First of all, congratulations!!
We'll be there the same week. We will arrive on the 4th. In fact, we may be staying at CBR too, but my husband is keeping that part of the trip a surprise.
Aug is hot and humid. Most days it rains in the afternoon. Crowds are heavy, but with some planning they are manageable. Go early and use pastpass when you can. We usually take a break in the afternoon and go back to the resort to rest, nap, or swim. The heat takes alot of you. We would go back to the parks in the evening.