Beppu's winters are mild, with temperatures ranging from -4°C to 18°C in January and February, averaging around 7-9°C. Spring brings a gradual warming trend, with temperatures increasing to an average of 16°C by April and peaking at 27°C in May. Summer is hot and humid, with July and August seeing highs often reach 34-35°C, while autumn is warm but pleasant, with temperatures dropping back down to around 10-20°C by October and November.