As part of an ecological monitoring initiative, the Institute of Oceanology Polish Academy of Sciences IOPAN (Marine Ecology Department) deployed a series of bespoke metal constructions to conduct a long-term multipurpose experiment assessing the ecology of hard-bottom assemblages in the shallow subtidal of southern Isfjorden proper between 2006 and 2022 (16yr). Attached to these submerged constructions were data-loggers of temperature and light intensity. Two stations (S1 and S2) and two depth strata (shallow infralittoral, and circalittoral) were considered for the deployments. This dataset contains the sea water temperature (degC) and light intensity (lux) at sea floor data of the loggers installed at 15m depth, station S2 (i.e., S2 deep, or S2d; coordinates: 78.1879, 15.1451).