The dataset provides sea surface temperature and sea temperature information from a network of internal logging temperature sensors at 17 locations around the Irish coast. The TidbiT Temperature loggers have recorded hourly at each site providing a comprehensive time series dataset on sea temperature around Ireland at aquaculture sites. The majority of TidbiT sites are located along the west coast of Ireland. TidbiT data has been collected since 2004. Temperature is measured by ONSET TidbiT data loggers attached mostly to mussel ropes in the water column with sensor precision ±0.2 °C accuracy over a wide temperature range. Sea temperature is invaluable in understanding the marine conditions at aquaculture sites. TidbiT sea temperature collected by the Aquaculture team of the Marine Institute (Ireland) and data managed by the Data Management team. Data completed for sensor operational periods. There are incomplete periods of sea temperature coverage where issues with sensors arise