The Rough River (also called the Srahrevagh River) is a tributary of the Srahmore River in the Burrishoole Catchment. Water temperature in the river is measured at high frequency (sub-hourly) as part of the long term monitoring of the Burrishoole catchment, an index site for salmonid populations in the NorthAtlantic region. This dataset comprises daily values of water temperature between 7/9/2001 and 31/12/2017. Water temperature (in deg C) was measured using a StowAway TidbiT temperature data logger from Onset (TB132-05+37) at location 53.982207, -9.566988. The water depth at the site is circa 0.5m. Water temperature is a key regulator of the the growth and survival of salmonids, and it is measured to enable the analysis of ecological processes in the catchment.