Most of the Japanese archipelago belongs to the temperate zone, but the distinction between the four seasons is clear. However, due to the long north-south terrain, Hokkaido belongs to the subarctic zone and Okinawa belongs to the subtropical zone. From June to July, except for Hokkaido, the amount of precipitation increases and long rains continue in "the rainy season". In addition, from July to October, tropical cyclones that occur over the southern seas move northward as typhoons. Strong winds and heavy rains, especially in Okinawa and Kyushu, may cause natural disasters.
Spring (March-May) There are many relatively warm days. It can get hot during the day, so only a light jacket is necessary.
Summer (June-August) There are many days when both the humidity and temperature are high.
Autumn (September-November) Humidity is low and there are many days of comfortable weather.
Winter (December-February) Due to the influence of monsoons from the continent, there is a lot of snow on the Sea of Japan side, and cold winds often blow on the Pacific side. The temperature will drop considerably, so you will need a coat or down jacket.