In my experience this type of cool down in August can be absolutely great fishing. It's as if the fish get extremely happy after having to survive the warm temps for the entire summer. Imagine you are finally comfortable, and can breathe well again after a couple months. The fish are going to eat!
Let me know if you want to get on the water. I have not done any trips for the past two weeks due to poor conditions, but now its time to get back after it.