On sea days, it ain't no big deal. I've always found loads and loads of activities, and entertainment aboard, and inside the ship. If it's a port day,,,,welll,,,,like kyrisong said,,,take the ponchos, and chances are excellent that it's just a short shower, and blue skys are gonna' show up.
In any case, don't let it spoil your vacation, and especially don't let the possibility of a shower spoil your vacation.

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