Abstract: Performance of 3rd generation solar cells like perovskite based devices under different climatic conditions/ambient temperature is one of the recent areas of research. To do this away by experiments is highly challenging and energy consuming task. In this paper extremely thin perovskite based functional solar cell device has been simulated at different operating temperatures for getting insights into the performance. As it is known that temperature is the key factor which can affect the performance of any well design laboratory level solar cells. Hence, it is of utmost importance to see through any possible changes those may occur with real climatic temperatures. In this device simulation, temperature of the ultrathin solar cell configured as ITO/PEDOT:PSS/P3HT:PCBM/Al has been tuned between 270 and 370 K to trace the optimal performance as energy conversion device. In addition to the active layers, suitable front and back metal contacts are taken into the consideration in the form of ITO and Al, respectively. Such type of device level simulation analysis will help experimentalists to get benefitted in designing/implementing their resources towards development of more robust and capable PSCs which can be operated at wide temperature range.