Frequency of 200 mm or more rainfall per day Japan 2014-2023
In 2023, precipitation of 200 millimeters or more per day occurred 304 times in Japan. Within the past decade, at 389 times 2019 was the year with the most recorded occurrences of rainfall of this magnitude.
Most of the rainfall in Japan occurs during the rainy season, which lasts from early June to mid-July. Heavy rain is often caused by typhoons, which develop over the Pacific Ocean and regularly approach the archipelago between July and October.