Good read on trout and water temp:
https://www.hatchmag.com/articles/trout-and-water-temperature-how-hot-too-hot/771553


They don't go species by species, but around here Brown trout stay active longest into summer followed by rainbows, so I wouldn't be surprised if there is some difference in the temperatures for those 2. Brook trout are almost impossible to catch once we get into summer, so I assume they deal with warm water worse than the other 2 species.