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Sorry. Couldn't resist that! Obviously NOBODY can tell you EXACTLY what the weather will be like at a specific time, either day or night ANYWHERE in the world. You don't even say WHERE in the Caribbean you are asking about? Having said this, the weather pretty obviously should be hot and sunny, though probably quite windy at that time of year. This is the prime time to visit the caribbean, and for an obvious reason! The weather is usually hot, sunny and mostly dry. Temperatures do not drop too much at night as they do in some countries in Africa, etc. That is because you are surrounded by sea rather than land. If you do encounter a shower, it will be short but heavy!
He's (she's) right you know. Just be aware that the weather will be hot and probably humid all day and all night and if you like that you'll love prime time in the Caribbean. Vision, though, will be cool on the inside as it's an American ship. .... Neil.
It is a very good time to visit the Caribbean. Yes the weather will be hot during the day but it is not humid. The humid season is during our summer months, which is also the season for hurricanes. Some islands are more prone to sudden downpours than others, for example, Dominica, Martinique and we have yet to visit St. Lucia (where we have been 4 times) without at least one shower. However, these showers are over in a few minutes usually so don't worry about that. It is cooler during the evening when the sun has gone down but it is still very warm often with a welcoming breeze.
After being on an excursion it is always lovely to get back onto the airconditioned ship. I hope this helps.