This dataset contains a timeseries of pressure (dbar), sea pressure (dbar), and depth (m), within the inner regions of four UK estuaries: Conwy, Dyfi, Milford Haven and Kent. Data was collected between 2020 and 2023. The temporal resolution is either 1s or 10 s. Specific information on the data locations, deployment methods, units and reference levels, data structure, and quality control can be found in the accompanying supporting documentation (read_me.docx).