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 66%
Wind Speed SE 9 mph
Barometer 29.92 in (1012.7 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 21 Jun 8:54 am CDT
Extended Forecast for

Hammond IL

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

    NOW until 1:00am Mon

    Flood Watch

  • Today

    High: 74 °F

    Heavy Rain

  • Tonight

    Tonight: A chance of showers and thunderstorms. Some of the storms could produce heavy rainfall. Cloudy, with a low around 59. South southeast wind 10 to 15 mph becoming northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 50%.

    Low: 59 °F

    Heavy Rain
    then Chance
    Showers

  • Monday

    Monday: A 20 percent chance of showers before 9am. Mostly cloudy, with a high near 73. North wind around 15 mph, with gusts as high as 22 mph.

    High: 73 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 53. North northeast wind 6 to 11 mph, with gusts as high as 15 mph.

    Low: 53 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 77. North northeast wind 3 to 6 mph.

    High: 77 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 57. Light and variable wind.

    Low: 57 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 79. Light and variable wind becoming southwest 5 to 7 mph in the morning.

    High: 79 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 60.

    Low: 60 °F

    Partly Cloudy

Detailed Forecast

Today
Showers and thunderstorms, mainly after 1pm. Some of the storms could produce heavy rainfall. High near 74. Southeast wind 9 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Tonight
A chance of showers and thunderstorms. Some of the storms could produce heavy rainfall. Cloudy, with a low around 59. South southeast wind 10 to 15 mph becoming northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 50%.
Monday
A 20 percent chance of showers before 9am. Mostly cloudy, with a high near 73. North wind around 15 mph, with gusts as high as 22 mph.
Monday Night
Mostly clear, with a low around 53. North northeast wind 6 to 11 mph, with gusts as high as 15 mph.
Tuesday
Sunny, with a high near 77. North northeast wind 3 to 6 mph.
Tuesday Night
Mostly clear, with a low around 57. Light and variable wind.
Wednesday
Mostly sunny, with a high near 79. Light and variable wind becoming southwest 5 to 7 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 60.
Thursday
Mostly sunny, with a high near 79.
Thursday Night
Mostly clear, with a low around 59.
Friday
A chance of showers. 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 and thunderstorms. Mostly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hammond IL
 39.81°N 88.6°W (Elev. 673 ft)
Last Update:
9:16 am CDT Jun 21, 2026
Forecast Valid:
9am CDT Jun 21, 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