We prove that the normalized Fourier coefficients of a generic family of Maass-Poincare series of integral weight k and prime level p become quantitatively equidistributed with respect to the Sato-Tate measure as p -> infinity. As a consequence, we deduce similar results for harmonic Maass forms of integral weight k <= 0 and level p, and weakly holomorphic modular forms of integral weight k >= 2 and level p.(C) 2022 Elsevier Inc. All rights reserved.