Hit Walden Pond last night for an hour or so before the gates closed. A few fish (including one very large carp) were hitting very small midges on the surface, but nothing consistent. No hookups for me, but I ran into another fly fisherman who managed a brown, a few rainbows, and a few smallmouth all on a slowly retrieved nymph. Saw a few bait soakers near the beach but they caught noithing while I was there. I think a canoe and a sinking line might get you into a some nice fish.
The water is definitely cooling off, but I would guess it was still in the low 60's in the shallows.