This study examines the performance of photovoltaic (PV) installations in different areas near Sydney (NSW) by analyzing meteorological data from ten weather stations. The Sandia PV array performance model is utilized to analyze the thermal and electrical performance of four distinct PV module installation conditions. Results indicate that extremely hot weather conditions significantly reduce module efficiency, with close roof mount and insulated back configurations exhibiting lower performance than the open-rack configuration. PV cell operating temperatures can reach hourly peaks ranging from 60°C, for the open rack mount, to more than 90°C for the insulated back. Temperature derating, defined as the deviation of PV power output from the standard test cell temperature conditions (Tc=25°C), can reach hourly peaks of about -40% for the insulated back configuration. A strong negative linear correlation (R-Pearson=-0.79) is observed between PV performance ratio and cooling degree hours, with extreme hot weather conditions having a significant impact on both PV performance and demand for cooling. The open rack configuration demonstrates the highest power production, while the insulated back configuration leads to decreased power production up to 9.5% in summer and 8.3% annually in relation to Sydney, NSW.