###### Abstract
Thus, while the direct analysis of microplastic pollution is outside the scope of this study, understanding its broader implications remains vital in the context of overall water quality management. The impact of climate change on the performance of WWTPs is not limited to changes in extreme weather conditions. Seasonal variations in rainfall and temperature have significant implications for wastewater treatment efficiency. Shifts in precipitation and temperature patterns can affect the volume and composition of wastewater inflows, which in turn influences the treatment effectiveness. For instance, during extreme rainfall events, WWTPs may struggle to handle increased inflows, leading to overflows and inadequate treatment. Similarly, in drier periods, reduced water usage may compromise the efficiency of biological and chemical treatment processes [18; 19]. The deleterious effects of climate change on wastewater treatment plant (WWTP) performance make it one of the main challenges that must be addressed promptly [18; 20; 21]. Rainfall and temperature fluctuations significantly affect WWTP performance, as seen in studies showing impacts on sedimentation, aeration, and treatment efficiency [18; 19; 22; 23; 24; 25; 26; 27; 28; 29; 30]. Seasonal tourism spikes, such as at Lake Markakol, Kazakhstan, and Lake Como, exacerbate these challenges, increasing wastewater loads and straining infrastructure [31; 32; 33; 34; 35]. Case studies, like the Central Irbid WWTP in Jordan, reveal seasonal variations in BOD, COD, and TSS removal, with summer showing improved performance and winter declines [36; 37]. Globally, inadequate responses to climate impacts on WWTPs pose risks to public health and ecosystem sustainability [38; 39; 40; 41; 42]. Lake Como, a multifunctional ecosystem supporting tourism, irrigation, hydropower, and flood prevention, underscores the urgent need for adaptive wastewater management in regions facing both climatic and human pressures [43; 44; 45]. Given these diverse uses and its popularity as a tourist destination, the lake is highly sensitive to both seasonal and climate-induced variations. Effective wastewater treatment is therefore crucial to maintaining the ecological health of the lake and ensuring both its suitability for both human use and its environmental sustainability. This study aims to explore how seasonal changes in temperature and precipitation impact WWTP performance, with the goal of providing insights that can inform future management practices. The lake's multifunctional use makes it highly sensitive to both seasonal climate variations and fluctuations in human activity, which significantly impact the performance of local WWTPs. This study's novelty lies in examining how these seasonal patterns, driven by climate changes, specifically affect WWTP operations in this dynamic, multifunctional region--a focus underexplored in the existing literature. Briefly, it explores three key aspects. First, it investigates seasonal variation, delving into the complex interaction between seasonal environmental factors, such as temperature and rainfall, and the performance of wastewater treatment plants (WWTPs). By focusing on these dynamics, this study provides a fresh perspective on how seasonal changes influence wastewater treatment processes, shedding light on the adaptability and efficiency of treatment plants under varying environmental conditions. Second, this research is distinguished by its extensive parameter analysis, encompassing a broad spectrum of WWTP performance indicators. These include the pH levels, phosphorus removal efficiency, organic pollutant levels (COD and BOD), levels of suspended solids, levels of nitrogen compounds, and ammonia removal. This comprehensive approach offers a deeper understanding of the overall treatment process amid changing climatic conditions, yielding essential insights into effective treatment management strategies. Lastly, the broader implications of this study extend beyond a single WWTP.