This study investigated the effect of temperature in the waveguide with composite cladding and revealed that not only the temperature increase in composite cladding with pure dielectric core can make changes in the optical constants of metal nano-particles, but also it can change the penetration depth, propagation length, distribution field and the intensity of propagated light. The results of simulation showed that the propagation length, the intensity of propagation light and penetration depth will decrease by the increase in the temperature. Also, the distribution field showed significant changes. By the modal analysis of the waveguide with composite cladding, it was proved that the fundamental mode experience the highest thermal changes compared to the first and higher order modes in the propagation features. It is noteworthy that simulation has been conducted by MATLAB software.