In the field of Humanities, Social Sciences, Cultural Studies and Sociology, top-down technocratic climate mitigation policies frequently overlook indigenous seasonal environmental knowledge systems. This empirical investigation systematically examines Indigenous Ecological Knowledge and Community Climate Adaptation Narratives in Pacific Small Island States through a multi-stage experimental methodology and rigorous quantitative analytical framework. Utilizing participatory rural appraisal, traditional seasonal calendar mapping, and qualitative narrative analysis across six coastal island villages, data were gathered across multiple operational cycles and validated against established international benchmarks. The statistical and computational results reveal that indigenous seasonal forecasting and traditional mangrove bio-shield stewardship provided superior coastal surge protection compared to concrete seawalls. Comparative sensitivity analyses confirmed a statistically significant improvement (p < 0.01) over conventional baseline approaches, with heightened reproducibility and robust fault tolerance. These comprehensive findings provide actionable theoretical insights and practical implementation guidelines for climate adaptation policy agencies, Pacific development organizations, and environmental anthropologists. Furthermore, the standardized protocols established in this study offer a valuable foundation for future cross-disciplinary investigations, policy formulation, and scalable technological deployment across global academic and industrial environments.