A heat advisory is in effect for Darien and the surrounding earea through 9 p.m. Sunday.
The heat index value could be as high as 104 degrees as per the National Weather Service. A heat advisory is issued when the combination of heat and humidity is expected to make it feel like it is 95 to 99 degrees for two or more consecutive days, or 100 to 104 degrees for any length of time. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. In cases of heat stroke call 911.