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Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

65°F

18°C

Humidity 84%
Wind Speed NA
Barometer 29.98 in (1014.7 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 19 May 1:54 am CDT
Extended Forecast for

Decatur IL

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 65. South wind around 13 mph, with gusts as high as 24 mph.

    Low: 65 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 79. South southwest wind 11 to 16 mph, with gusts as high as 26 mph.

    High: 79 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms before 3am, then a slight chance of showers after 4am. Mostly cloudy, with a low around 54. Northwest wind 9 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 54 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Partly sunny, with a high near 67. North northeast wind around 11 mph, with gusts as high as 20 mph.

    High: 67 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 46. Northeast wind 10 to 14 mph, with gusts as high as 20 mph.

    Low: 46 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 69. East wind 11 to 13 mph, with gusts as high as 21 mph.

    High: 69 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 53. East wind 11 to 13 mph, with gusts as high as 20 mph.

    Low: 53 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 68. Chance of precipitation is 70%.

    High: 68 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 56.

    Low: 56 °F

    Chance
    Showers

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 65. South wind around 13 mph, with gusts as high as 24 mph.
Tuesday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 79. South southwest wind 11 to 16 mph, with gusts as high as 26 mph.
Tuesday Night
A slight chance of showers and thunderstorms before 3am, then a slight chance of showers after 4am. Mostly cloudy, with a low around 54. Northwest wind 9 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Wednesday
Partly sunny, with a high near 67. North northeast wind around 11 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 46. Northeast wind 10 to 14 mph, with gusts as high as 20 mph.
Thursday
Partly sunny, with a high near 69. East wind 11 to 13 mph, with gusts as high as 21 mph.
Thursday Night
A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 53. East wind 11 to 13 mph, with gusts as high as 20 mph.
Friday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 68. Chance of precipitation is 70%.
Friday Night
A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 56.
Saturday
Mostly cloudy, with a high near 76.
Saturday Night
Mostly cloudy, with a low around 58.
Sunday
Partly sunny, with a high near 80.
Sunday Night
Mostly cloudy, with a low around 61.
Memorial Day
A chance of showers. Mostly cloudy, with a high near 81.
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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:
1:26 am CDT May 19, 2026
Forecast Valid:
2am CDT May 19, 2026-6pm CDT May 25, 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