The weather in the Med in Oct/Nov can be very changeable. Last year we arrived in Rome 21 Oct. The weather for the three days in Rome was beautiful with temps in the mid to high 70s. It was even a bit uncomfortable walking at times, which we did a lot of. We boarded Diamond 25 Oct at Cavitavecchia and the trip to Livorno was good, but late in the afternoon in Livorno we had heavy thunderstorms that lasted well into the night. Next stop was Monaco and the morning was in the high 60s, but it was in the mid 70s by afternoon. Same in Barcelona, Malaga, and Cadiz. It was a bit cooler in Lisbon and we had some rain, but not enough to preclude touring Sintra, et al. Funchal was nice in the AM, but we had rain in the PM with temps in the low 70s. The Transatlantic trip to San Juan was 70s all the way with a little intermittent rain a couple of days. As we approached San Juan the temps went up to the 80s. Definitely carry an umbrella in the Med, regardless of what the morning looks like, because the weather can change very quickly.