Japan’s Meteorological Agency (JMA) announced on Sunday that the Kanto-Koshin region (including Tokyo) and the Tokai region have officially entered the rainy season.
Thank you for reading this post, don't forget to subscribe!This year’s arrival aligns perfectly with historical averages for Tokyo and the surrounding Kanto area, while the central Tokai region is starting just one day later than usual.
The Seasonal Timeline
The seasonal rain front (baiu zensen) is currently moving across the country. Here is where the rainy season stands nationwide:
- Okinawa & Amami: Began in early May. The heavy rains typically wrap up between June 21 and June 29.
- Kyushu, Chugoku & Kinki: Started earlier this month.
- Kanto & Tokai: Just commenced on Sunday.
- The Outlook: For most of the Japanese mainland, the prolonged rainy stretch is expected to last until mid- to late July.
Severe Weather and Safety Warnings
As the rain front moves east-northeast through southern Kyushu, it is pulling in warm, highly humid air, creating unstable atmospheric conditions. The JMA has issued several active warnings:
Critical Alerts: Residents in the Shikoku region should brace for up to 200 mm of rainfall within a 24-hour period (through noon Monday), with high risks of landslides, rising river levels, and flooding in low-lying areas. Western Japan is also on alert for lightning and strong winds.
If you are currently traveling or living in these areas, keep an eye on local weather updates, secure loose outdoor items, and stay clear of rivers and hillsides.
