Gassin, France offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Gassin is known for its picturesque medieval village and stunning views of the Gulf of Saint-Tropez. The best time to visit Gassin, France, is from May to September, with average air temperatures ranging from 20°C to 28°C (68°F to 82°F) and water temperatures around 20°C to 24°C (68°F to 75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!