Heavy rain is expected in Okinawa and northern Japan along the Japan Sea side on Sunday, May 24, 2026 [1].
These weather patterns indicate a volatile transition in regional atmospheric conditions. The combination of heavy rainfall and high humidity across multiple prefectures may disrupt travel and outdoor activities across the archipelago.
Forecasters said the conditions are driven by an approaching low-pressure system. This system is bringing front-related rain and humid air into the region, while cold air aloft is strengthening precipitation specifically over the Japan Sea side [1], [2].
Temperature variations will be significant across the country. In the north, Sapporo is expected to reach a high of 16 °C [1], while Kushiro will see 13 °C [1]. Other northern cities include Aomori at 18 °C, Morioka at 15 °C, and Sendai at 17 °C [1].
Central and western regions will experience warmer, more humid weather. Niigata is forecasted at 23 °C, while Nagano and Kanazawa are both expected to reach 25 °C [1]. Tokyo is predicted to hit 23 °C [1].
Further south, temperatures continue to climb. Nagoya, Hiroshima, and Fukuoka are all forecasted at 28 °C [1]. Osaka, Kagoshima, and Naha are expected to reach the day's highest marks at 29 °C [1]. Other western cities include Okayama at 27 °C, Matsue at 26 °C, and Kochi at 27 °C [1].
While the north and Okinawa face heavy rain, east and west Japan will see humid conditions with occasional showers [1].
“Heavy rain is expected in Okinawa and northern Japan along the Japan Sea side”
The convergence of a low-pressure system and cold air aloft creates a high-contrast weather day for Japan. The disparity between the cool, rainy north and the humid, warm south highlights the complex meteorological interactions occurring as the region moves deeper into the spring season.
