Japan is expecting its first 40 °C “extremely hot day” of the year on July 31, 2026 [4].
This temperature spike signals a dangerous shift in regional weather patterns, prompting national weather services to issue disaster-level heat warnings to prevent heat-related casualties.
The Japan Meteorological Agency (JMA) attributed the extreme conditions to a persistent double high-pressure system dominating the region. This meteorological phenomenon is driving temperatures upward across the country, creating what officials describe as disaster-level heat.
“We are expecting disaster‑level heat tomorrow, with temperatures possibly reaching 40 °C,” a JMA spokesperson said. “Please stay hydrated and avoid outdoor activity during the hottest hours.”
The forecast follows a significant temperature event in Fukuchiyama, Kyoto Prefecture. On July 30, 2026, the city recorded a maximum temperature of 40 °C [1, 2]. This reading is particularly notable for its rarity in the area.
“The 40 °C reading recorded in Fukuchiyama is the first in the Kinki region since 1994, marking a 31‑year gap,” a Livedoor News reporter said [3].
National weather services continue to monitor the double high-pressure system as it spreads heat nationwide. An ANNnewsCH anchor said that July 31 could see the first 40 °C day of the year as the system continues to dominate the weather pattern.
Authorities are urging the public to take immediate precautions against the heat. The JMA has emphasized the need for hydration, and the avoidance of outdoor exertion during peak temperature hours, to mitigate the risks associated with this extreme weather event.
“Japan is expecting its first 40 °C “extremely hot day” of the year on July 31, 2026.”
The return of 40 °C temperatures to the Kinki region after 31 years suggests a significant intensification of summer heatwaves in Japan. The presence of a double high-pressure system creates a 'heat dome' effect, trapping hot air and making it difficult for temperatures to drop, which increases the risk of heatstroke and puts extreme pressure on the national power grid due to air conditioning demand.
