These are the streamwise velocity time series measured in the wakes of two sets of porous discs in side-by-side setting as used in the manuscript ``Wake merging and turbulence transition downstream of side-by-side porous discs´´ which is accepted by Journal of Fluid Mechanics. Data was obtained by means of hot-wire anemometry in the Large Scale Wind Tunnel at the Norwegian University of Science and Technology in near-laminar inflow (background turbulence intensity of approximately 0.3%) at an inflow velocity of 10m/s (diameter-based Reynolds number 125000). Two types of porous discs with diameters D = 0.2m, one with uniform blockage and one with radially changing blockage, were used. Three spacings, namely 1.5D, 2D and 3D, were investigated. Span-wise profiles were measured at 8D and 30D downstream for each case, and a streamwise profile along the centerline between the discs was additionally obtained. In addition, measurements downstream of both disc types (singe disc setting) are provided as comparison. The scope of these experiments was to study the merging mechanisms of the turbulence when the two wakes are meeting.