The monitoring of sea water quality for swimming in the Republic of Croatia is carried out with the aim of preserving the health of swimmers and is regulated by the Regulation on the Quality of Sea Water for Swimming (NN 73/08). The microbiological indicators that are determined include intestinal enterococci and Escherichia coli, as indicators of fecal contamination. Other characteristics of sea water quality that are monitored include sea and air temperature, wind, rain, salinity, and visible pollution. The aim of this study was to investigate the occurrence of Salmonella spp. in swimming sea water in the narrower area of the city of Rijeka, under different environmental conditions. Additionally, the study examined the correlation between the occurrence of Salmonella spp. and indicators of fecal contamination, as well as additional fecal (Clostridium perfringens) and non-fecal (Staphylococcus aureus, Pseudomonas aeruginosa, UBB/37/22) indicators of microbiological load. The presence of Salmonella spp. is associated with watercourses where wastewater is discharged without prior treatment. For this study, four beaches in the western part of the city of Rijeka were selected, having 6 sampling locations in total. To achieve a denser network of sampling locations, the study was conducted at an additional 6 (profile) locations, making a total of 12 locations. As part of the EUROBATH project, sampling at these locations was conducted during three swimming seasons, once a week. Salmonella was detected in 41 samples (3.7%), of which 28 were marked as suitable for swimming. The results show that salinity and solar radiation significantly affect the concentration of Salmonella in the sea water. The inflow of fresh water into the sea is a source of microbiological contamination, and the occurrence of Salmonella in the sea greatly depends on the amount of rainfall. It has been proven that monitoring only routine indicators, E. coli and enterococci, does not exclude the possibility of swimmers coming into contact with Salmonella bacteria.