It was that hot here in the US east coast last week. I was barefoot the whole time but if the unhardened part of my soles touched the blacktop I felt it.
Well it got very slightly cooler towards early evening making the pavements bearable, so I had a walk down to the shops to buy some beer. Still hot underfoot but in a good way. When I got back I was invited round to my neighbours house for an impromptu barbecue, quite a few people there on her back patio, and every single one barefoot. Nice. Got talking to a woman from down the street with very pretty feet, I've obviously never seen her barefoot before. She asked me about why I go barefoot, seemed quite interested and thought it was a cool thing to do. This morning after a hot uncomfortable night, I went out at 5am for a couple of miles around town, it felt wonderful. Not going to be as hot today so lots of barefooting to come.