Sayama's winters are chilly, with temperatures often below freezing from January to March, but spring brings rapid warming, with April and May enjoying mild highs around 26-31°C. Summer is hot and humid, with July and August frequently reaching scorching highs above 36°C, while autumn sees a welcome cooldown, with October's temperatures returning to more pleasant averages. The temperature range narrows significantly during the winter months, while summer's extremes are more pronounced. In contrast, spring and autumn experience relatively consistent temperatures, with minimal fluctuations.