We were on the Carnival Legend 28 September. The weather was drizzle, damp and overcast. The sailing was a little rough the first night out but nothing to really wory about. We had packed some warmer clothes thinking it would be cold until we got to Florida. Not the case. The next morning I was in shorts sitting by the pool.
The nice thing about it beside the not flying (we took a train from Boston) was the sea days which we like. Also got to see the Statue of Liberty and the New York skyline.
On the return trip the weather was beautiful.
We love this not flying, my wife because she hates to fly and me because I save on 1st class flight, so we have booked a RCCL cruise out of Boston next September to Bermuda and Easten Caribbean.