All four official climbing routes to the summit of Mount Fuji are now open to the public [1].
The seasonal opening coincides with an unexpected and intense heat wave, creating unusual conditions for hikers at high altitudes. This weather shift has forced climbers to adapt their gear and has increased the demand for emergency medical services on the mountain.
The Fuji-Miyama and Gotemba routes opened July 10 [2], completing the accessibility of all four paths, which also include the Subashiri and Yoshida routes [1]. Despite the high elevation, temperatures remained unusually warm. At the 5th station, located approximately 2,400 meters above sea level, directors Goro Uchida and Kazuki Yatani said the heat was significant enough to make hikers sweat [1].
Observers noted that many climbers were wearing short sleeves and shorts, clothing typically unsuitable for the rapid temperature drops associated with the summit. One climber from Saitama said they wore light clothing to avoid getting chilled by sweat, though they kept rain gear and a down jacket in their bag [1].
Emergency services remained on standby to manage the influx of visitors. A rescue team treated one climber for a hand injury at the 9th station [1], according to reports from the field. The presence of rescue teams is standard during the opening period, but the "disaster-level" heat has added a layer of complexity to hiker safety [1].
Mount Fuji remains Japan's highest peak and attracts thousands of visitors each summer. The opening of the final routes marks the official start of the peak climbing season, though the current weather patterns are atypical for the region's historical norms [1].
“All four official climbing routes to the summit of Mount Fuji are now open to the public.”
The occurrence of a 'disaster-level' heat wave during the opening of the climbing season suggests a volatility in high-altitude weather patterns. While light clothing prevents immediate overheating, the discrepancy between the warmth at the 5th station and the freezing temperatures at the summit increases the risk of hypothermia for unprepared hikers, placing additional pressure on rescue teams.
