Measurements of water discharge during the 2013 the melt season in the proglacial river draining from the proglacial lake of Kiattuut Sermiat, a land-terminating glacier in the south of the Greenland Ice Sheet (61.2°N, 45.3°W). The measurements were made in a stable bedrock section approximately 1 km downstream from the proglacial lake terminus. Data loggers recorded measurements every 15 minutes from April to September. Water depth (stage) was converted to discharge (Q) using season-specific ratings curves derived from 51 repeat dye-dilution injections undertaken across the stage values. This research is part of the UK Natural Environment Research Council, NERC-funded DELVE project (NERC grant NE/I008845/1). Additional funding was provided by Cabot Institute (University of Bristol).