you'll see by the chart below, the weather in the Maldives tends to be nearly identical regardless of the month. The days are always quite warm and at least somewhat humid, and the nights are always reasonably warm and a bit balmy.
Unlike many other tropical destinations, the Maldives has two different “monsoon” periods each year, but neither are known for dramatic weather or flooding, so the differences are rather subtle. Even during the non-monsoon periods there will be some infrequent rainfall, so the overall consistency is what is most striking for the potential visitor. The best times to visit the Maldives really depend on your goals and almost the entire year is a good time if you can make it.