This data repository contains two .csv files that form the published data for the OFS25 Manuscript for Distributed Humidity Sensors using Fibre Segment Interferometry. The two data files contain data from different sources. a) RH_Sensor_Data.csv - contains two columns of data collected from an independent humidity sensor: 1 - Timestamp (s) 2 - Relative Humidity (%) b) Interferometric_Data.csv - contains 5 columns of data collected from a proprietary interferometric interrogator. 1 - Timestamp (s) 2 - Interferometer 1 Phase (rad) 3 - Interferometer 2 Phase (rad) 4 - Interferometer 3 Phase (rad) 5 - Interferometer 4 Phase (rad) This data is suitable for reading in most programs, but please note that the size of file b) is longer than the row limit on Microsoft Excel so will not display the whole data if opened this way.