The study was conducted to evaluate the phenology and litterfall dynamics of Kandelia obovata in the Manko Wetland, Okinawa Island, Japan. The phenology of this species was assessed using litterfall data for 5 years. Stipule litterfall was concurrently occurred with the leaf litterfall. New leaf production and leaf fall peaked in summer, immediately after propagules fell. Leaf and stipule litterfalls linked to monthly sunshine hour, and monthly mean air temperature and monthly mean air relative humidity, respectively. Kandelia obovata had a distinct flowering period, with the flowering phenophase starting in spring and continuing into summer. Fruit initiation started at the end of summer and continued into autumn, whereas propagule production occurred during winter and spring. Flowering of K. obovata was influenced by monthly sunshine hour and monthly mean air temperature, whereas the fruit and propagule litterfalls were not linked to any climatic factor. The average development period from flower buds to mature propagules was approximately 11 month. Mean total litterfall amounted to 991.1 ± 35.4 g m^-2 yr^-1. Kendall’s consistency coefficient suggested that the monthly trends in litterfall components, except branch, did not change significantly among years.