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.

Fog/Mist

68°F

20°C

Humidity 96%
Wind Speed E 3 mph
Barometer 29.89 in (1011.6 mb)
Dewpoint 67°F (19°C)
Visibility 4.00 mi
Last update 13 Aug 5:54 am CDT
Extended Forecast for

Hammond IL

Dense Fog Advisory until August 13, 09:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory until August 13, 09:00am

    NOW until 9:00am Thu

    Dense Fog Advisory

  • Today

    High: 85 °F

    Chance
    T-storms and
    Patchy Dense
    Fog

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 71. East wind 8 to 11 mph, with gusts as high as 21 mph.

    Low: 71 °F

    Chance
    T-storms

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms, mainly before 10am. Cloudy, then gradually becoming mostly sunny, with a high near 89. Heat index values as high as 102. Southeast wind 8 to 10 mph, with gusts as high as 18 mph.

    High: 89 °F

    Chance
    Showers then
    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 72. East northeast wind around 8 mph.

    Low: 72 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 91. Southeast wind around 9 mph becoming south southwest in the afternoon.

    High: 91 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 74. South wind around 8 mph.

    Low: 74 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 90. West northwest wind 8 to 10 mph, with gusts as high as 15 mph.

    High: 90 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 69. Chance of precipitation is 40%.

    Low: 69 °F

    Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly between noon and 3pm. Patchy dense fog before 9am. Otherwise, mostly cloudy, with a high near 85. East wind 5 to 9 mph.
Tonight
A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 71. East wind 8 to 11 mph, with gusts as high as 21 mph.
Friday
A 50 percent chance of showers and thunderstorms, mainly before 10am. Cloudy, then gradually becoming mostly sunny, with a high near 89. Heat index values as high as 102. Southeast wind 8 to 10 mph, with gusts as high as 18 mph.
Friday Night
Partly cloudy, with a low around 72. East northeast wind around 8 mph.
Saturday
Mostly sunny, with a high near 91. Southeast wind around 9 mph becoming south southwest in the afternoon.
Saturday Night
Partly cloudy, with a low around 74. South wind around 8 mph.
Sunday
Mostly sunny, with a high near 90. West northwest wind 8 to 10 mph, with gusts as high as 15 mph.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 69. Chance of precipitation is 40%.
Monday
Partly sunny, with a high near 83.
Monday Night
Partly cloudy, with a low around 63.
Tuesday
Sunny, with a high near 83.
Tuesday Night
Mostly clear, with a low around 65.
Wednesday
Mostly sunny, with a high near 86.
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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:
5:26 am CDT Aug 13, 2026
Forecast Valid:
6am CDT Aug 13, 2026-6pm CDT Aug 19, 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