The data consists of Scorff river water temperature collected for the Environmental Research Observatory (ERO) on Diadromous Fish in Coastal rivers (DiaPFC). ORE DiaPFC is a research infrastructure focused on studying the evolution of diadromous fish populations under the influence of human-induced and environmental changes (mainly agriculture and climate). Sampling is conducted at 5 sites spread along the mainstem, one since 1995 and others since 2005 and later. Scorff River: Latitude ranges from 47.7718 to 48.1682; longitude ranges from -3.2497 to -3.3404 and elevation range from 0 and 144 metres. The Scorff River is a small coastal river in southern Brittany (France). The main river is 78.6km long, including a 15km estuary. The mean gradient is 3.6%, annual mean discharge is 5m3/s and the drainage basin area has an area of 480km2. Agriculture is the main human activity and land use, with several areas of moors and forests.