We have been on three cruises so far at this time of the year and the weather has always been very warm. We are going on the same cruise this year as you are , i believe that it will be cold on deck leaving from new york but after a couple of days we will be in the caribbean and hopefully have lovely warm weather. Have a great cruise. Lind.
I was in the Caribbean over the same week in 2006. The weather was fantastic, at night there was rainfall over land, which doesn't bother you when your sailing over night. What it does mean is that it can be slightly damp when you dock in port. This also can affect some of the waterfall tours, the main ones are either closed or have limited access, so any specific fall you want to see, get earliest excursion possible. got to say, the starry nights are the most amazing I have ever seen!
I went round Caribbean same time last year. Weather is very warm. Obviously like anywhere else, there are likely to be showers or wind, especially mid ocean. You will need lots of light summer wear, but do remember to take a wrap or jacket, or tops with sleeves for the evenings as the ships get quite chilly with the air conditioning at night.
It will be great......have no worries you will both enjoy .