Jigs work great for summer steelhead. I usually use the 1/8 oz. size and fish solid colors like Black, Pink, Red or Purple. One technique that has worked well for me is after working a hole with a color for a while, I'll tie on a different color. Usually the first cast with that new color will produce a bobber down. I also try to vary jig depth every few casts. Sometimes this is all it takes to get a strike.
Good luck, Wog