As far as we know there is no such limit of max. temperature. Temperature is known to be related to energy (thermal) and Einstein’s theory of relativity means that although a particle has a universal speed limit, it doesn’t have an energy limit.
Although contemporary models of physical cosmology postulates that Plancks temperature is the maximum temperature , there is no any scientific theory for the behavior of matter at this energy.
also there is no evidence of the hottst that we could get.
approve if useful ; )