Nihonmatsu experiences a moderate climate with distinct seasonal changes. Winters are cold and snowy, with temperatures often below freezing, particularly in January and February. As spring arrives in March, temperatures gradually warm up, reaching averages of around 7°C, followed by a continued rise into April and May, which bring mild conditions with average highs around 17-20°C. Summer months, June to August, are hot and humid, with temperatures frequently soaring above 30°C, while autumn sees a gentle cooling trend, with September being the warmest month of the season. The city's temperature drops again in November, signaling the approach of winter.