Flooding with increasing intensity and frequency is presenting significant challenges for risk management and land use planning in urban areas. This is further exacerbated by uncertainties regarding how flood patterns are changing because of climate change. However, how such uncertainties are considered to inform flood risk management and land use planning decisions can vary largely from place to place and remain unclear in the literature. This paper contributes to this by examining how uncertainty is dealt with in flood risk management and land use planning in Aotearoa New Zealand. Drawing on empirical data at the local level, findings indicate that Aotearoa New Zealand’s decision-makers face challenges in considering and communicating uncertainty due to the prevalence of outdated approaches and regulatory constraints, fragmented risk governance, and lack of appropriate understanding of different perceptions and assumptions regarding flood risk between different stakeholders. Based on findings, the paper discusses the critical role of a national-level adaptive flood risk governance in helping to ensure consistency and coherency across different jurisdictions and levels of government, regarding the incorporation of uncertainty into flood risk management and land use planning. This includes the provision of national directives for incorporating uncertainty in decision-making whilst leaving room for innovation and targeted variability at the local level.