The cooler weather along with recent rains have cooled the water, bringing the surface temp to 72 degrees (according to my Lawrence, which I don't trust too much). The rains have also caused the water to become quite muddy. 3 hours of trolling produced absolutely nothing.
I also noticed that a lot of the surface weeds are gone. I'm not sure if that is due to the rains, winds, temps or what, but they sure aren't there like they were a few weeks ago.