Q. Will this heat damage plants?
A. Most likely not. If the plants have been in the ground for a few years, then they are acclimated or have become accustomed to it. The problems come from those plants recently planted or planted during the heat. Flowering plants need six to eight hours of sunlight every day. Non flowering plants can get by with less.
Your choice, when they are planted, is whether these plants should get morning sun (primarily east or north sides) or afternoon sun (south or west sides). If they are growing successfully in a location you’ve chosen for them, then don’t move them.