Meteorological forecasts warn of dangerous heat across the Kanto region next week, with temperatures expected to reach critical levels starting July 14 [1].
This extreme weather spike poses a significant public health risk, as the combination of high daytime peaks and warm nights increases the likelihood of heatstroke for residents and visitors.
Forecasts indicate that Tokyo could see temperatures hit 37 °C on July 14 [1]. In Gunma prefecture, the city of Tatebayashi is expected to reach an even higher peak of 39 °C on the same day [1]. Multiple locations across the Kanto region are forecast to exceed 35 °C next week [6].
The region has already experienced a buildup of seasonal heat. From July 8 to July 11, the area recorded four consecutive true-summer days [3]. This trend continued into Saturday evening, with temperatures in Shibuya observed at approximately 30 °C [4].
While the heat is the primary concern, short-term instability remains. Rain showers and possible thunderstorms are expected around noon on July 12 [5]. However, these brief disruptions are not expected to offset the broader shift toward a higher temperature phase [7].
Health officials said the risk of nocturnal heatstroke is high, as temperatures remain elevated after sunset. The general trend for the week of July 12–18 suggests a prevalence of true-summer days, characterized by temperatures remaining above 30 °C [7].
“Tokyo could see temperatures hit 37 °C on July 14.”
The forecast indicates a transition into a severe heat phase where the lack of nocturnal cooling prevents the human body from recovering from daytime heat stress. When temperatures in urban centers like Tokyo and Gunma approach 40 °C, the risk of heatstroke escalates rapidly, necessitating aggressive public health interventions and cooling center accessibility.
