The thermal behaviour of several commercial hydrogen tanks has been studied during high pressure (70-84 MPa) hydrogen cycling. The temperature of the gas at different points inside the tank, the temperature at the bosses and the tank outer wall temperature have been measured under different filling and emptying conditions. From the experimental results, the effect of the filling rate (1.4-9.2 g/s) and the influence of the liner material on the thermal behaviour of the hydrogen tanks have been evaluated. The thermal response of the metallic bosses under different cycling conditions has also been investigated.