Yes, Tuscan Terracotta can be used for exterior applications in very sunny climates. Terracotta is a durable material that is traditionally used in Mediterranean regions, including Tuscan architecture. It is resistant to sun exposure and can withstand high temperatures. However, it is important to ensure proper installation and sealing to protect against excessive moisture and UV damage. Additionally, regular maintenance and cleaning may be required to preserve the appearance of the terracotta in sunny and outdoor environments.