Central Tokyo is forecast to reach 30°C on Sunday, May 17, 2024, marking the city's first "manatsubi" or summer day of the year [1].
This sudden spike in temperature arrives well before the typical summer peak, increasing the immediate risk of heat-stroke for residents and visitors who may not yet have adapted to high heat.
The Japan Meteorological Agency, via reporting by TBS NEWS DIG, said that about 160 locations from Kyushu to the Kanto-Koshin region are expected to see temperatures of 30°C or higher [1]. In Hiroshima, the area of Kake is specifically noted as a location that could reach 35°C [3].
Weather officials attributed the heat to stable high-pressure systems. These conditions are creating strong sunshine and high UV levels, factors that contribute to summer-like temperatures during mid-May.
While some reports indicate the heat will peak on May 17 and 18 with widespread temperatures above 35°C in the Tokai and Kanto-Koshin regions [4], other forecasts suggest these extreme temperatures will appear later in the week [1].
Authorities have issued heat-stroke warnings to the public. Officials said that residents should maintain precautions against the heat and stay hydrated as the temperature rises across the metropolitan area and surrounding prefectures.
“Central Tokyo is forecast to reach 30°C on Sunday, May 17, 2024.”
The arrival of a 'manatsubi' in mid-May indicates an unusually early onset of high temperatures for the region. When extreme heat occurs before the body has naturally acclimated to summer conditions, the risk of heat-related illness increases, placing additional pressure on public health systems and urban infrastructure.
