturday
A chance of showers. Partly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.86°N 88.94°W (Elev. 682 ft)
Last Update:
6:11 pm CDT Jun 20, 2026
Forecast Valid:
7pm CDT Jun 20, 2026-6pm CDT Jun 27, 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