 I assume it's what it actually feels like. You combine the heat, the temperature in the air, the humidity, and it's feeling a lot hotter than it should be right now. I tell you that. That's oddly precise. 7 News first alert meteorologist Mark Pena explains it's calculated with a pretty complicated formula, but it's pretty simple when you break it down. That's what the feels like temperature, that heat index is. It's that temperature your body really feels as opposed to just the air temperature.