Japan is experiencing a nationwide heatwave with temperatures exceeding 30 °C continuing across the country this week [3].
The prolonged extreme heat poses significant public health risks and disrupts daily activity across diverse regions, from the northern reaches of Hokkaido to the southern islands of Kyushu.
Weather agencies, including the Japan Meteorological Agency, have tracked the rising temperatures across Kanto, Kansai, Kyushu, and Hokkaido [1]. Forecasters expect the trend of days exceeding 30 °C to persist throughout the week [3].
The current heat follows a volatile start to the summer. Some records indicate the first nationwide heat day occurred as early as June 1 [2], while other reports suggest the first heat day of the year was not recorded until July 18 in Toyooka, Hyōgo, and Hita, Ōita [5]. Earlier in the season, Owase, Mie, recorded a maximum temperature exceeding 35 °C on June 21 [1].
Extreme peaks have been observed in various prefectures. In Gunma, Isesaki reached a high of 41.8 °C on Aug. 5 [6]. Shizuoka recorded 41.4 °C on Aug. 6 [7], and Kitami, Hokkaido, saw temperatures hit 41 °C on July 24 [8].
Adding to the atmospheric instability, officials are monitoring Typhoon No. 6, which is expected to affect Okinawa and portions of Honshu [4]. The timing of the heatwave coincided with the end of a three-day holiday period, leaving many residents to face the extreme conditions as they returned to their regular routines.
Forecasters said the extreme heat remains a primary concern for the population as the summer progresses.
“Japan is experiencing a nationwide heatwave with temperatures exceeding 30 °C”
The recurrence of temperatures exceeding 40 °C in multiple prefectures, including the typically cooler Hokkaido, suggests a shift toward more extreme summer weather patterns in Japan. The overlapping threat of a nationwide heatwave and active typhoons increases the strain on national emergency services and public infrastructure.
