Due to on-going global warming, extreme storm-surges are expected to threaten a greater number of coastal communities worldwide. However, global and regional climate simulations of extreme events are still not accurate enough to respond to the growing needs of the local decision makers to prepare for these rising hazards. Here, we present a new methodology using (sub-)kilometre-scale coupled atmosphere-ocean-wave models and demonstrate the feasibility to provide meter-scale assessments of the impact of climate change on storm-surge hazards. As a proof of concept, we show that sea-level variations and distributions can be derived from the AdriSC WRF-ROMS 1-km model and the AdriSC WRF-ADCIRC-SWAN at the climate scale in the Adriatic Sea small lagoons and bays. This project contains all the data associated with the article "Next-generation (sub-)kilometre-scale climate modelling for extreme storm-surge hazard projections". It is divided in two main parts dealing with: (1) the evaluation, statistical analysis and sea-level hazards derived from the AdriSC WRF-ROMS 1-km results and (2) the sub-kilometre-scale hazard assessments quantified with the AdriSC WRF-ADCIRC-SWAN results.