The city has a humid subtropical climate. It rains throughout the year, but especially in the summer, which is hot and humid with torrential thunderstorms. August and September are cyclone weather. You’ll probably feel icky and sweaty well into October. Winters are cold, but they’re never quite freezing. Temperatures are almost always above 0 degrees Celsius. Very rarely, there might be snowfalls. The temperature breakdowns are as follows:
Spring: March starts out cool and sunny, with night-time lows of 9.9degrees Celsius. This increases to 23.5 degrees Celsius during daytime in May, which still has cool nights.
Summer: June isn’t too bad, with only the middle of the day feeling really hot, and nights that are still cool. It is July and August when temperatures are near unbearable in the daytime (31degrees Celsius), and barely improve at night because the humidity traps all the heat (24degrees Celsius).
Autumns: September is still quite hot, with daily averages of 24degrees Celsius. It’s not until October that the temperatures become nice again, before beginning to plunge in November for the winter, with nights dipping to 9.6 degrees Celsius and day highs at 17.6 degrees Celsius.
Winter: Cold, but not unbearably so. In fact, the days are quite nice so long you wear moderately warming clothing. January is the coldest month, with average lows of 3 degrees Celsius.
Like the rest of Japan, the best season to visit is springtime, when the cherry blossoms bloom. That said, the city is quite festive throughout the year. The only real off season time is the muggy and hot period between August and September.