Typhoon Ida, also known as the Kanogawa Typhoon , was the sixth-deadliest typhoon to hit Japan, as well as one of the strongest tropical cyclones on record. On September 20, Ida formed in the Western Pacific near Guam. It moved to the west and rapidly intensified into a 185 km/h (115 mph) typhoon by the next day. On September 22, Ida turned to the north and continued its quick rate of intensification. Two days later, the Hurricane Hunters observed a minimum barometric pressure of 877 mb (25.9 inHg), as well as estimated peak winds of 325 km/h (202 mph). This made Ida the strongest tropical cyclone on record at the time, although it was surpassed by Typhoon June 17 years later. Ida weakened as it continued to the north-northeast, and made landfall in Japan on southeastern Honshū with winds of 130 km/h (80 mph) on September 26. It became extratropical the next day, and dissipated on the September 28 to the east of the country. Ida caused torrential flooding to southeastern Japan, resulting in over 1,900 mudslides. Damage was estimated at $50 million, and there were 1,269 fatalities.

Typhoon Vera, also known as the Isewan Typhoon , was an exceptionally intense tropical cyclone that struck Japan in September 1959, becoming the strongest and deadliest typhoon on record to make landfall on the country as a Category 5 equivalent storm. The storm's intensity resulted in catastrophic damage of unparalleled severity and extent, and was a major setback to the Japanese economy, which was still recovering from World War II. In the aftermath of Vera, Japan's disaster management and relief systems were significantly reformed, and the typhoon's effects would set a benchmark for future storms striking the country.