While the chronological dimension of L2 motivation has been widely emphasised, there is little empirical research examining the context-based and dynamic languages other than English (LOTEs) motivational profiles. To fill this lacuna, the current study investigated the motivational trajectories of eight local adult learners of Portuguese in Macao with reference to the L2 Motivational Self System (L2MSS). Data were collected through semi-structured interviews, informal interviews and written journals. The findings indicate that Portuguese learning experience is of great importance in LOTE motivation. The convergence of the instrumentality of Portuguese for future career and the interest in Portuguese culture played a significant role in sustaining LOTE motivation. The findings further reveal that active personal engagement and metacognitive strategies use are two main motivating components in LOTE learning experience. The study sheds new light on the complexity of LOTE motivation.