A rainy-season front is bringing localized showers and thunderstorms across several regions of Japan on Thursday [1].
These weather patterns are critical as they signal the official start of the rainy season for specific regions and increase the risk of localized flooding. The advancing front, combined with a low-pressure system and cold air aloft, is driving the current volatility [1].
Rain is currently spreading across the Kanto-Koshin and Tohoku regions, where localized showers are expected [1]. Meanwhile, the Kyushu region is experiencing thunderstorms [1]. Forecasters said that rain will extend across the entire country over the weekend of June 20-21 [1].
Certain areas are expected to formally enter the rainy season this weekend, specifically parts of Hokuriku and southern Tohoku [1].
Temperature forecasts for today vary significantly by region. In the north, Sapporo is expected to reach 29°C [1], while Kushiro will be cooler at 17°C [1]. Aomori and Sendai are both forecast at 24°C [1], with Morioka reaching 27°C [1].
Central and western regions show higher peaks. Niigata is forecast at 30°C [1], and Nagano is expected to hit 31°C [1]. Kanazawa and Osaka are both projected at 29°C [1]. Nagoya is forecast to reach 32°C [1], the highest among the major cities listed [1].
In the south, Tokyo is expected to reach 24°C [1]. Okayama is forecast at 30°C [1], while Hiroshima, Kochi, and Osaka are all projected at 29°C [1]. Matsue and Fukuoka are forecast at 31°C [1], and Naha is expected to reach 30°C [1]. Kagoshima is forecast at 27°C [1].
“Rain will extend across the entire country over the weekend of June 20-21.”
The movement of the rainy-season front (梅雨前線) marks a transition into a period of high humidity and frequent precipitation. For the Hokuriku and southern Tohoku regions, this formal entry into the rainy season often correlates with increased landslide risks and disruptions to transportation, requiring heightened public vigilance and infrastructure monitoring.
