  In this paper, we discuss relativistic hydrodynamics for a massless Dirac
fermion in $(2+1)$ dimensions, which has the parity anomaly -- a global 't
Hooft anomaly between $\mathrm{U}(1)$ and parity symmetries. We investigate how
hydrodynamics implements the party anomaly, particularly focusing on the
transport phenomena at the boundary. Based on the parity anomaly matching and
the second law of local thermodynamics, we find $\mathrm{U}(1)$ and entropy
currents localized at the boundary as well as the bulk anomalous current with
vanishing divergence. These edge currents are similar to the
$(1+1)$-dimensional chiral transports, but the coefficients are given by half
of theirs. We also generalize our discussion to more general anomalies among
multiple $\mathrm{U}(1)$ symmetries and single $\mathbb{Z}_2$ symmetry.
