You have to bonk the fish on the nose to get them to eat. Fish the medium speed runs, the faster runs are hard to get your fly down to the fish. Also, try some streamers on both floating and sink tip lines. A few small caddis showing in the late afternoon. Putah Creek is just one hour from the Bay Area.
Fishing is fair.
This is big fish time of year. Use 7 to 9 wt rods with medium sink shooting heads and dark streamers on a slow retrieve. Good areas have been Warrior Point, the Nets, and Howard Bay. Fishing is spotty, the steelhead run is about over. Try Wolher Bridge and Cassini's Ranch, and the mouth of Dry Creek.