Santa Cecilia, Sao Tome and Principe offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Santa Cecilia, Cantagalo, Sao Tome and Principe, is known for its pristine beaches and vibrant marine life. The best time to travel to Santa Cecilia, São Tomé and Príncipe, is from June to September, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 26°C (79°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!