Pressure, temperature, conductivity, and derived salinity data with their associated quality flags from the Vigo section of the monitoring program "Oceanography Time Series in Northern Spain" (RADIALES; https://www.seriestemporales-ieo.net/), carried out by the Instituto Español de Oceanografía. Data were collected biweekly to monthly from August 1987 to September 2020 in the interior of the Ría de Vigo and its adjacent shelf, at four stations with depths ranging from 29 m to 148 m. Data were acquired using MARK III, Sea-Bird Scientific 19 SeaCAT, SBE 9 Plus and SBE 25 Sealogger CTD (conductivity, temperature, depth) profilers. They were processed using Sea-Bird Scientific's Seasoft software package, and subsequently, quality controlled with both ctdcheck (https://github.com/PabloOtero/CTDChecker) and Ocean Data View software.