Setagaya's weather is characterized by cool winters with temperatures ranging from freezing lows to mild highs, averaging around 4-7°C in January and February. As spring approaches, temperatures rise steadily, reaching averages of 12-14°C in March and April, with occasional warm days surpassing 20°C. Summer months bring sweltering heat, with July and August often seeing temperatures above 30°C, while autumn brings a return to milder conditions, with September's average temperature mirroring that of March. In the winter, Setagaya experiences chilly temperatures once again, with December averages similar to those in February. The spring and autumn seasons are marked by gradual warming and cooling, respectively, with temperature fluctuations of around 10-15°C within each season.