I am trying to figure out the same thing. I guess it really depends on what we want? I am thinking of doing it at around 4:00pm in October, as sunset is around 6pm...I wanted the cocktail reception to be at sunset...and into a private dinner, but its all what you want right? That sounds like a really relaxing day to do it the way you described above!!! I would suggest checking to see how hot it gets at that time during July? that might play a part in what time works best for you! Either way, good luck, and I am sure it will be great!