<p>Despite recent advances in impinging sweeping jets, it remains unclear whether a linear correlation between momentum and heat transfer holds locally across the impingement region, and whether this coupling permits the temporal reconstruction of the dominant velocity dynamics solely from wall measurements. This study investigates whether the unsteady velocity dynamics of an impinging sweeping jet can be inferred from non-intrusive wall heat transfer measurements. The flow is characterised by strong spatial inhomogeneity and large-scale, aperiodic motion associated with the sweeping dynamics. Particle Image Velocimetry snapshots are combined with time-resolved convective heat transfer fields acquired on the impingement surface, modelled with a heat flux sensor, and measured using high-speed infrared thermography. We use Extended Proper Orthogonal Decomposition as a reduced-order linear correlation framework to assess and exploit the temporal coupling between wall thermal signatures and the impinging velocity field measured on orthogonal planes. The method successfully enriches the temporal description of the large-scale velocity dynamics. These findings indicate that the primary energy-carrying structures of the flow are encoded in the wall heat transfer dynamics. The modal analysis provides evidence of a low-rank linear coupling between wall heat transfer and the dominant velocity dynamics in this configuration.</p>