We seldom get enough sun here to be a great concern
Having said that, these past few summers have been warmer, and we have just recently had a week or so with temperatures in the high 70's/80's F (about 25/27 C)?
The leaves do scorch a little if the sun is blistering hot. My own trees have some shade here and there ... the Seiryu however would be in full sun (such as we get) almost all day ...
Try to plant trees which are more susceptible to direct sunlight (if your sun is inclined to be strong) in a dappled shade position or at least where they will not get the worst of the sunlight during the day