Rain clouds are moving across Japan from the west, bringing precipitation to four major regions by early afternoon this Wednesday [2].
This weather shift signals the arrival of the "running rainy season," or hashiri-tsuyu, which is expected to persist through the weekend [1]. The transition marks a period of unstable weather as the rainy season front moves westward across the archipelago [2].
Rain is forecast for Kyushu, Shikoku, Chugoku, and Kinki by early afternoon [2]. The weather system is expected to move further east, bringing rain to the Tokai and Kanto regions later in the day [1]. In contrast, the northern regions of Hokkaido and Tohoku are expected to remain sunny [1].
Temperatures across major cities vary significantly by region. Tokyo and Fukuoka are both expected to reach high temperatures of 30 °C [1]. Osaka is forecast to reach 29 °C [1], while Sapporo will see a cooler high of 19 °C [1].
These conditions are driven by the influence of the rainy season front, which creates a pattern of fluctuating weather and intermittent precipitation [2]. Residents in the affected western and central regions should prepare for wet conditions as the system progresses east toward the capital.
“Rain clouds are moving across Japan from the west, bringing precipitation to four major regions by early afternoon.”
The arrival of the 'running rainy season' typically precedes the official start of the Japanese rainy season (tsuyu). This period of unstable weather often involves fluctuating temperatures and sudden rainfall, requiring increased vigilance for local infrastructure and travel planning across the western and central regions of Japan.
