Saudi Arabia is increasing renewable energy generation, electrifying its systems and implementing digital technologies in the grid, all against a backdrop of a climate in which summer temperatures, dust, humidity and other co-occurring environmental stresses simultaneously raise demand and degrade the electricity infrastructure. This study synthesizes the evidence published between 2020 and 2025 to examine how climate-resilient smart-grid planning can help reduce these interconnected risks. A structured integrative review was carried out by selecting a purposeful collection of peer-reviewed studies and official energy and climate reports, with a focus on Saudi Arabia, the Gulf Cooperation Council, arid power systems, and methods of resistance that can be transferred to other contexts. The evidence was analysed along four dimensions: hazard, exposure, vulnerability, and adaptive capacity, and then linked to the areas of generation, transmission, distribution, demand, storage, digital control, and governance. The synthesis reveals that extreme heat is not simply a single issue relating to equipment; it causes cooling peaks at the same time, reduces both generation and network capacity, accelerates thermal ageing, and can occur alongside photovoltaic soiling, constraints on water use, and communication or cyber-physical failures. The most effective approach to planning therefore involves a multi-layered system that incorporates climate-based load forecasting, dynamic asset ratings, heat-resistant equipment, a varied geographical mix of renewable energy sources, storage, demand response, microgrids for critical loads, advanced metering, artificial intelligence, and regional interconnection. The review suggests a planning framework specific to Saudi Arabia that takes into account resilience together with cost and decarbonisation, using measures such as critical-load continuity, energy not served, restoration time, thermal headroom, and forecast error in severe situations. It finds that climate resilience should be integrated into long-term capacity expansion, grid codes, asset standards and operational digital twins, rather than an add-on for emergency management.