Extreme weather events (EWEs) are intensifying in frequency and severity, posing complex pulse and press disturbances to coastal ecosystems. While each disturbance type has been studied in isolation, empirical data on their combined effects under realistic field conditions are virtually absent. Here, we examine how compound pulse–press disturbances shape the successional dynamics of taxonomic and functional beta diversity in free-living marine nematodes, a group well suited for detecting community reassembly due to their short generation times, ecological sensitivity, and trait diversity. Following two EWEs in central Greece, we monitored eight sites at 0-, 6-, and 12-months post-disturbance. Beta diversity was partitioned into turnover and nestedness components using presence–absence and abundance data. Taxonomic beta diversity was shaped predominantly by turnover and responded strongly to disturbance intensity and time, whereas functional beta diversity showed subtle responses, likely reflecting high trait redundancy. Early stages reflected spatially structured legacies, mid-stages showed deterministic environmental filtering, and late stages revealed decoupling between taxonomic and functional trajectories. This study provides the first comprehensive empirical evidence of how compound pulse–press disturbances drive divergent successional dynamics in marine sediments, and highlights nematodes as powerful yet underutilized model organisms of post-disturbance reassembly.