When is the best time of the year weather wise to take a cruise to the Bahamas?

I would say whenever the weather is at its absolute worst where you live would be the best time, because the weather doesn't change much in the Bahamas, except if you go in the fall, through about mid-November, there is always the possibility of getting caught in a hurricane. So go in January. August is hot in Florida and you have to go to Florida to go the the Bahamas on a cruise.