A permanently moored thermistor chain at the deepest point in Lough Bunaveela measured water temperature at 8 different depths (1m, 3m, 5m, 7m, 9m, 11m, 15m, 17m). This dataset comprises data collected between February 2009 and August 2019 which has gone through detailed QA/QC (averaged over 1-hour intervals and 1-hour missing gaps linearly interpolated). Temperature was recorded using StowAway TidbiT temperature data loggers from Onset (TBI32-05+37) (https://www.onsetcomp.com/products/data-loggers/tbi32-0537). More recent data can be requested or downloaded from the Marine Institute through www.marine.ie. More information can be obtained from burrishooleLTER@marine.ie A temperature profile of the water column of Lough Bunaveela Co.Mayo Ireland from 2009 - 2019.