You might already be aware of this but Japan has four seasons that are spring, summer, autumn, winter. It’s not two seasons, which are dry season and rainy season, like Philippines.
Generally speaking, spring is called from March to May, summer from June to August, autumn from September to November, and winter from December to February.
In addition, June is a rainy season, and it is called TSUYU separately from the four seasons.
Don’t forget your umbrella since it will be rainy days. Don’t you know portable umbrella that you can carry easily, and which is useful? You can buy it even in convenience stores, and it is affordable.