We were at CTI Nov 15-22 last year and going to CSA Nov 14-21 this year. Last year the weather was about as perfect as it could have been. We can't wait to go back! I've heard that October is a rainier month, so hopefully by the 5th all of that will have passed. It will still be beautiful and amazing regardless of the weather. I highly doubt it would rain all day every day. If anything, maybe a shower in the early afternoon. Congrats!
We were married 11/11/08 at CN on the beach. Although the wedding area is adjacent to the AN area of the resort there is a shrub that surrounds that area and conceals it from the Beach wedding area. We will be returning 11/11/11 to renew our vows on the beach at CN.
I would say I prefer it to CSA just due to the fact that the beach can be shallow at points at CSA and the beach area set up we saw when there did not seem as private as at CN Matter of personal preference too though. This will be out 5th trip at Couples over the last 10 years.
To answer your question, the weather should be great. If it does rain in the afternoon, it will be short and usually over well before sunset... pretty typical of the Caribbean this time of year. 86 degrees every day and 79 degrees every night. Not sure how AN came up, but we saw a wedding our first night ever at CN and we didn't even realize the AN portion was there until our 3rd day. Not an issue.