Castara, Trinidad and Tobago offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Castara is known for Castara Bay, Castara Waterfall, and the Castara Retreats in regard to tourism. The best time to travel to Castara, Trinidad and Tobago, is from January to May, when the average air temperature is around 27°C (81°F) and the water temperature is approximately 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!