Tsuyu : The Rainy Season in Japan

In early summer, the wet season called "Tsuyu" comes around to bring lots of rain and damp humid weather to Japan. The beginning and the end of Tsuyu season vary by region.

In Okinawa located in southernmost of Japan, it begins in early May and ends in early June on average. In Tokyo, Tsuyu usually begins around early June and ends in the middle of July. For Northern region, it comes a bit later and begins in the middle of June and ends in the middle of July. Thankfully, no Tsuyu comes to Hokkaido region.


Needless to say, it is advisable to avoid traveling around this season, and it is also advised that care should be taken for food poisoning, especially if you are a worker or a student who brings Bento (homemade lunch box) to office or school.

What to care when making Bento lunch box

Wash your hands well

Use only cooked food

Keep-refrigerated food like ham should also be cooked. No salad should be included in the Bento box in the rainy season.

Avoid wetness inside of Bento box

Don’t close the lid of Bent box while the contained food is still hot, as it leads to wetness causing spoilage. 

Use food divider to separate each food to prevent spoilage

Another thing you can do to cope with food poisoning is to put an antibacterial film in the Bento box, that is called  “弁当箱 抗菌シートBento Bako Koukin Shiito” and young Japanese mothers often use it for their kid’s bento.

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