What is the rainiest month in Japan?

June is the wettest month of the year across Honshu, with tropical showers occurring until early July. In terms of temperature and weather conditions, spring and autumn are typically the most pleasant times of the year to visit Honshu.



In 2026, the rainiest month in Japan varies slightly by region, but for most of the country, including Tokyo, Osaka, and Kyoto, June is the wettest month. This is due to the "Tsuyu" or plum rain season, a stationary front that brings persistent, gray, and drizzly rain for several weeks as the spring air meets warmer tropical air. During June, Tokyo typically sees about 160mm to 200mm of rainfall. However, there is a secondary peak of rainfall in September and October due to the Typhoon Season. While June has more frequent rainy days, September often records higher "total" rainfall amounts because typhoons can dump massive quantities of water in a very short period. For example, a single typhoon in late September can easily exceed the entire monthly average for June. The exception to this rule is Hokkaido, Japan's northernmost island, which does not experience a true "Tsuyu" season and remains much drier in June. For the rest of the archipelago, June is synonymous with humidity, blooming hydrangeas, and the near-constant need for a sturdy "konbini" umbrella.

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