In general, marble is not the most suitable choice for exterior applications in very rainy climates. Marble is a natural stone that is porous and can be easily damaged by water and moisture. Over time, constant exposure to rain and moisture can cause the marble to absorb water, resulting in discoloration, staining, and deterioration of the stone.
However, specific types of marble, such as Portugals Dynossaurus Marble, may have varying levels of durability and resistance to moisture. It would be best to consult with a professional stone supplier or installer who has knowledge and experience with this particular type of marble in order to determine its suitability for exterior use in a very rainy climate.
Additionally, proper maintenance and care, including regular sealing and protective coatings, can help minimize the potential negative effects of rain and moisture on the marble.