In 2024, precipitation of *** millimeters or more per day occurred * times in Japan. Within the past decade, this figure peaked at ** days in 2019. 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.
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JMA. (May 7, 2025). Annual number of days with 400 mm or more rainfall in Japan from 2015 to 2024 [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 24, 2026, from /statistics/1192569/japan-number-days-400-mm-rainfall/
JMA. "Annual number of days with 400 mm or more rainfall in Japan from 2015 to 2024." Chart. May 7, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 24, 2026. /statistics/1192569/japan-number-days-400-mm-rainfall/
JMA. (2025). Annual number of days with 400 mm or more rainfall in Japan from 2015 to 2024. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 24, 2026. /statistics/1192569/japan-number-days-400-mm-rainfall/
JMA. "Annual Number of Days with 400 Mm or More Rainfall in Japan from 2015 to 2024." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 7 May 2025, /statistics/1192569/japan-number-days-400-mm-rainfall/
JMA, Annual number of days with 400 mm or more rainfall in Japan from 2015 to 2024 ÌÇÐÄÆƽâ°æ, /statistics/1192569/japan-number-days-400-mm-rainfall/ (last visited July 24, 2026)
Annual number of days with 400 mm or more rainfall in Japan from 2015 to 2024 [Graph], JMA, May 7, 2025. [Online]. Available: /statistics/1192569/japan-number-days-400-mm-rainfall/
