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

69°F

21°C

Humidity 87%
Wind Speed N 7 mph
Barometer 29.96 in (1014.1 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 25 Jun 1:54 am CDT
Extended Forecast for

Decatur IL

Flood Watch June 25, 04:00pm until June 27, 01:00pm
Click here for hazard details and duration
Flood Watch

  • Overnight

    Overnight: A 40 percent chance of showers before 4am. Mostly cloudy, with a low around 64. Light west southwest wind.

    Low: 64 °F

    Chance
    Showers

  • Thursday

    Thursday: Mostly cloudy, with a high near 81. West southwest wind 3 to 6 mph.

    High: 81 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3am. Mostly cloudy, with a low around 64. Calm wind becoming east around 6 mph after midnight. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 64 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: Showers, with thunderstorms also possible after 1pm. Some of the storms could produce heavy rainfall. High near 75. East wind around 10 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    High: 75 °F

    Heavy Rain

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind 5 to 9 mph becoming north northeast after midnight. Chance of precipitation is 50%.

    Low: 65 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly cloudy, with a high near 83. East northeast wind around 5 mph becoming south southeast in the afternoon.

    High: 83 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. South southeast wind 5 to 7 mph.

    Low: 69 °F

    Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

Detailed Forecast

Overnight
A 40 percent chance of showers before 4am. Mostly cloudy, with a low around 64. Light west southwest wind.
Thursday
Mostly cloudy, with a high near 81. West southwest wind 3 to 6 mph.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3am. Mostly cloudy, with a low around 64. Calm wind becoming east around 6 mph after midnight. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Showers, with thunderstorms also possible after 1pm. Some of the storms could produce heavy rainfall. High near 75. East wind around 10 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind 5 to 9 mph becoming north northeast after midnight. Chance of precipitation is 50%.
Saturday
Mostly cloudy, with a high near 83. East northeast wind around 5 mph becoming south southeast in the afternoon.
Saturday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. South southeast wind 5 to 7 mph.
Sunday
Mostly sunny, with a high near 91.
Sunday Night
Mostly clear, with a low around 74.
Monday
Sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Sunny, with a high near 94.
Tuesday Night
Clear, with a low around 74.
Wednesday
Sunny, with a high near 94.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Decatur IL
 39.86°N 88.94°W (Elev. 682 ft)
Last Update:
1:36 am CDT Jun 25, 2026
Forecast Valid:
2am CDT Jun 25, 2026-6pm CDT Jul 1, 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