This study provides insight into how the energetic performance of a typical photovoltaic solar system (PV) will change in a warmer world with increased levels of greenhouse gases. It was considered a photovoltaic system disconnected from the distribution grid, similar to those available in the market. The methodology covers systems without batteries and with the use of batteries with finite electric charge storage. The climatic change is accessed from a scenario predicted from the HadCM3(Hadley Centre Coupled Model, version 3) major global circulation model reported in the International Panel for Climatic Change (IPCC). The outputs from a future weather scenario were used as inputs for the long-term performance simulations for the typical PV solar system. The results encompass predictions for the decades of 2020, 2050 and 2080, and are presented in terms of monthly average daily energy output, fraction of the load supplied for a system with and without battery, and energetic efficiency. Seven cities in different climatic zones were evaluated. The cities and regions presented distinct behaviors, such that in some cases the PV system generated less energy, while in others an increase in photovoltaic generation was observed. However, regarding the energetic efficiency of the system, all scenarios presented increasing losses throughout the decades.