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.

Light Rain

75°F

24°C

Humidity 90%
Wind Speed N 7 mph
Barometer 30.01 in (1015.8 mb)
Dewpoint 72°F (22°C)
Visibility 9.00 mi
Last update 13 Jul 5:54 pm CDT
Extended Forecast for

Decatur IL

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly before 9pm. Patchy fog after 3am. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 68. Southeast wind around 6 mph becoming calm in the evening.

    Low: 68 °F

    Chance
    T-storms then
    Patchy Fog

  • Monday

    Monday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 86. Calm wind becoming east around 5 mph.

    High: 86 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 70. Light and variable wind.

    Low: 70 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88. Light and variable wind becoming south southeast around 6 mph in the morning.

    High: 88 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 72. South wind 3 to 6 mph.

    Low: 72 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Southwest wind 6 to 8 mph.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. South southwest wind around 7 mph.

    Low: 73 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 71.

    Low: 71 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms, mainly before 9pm. Patchy fog after 3am. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 68. Southeast wind around 6 mph becoming calm in the evening.
Monday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 86. Calm wind becoming east around 5 mph.
Monday Night
Partly cloudy, with a low around 70. Light and variable wind.
Tuesday
A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88. Light and variable wind becoming south southeast around 6 mph in the morning.
Tuesday Night
Mostly cloudy, with a low around 72. South wind 3 to 6 mph.
Wednesday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Southwest wind 6 to 8 mph.
Wednesday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. South southwest wind around 7 mph.
Thursday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.
Thursday Night
A 40 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 71.
Friday
A 40 percent chance of showers after 1pm. Partly sunny, with a high near 85.
Friday Night
Mostly cloudy, with a low around 70.
Saturday
A chance of showers. Mostly sunny, with a high near 87.
Saturday Night
Partly cloudy, with a low around 70.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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:
6:12 pm CDT Jul 13, 2025
Forecast Valid:
6pm CDT Jul 13, 2025-6pm CDT Jul 20, 2025
 
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