[en] We report bulk and local magnetic studies in single-phase cubic (AuCu₃-type) Ce_1-xU_xPd₃ intermetallic alloys for 0 ≤ x ≤ 0.3. Bulk magnetization data for all compositions exhibit paramagnetic behaviour that shows enhanced effective magnetic moment μ_eff and progressive reduction of θ_P with U content. The data - combined with the local susceptibility (χ_loc) of ¹⁴⁰Ce, measured by time-differential perturbed angular correlation spectroscopy - reveal a smooth cross-over from intermediate valence to nearly trivalent local moment behaviour with a sharp diminution of Kondo temperature T_K with x. We believe that 5f-band electrons of U strongly influence the magnetism and Kondo behaviour of Ce ions in these alloys