Yeah that is hot but there are 2 kinds of hot. High temp and low humidity and high temps and high humidity.
It will be 90 F with 75% humidity, so you sweat all you want and it won't help!
As far as running goes we train in the heat and our times are awful. My wife is in Minnesota this week and she dropped a minute off all her times!!!
I did get a wetsuit this year and haven't worn it yet. When that water temp hits 79F it is coming out!!! I guess having bath water (85F) will spoil ya. One reason that water here is so warm is the lakes around here are SHALLOW so there is not a large volume of water to warm even if the surface area is large. And of course having a large surface area helps to heat it even more. The deepest I ever seen on my dept finder is 12ft with the norm being around 8ft.