Japan is preparing for early-season heavy rain in southern Tohoku and a sharp temperature increase in Nagoya on June 21 [1, 2].
These disparate weather patterns highlight the volatile transition into the rainy season, posing simultaneous risks of flooding in the north and heat stress in central regions.
Forecasters from TBS NEWS DIG said there would be intense rain, specifically targeting southern Tohoku [1]. The Hokuriku region is also facing possible heavy rain beginning tonight and lasting into tomorrow morning [1]. These conditions are attributed to the onset of the rainy season [2].
While the north faces precipitation, central Japan is experiencing typical early-summer heating [2]. Nagoya is expected to see a significant temperature rise to 32°C [2]. Other regions are following a similar warming trend, with Kochi also reaching 32°C [2], while Kagoshima and Naha are forecast at 31°C [2].
Temperature variations remain stark across the archipelago. In the north, Sendai and Morioka will remain cool with maximum temperatures around 20°C [2]. Aomori is expected to reach 21°C [2], while Kushiro will be the coolest at 15°C [2].
Other major cities will see moderate warmth. Tokyo and Kanazawa are both forecast to reach 27°C [2]. Osaka, Okayama, Hiroshima, and Fukuoka are all expected to hit 28°C [2]. In the Hokuriku and Chubu regions, Niigata is forecast at 24°C [2], Kanazawa at 27°C [2], and Nagano at 30°C [2]. Sapporo is expected to reach 25°C [2].
The forecast was provided by TBS NEWS DIG and reproduced by MSN Japan [1, 2].
“Nagoya is expected to see a significant temperature rise to 32°C”
The simultaneous occurrence of heavy rainfall in Tohoku and high heat in Nagoya underscores the complex atmospheric shifts during Japan's transition into the rainy season. The significant temperature gap between the northern and southern regions—ranging from 15°C in Kushiro to 32°C in Nagoya—demonstrates the localized nature of early-summer weather patterns and the immediate need for regionalized disaster preparedness.
