The warmer water means that swinging a size 6 Lady Caroline on a dry line is preferred to dredging with tips and large flies. Easier casting usually equates to longer more controlled casts, and thus a better opportunity to properly present a fly in front of a steelhead. If you couple the easier casting with the larger number of grabby fish, you get.......happy bends in rods.
Now let's talk a little about the smaller cousin of the summer steelhead (Oncorhynchus mykiss), The sea run Cutthroat (Oncorhynchus clarki). These guys may not be as big as steelhead, but they fight as hard if not harder than any steelhead. They are also veracious grabbers of the fly. These guys can make for a very very fun day. It is not uncommon to have a double digit day on cutthroat. And this is being conservative.
This time of year, I like to fish for both mykiss, and clarki with my clients. Fishing heads and back eddys for cutthroat, and swinging the run for steelhead. Combine this with a nice stream side lunch and you have the makings of a very very good day on the water.