  We have investigated the magnetic correlations in the candidate Weyl
semimetals EuCd$_2Pn_2$, ($Pn$=As, Sb) by resonant elastic X-ray scattering
(REXS) at the Eu$^{2+}$ $M_5$ edge. The temperature and field dependence of the
diffuse scattering of EuCd$_2$As$_2$ provide direct evidence that the Eu
moments exhibit slow ferromagnetic correlations well above the N\'{e}el
temperature. By contrast, the diffuse scattering in the paramagnetic phase of
isostructural EuCd$_2$Sb$_2$ is at least an order of magnitude weaker. The FM
correlations present in the paramagnetic phase of EuCd$_2$As$_2$ could create
short-lived Weyl nodes.
