I think when you are dealing with that kind of temperature ( in excess of 30 degrees or very high humid conditions ) you need to keep the body cool.
In most places in Canada there are not too many places that have the kind of heat I experienced in Australia.
Our summers in Toronto ( with the exception of this past one;( ) it typically can get very hot and when we finished speed sessions or extensive tempo a rinse in warm to get clean but then the colder the better to get the body temperature back to normal as soon as possible so the energy is spent bouncing back for the next days training or maybe the next session later that day.
Does anyone who lives close to the ocean take advantage of it the way Charlie used to encourage people to do? Just curious