  The influence of finite temperatures and pairing correlations on the ground
state properties of multi $\Lambda$- Ca, Sn and Pb hypernuclei is explored
using finite temperature Hartree Fock Bogoliubov approach and contact pairing
interaction. A critical temperature is predicted and is in agreement with the
Bardeen Cooper Schrieffer relationship $k_B T_C^\Lambda \approx 0.5
\Delta^{T=0}_\Lambda$, beyond which pairing correlations drop to zero. Particle
densities, $\Lambda$ single particle energies, and nuclear radii are weakly
impacted by pairing as well as by finite temperatures. However, other nuclear
properties which are more sensitive to pairing correlations, such as $\Lambda$
pairing gaps, condensation energies, and abnormal densities are also more
impacted by finite temperature, especially around the critical temperature.
Furthermore, calculations show the occurrence of the pairing re-entrance effect
in the $^{280}_{70\Lambda}$Pb hyperon drip line hypernucleus. Our study
provides insight into the thermal evolution of $\Lambda$ pairing, i.e. the
emergence and vanishing of pairing correlations in multi $\Lambda$ hypernuclei
as a function of temperature.
