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Over the past couple of years, Nigeria has been experiencing freak weather patterns ranging from longer-than-usual rainy seasons to severe dryness in the country's northern parts and seemingly drought phenomena across the country. This study examined a sustainable city planning mechanism for mitigating climate change in the Lagos Metropolis. Empirical studies on the analogies of climate change in urban areas in Nigeria were discussed to explain the vagaries of the study. Several flood parameters in selected locations of the Lagos metropolis were leveraged to demonstrate the incidence and consequences of flooding in the area. Width in meters, height ever recorded in meters, frequency per annum and most extended duration experienced in days were used to analyze the consequences of flooding in Lagos metropolis. The means for the flood parameters for the entire metropolis are 137.35 meters, 2.43 meters, 6.12 times per annum and 22.87 days. An array of possible causes of floods identified mainly torrential rains (94.10%), filled/silted/dirty drainage channels (87.15%), blocked canals (97.55%), inadequate drainage channels (94.30%), and encroachment (90.90%) in Lagos metropolis. Therefore, This study recommends a sustainable city planning mechanism for mitigating climate change. Keywords: Climate Change, Sustainability, Planning, Mechanism and Weather Regions.