To what ports is the cruise? Your departure in FL might be a little cool, as may any days in the Bahamas or Key West. However, if you are in the USVI area (St Thomas, San Juan, etc) or the Mexico area (Cozumel, Belize, etc.) then you should have no problems and the weather should be in the low to mid 80s. Go to weather.com and type the name of a city you will be visiting. Click on averages and you will see what the weather usually is like during that time of the year.