Previous investigations of FePd circular island arrays have shown the hysteresis-free switching from vortex to collinear magnetic state at high temperatures [1]. This raises interest in the exploration of the temperature and inter-island interaction effect on the magnetization dynamics in this kind of structures. Ferromagnetic resonance (FMR) measurements allow for the investigation of the magnetization response to time-dependent magnetic field excitations. In this work, the dynamics of a square lattice of circular Fe20Pd80 alloy islands were investigated. The micromagnetic simulations of FMR response were carried out with the parameters similar to those used in the experiments. The experimentally measured FMR absorption spectra were qualitatively reproduced employing micromagnetic simulations. Furthermore, the spatial maps of th estanding spin wave modes were calculated. It was confirmed that the features arising in the FMR absorption spectra are governed by both the temperature and the inter-island interactions.