Electronic structure and topology across Tc in the magnetic Weyl semimetal Co3Sn2S2

${\mathrm{Co}}₃{\mathrm{Sn}}₂{\mathrm{S}}₂$ is a magnetic Weyl semimetal, in which ferromagnetic ordering at 177 K is predicted to stabilize Weyl points. We perform temperature and spatial dependent angle-resolved photoemission spectroscopy measurements through the Curie temperature (${T}_c$), which show large band shifts and renormalization concomitant with the onset of magnetism. We argue that ${\mathrm{Co}}₃{\mathrm{Sn}}₂{\mathrm{S}}₂$ evolves from a Mott ferromagnet below ${T}_c$ to a correlated metallic state above ${T}_c$. To understand the magnetism, we derive a tight-binding model of Co-$3{d}_{{x}²\ensuremath{-}{y}²}$ orbitals on the kagome lattice. At the filling obtained by first-principles calculations, this model reproduces the ferromagnetic ground state, and results in the reduction of Coulomb interactions due to cluster effects. Using a disordered local moment simulation, we show how this reduced Hubbard $U$ leads to a collapse of the bands across the magnetic transition, resulting in a correlated state, which carries associated characteristic photoemission signatures that are distinct from those of a simple lifting of exchange splitting. The behavior of topology across ${T}_c$ is discussed in the context of this description of the magnetism.