What is the Heat Index?

The heat index, also known as the apparent temperature or “feels like” temperature, is a measure that combines the actual air temperature and relative humidity to reflect how hot it feels to the human body. When it's humid, our bodies have a harder time cooling down through sweating because the sweat doesn't evaporate as quickly.
For example, if the temperature was 94 degrees Fahrenheit, with a relative humidity of 62%, the heat index would be 112 degrees Fahrenheit -- meaning that the air feels like 112 degrees Fahrenheit to our bodies.
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[@johncarter1150]

Wind should be a factor in determining heat index.

[@richardbulva]

Weather forecasts/app that want to be serious take wind into factor. This video is simplified.