Heat and fluid flow around a rotating cylinder in the free-stream flow at the Reynolds number of 200 is numerically investigated by means of the finite volume approach. Computations are performed using different counter-clockwise non-dimensional rotating speeds (RS) between the 0 and 4. The obtained results are validated against the available data. It is found that proportional to the RS, an asymmetric flow topology is developed around the cylinder which causes to an increase on the lift coefficient and a decrease on the drag coefficient. In addition, instabilities of the shear layer are reduced proportion to RS due to suppression the wake and dominating the rotating flow around the cylinder. On the other hand, it is revealed that rotating the cylinder decreases the rate of heat transfer between the hot cylinder and surrounding fluid flow, generally. Finally, it is demonstrated that both vortex shedding process and rotation of the cylinder have influences on the heat transfer process.