Roquebrune Cap Martin, France offers 11 beaches perfect for sunbathing, surfing, swimming, and more. Roquebrune Cap Martin is known for the historic Chateau de Roquebrune-Cap-Martin and its picturesque Mediterranean coastline. The best time to travel to Roquebrune-Cap-Martin, 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 from 18°C to 24°C (64°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!