I do not possess information regarding the exact conditions of a particular location, and therefore, I cannot give a definite answer to this question. However, I can provide some general information that may be helpful.

Gauingen Travertine is a natural stone that is known for its durability and weather resistance. It is often used in exterior applications such as facades, paving, and landscaping. However, like most natural stones, it may have different levels of porosity, which could affect its ability to hold up in very sunny climates.

To determine if Gauingen Travertine is suitable for a specific project in a very sunny climate, it is best to consult with a stone expert who can provide advice on the stones properties and how it will react in different environmental conditions. Additionally, proper installation and maintenance of the stone can also play a significant role in its longevity and performance over time.