Fishing should improve as fall arrives. Terrestrial fishing is often an early September event here, especially on Duck, Hope, and Mitten. Ants and beetles can be good choices when windy weather blows them onto the lake. You don't have to have a boat; fishing from shore can be decent.
Expect evening caddis activity to continue for a while; try a Goddard Caddis. The traveling sedges are done.
Damselfly patterns, scuds, and waterboatman imitations are effective.
Leeches will be effective most of the day as the water cools down. Try brown or olive Mohair Leeches. Brown trout will be thinking about the spawning season, which means streamers will be useful.
Midges in size 16-20 will become important this month, too.
For more on September tactics and flies, see the Lakes in General forecast