The Slocum G2 Glider MIA was deployed in the Gulf of Finland, Baltic Sea, in May-June 2018. The glider sampled an 18 km long section (S–N direction). This data set is the processed delayed time CTD data from that mission. Processing included applying standard quality control and considering response times and thermal lag. The data were binned, and half YOS were arranged as profiles, meaning the variables in the data set are presented as 2D fields.