Saint Barthelemy, Saint Barthelemy offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Saint Barthelemy, known for its luxury resorts, pristine beaches, and the annual St. Barts Music Festival. The best time to travel to Saint Barthelemy is from December to April, with average air temperatures around 77-86°F (25-30°C) and water temperatures around 79-82°F (26-28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!