Central Tokyo is forecast to reach 30°C today, marking the first true summer day of the year [1].
The sudden heat wave creates significant health risks for millions of people attending large public gatherings, including those participating in traditional festivals. Unseasonably hot weather comparable to July has prompted heat-stroke warnings across the country.
In Asakusa, the Sanja Matsuri festival continues to draw approximately 1.8 million annual visitors [1]. The combination of dense crowds and high temperatures has created dangerous conditions for those carrying the mikoshi, or portable shrines. Thermal camera readings near the shrines showed temperatures around 30°C, with occasional spikes reaching 40°C [1].
One festival participant carrying a mikoshi said the weather this year is abnormal and that the air becomes so thin it is nearly impossible to breathe.
Visitors are taking precautions to manage the heat. A child attending the festival said they bought a treat to help cool down from the inside [1].
The heat follows a trend of rising temperatures in the region. Central Tokyo observed a temperature of 27.0°C yesterday [1].
Despite the heat, the event remains a major draw for international visitors. A British tourist said the energy of the large shrines being carried is wonderful and provides a great sense of live action [1].
““This year is abnormal... almost impossible to breathe.””
The arrival of 30°C temperatures in mid-May suggests a shift in seasonal norms for Japan. When extreme heat coincides with high-density cultural events like the Sanja Matsuri, the risk of mass heat-stroke incidents increases, potentially straining local emergency services and requiring more aggressive public health interventions during traditional spring festivities.
