Congrats and welcome! October is a nice month to get married in Jamaica. I was married nearly 4 years ago (October 20, 2011) at the Gran Bahia Principe Jamaica in Runaway Bay. We loved it, and the Jamaican people. The resort was wonderful, and even though it was only the two of us, they treated us like a king and queen. We were married in the gazebo on the beach and then went off resort for photos afterwards. It rained for about 10 minutes right after our ceremony then it dried up just as quickly. It's still very warm in October - our ceremony was at 1:00 pm - but for some reason that resort and the gazebo have a wonderful breeze that comes in off the water and it's gorgeous.
There are several past and present Jamaica brides on the site so there will be no shortage of information for you to dig up.
Good luck and happy planning!