Kumagaya experiences a temperate climate with significant seasonal variations. Winters are cool and occasionally cold, with temperatures often below freezing in January and December, but warming up to around 18°C by February. As spring approaches, temperatures gradually rise, with April and May averaging around 14°C and 19°C respectively. Summer is warm to hot, with July and August reaching highs of 36°C and 39°C, while autumn sees a return to milder conditions, with October averaging around 17°C.