noun
beginning of autumn; early autumn
Refers to the period when autumn is just starting, typically around September in Japan. Often used in weather forecasts, seasonal greetings, and descriptions of seasonal changes.
秋口になると、朝晩は涼しくなる。
In early autumn, the mornings and evenings become cooler.
秋口に台風がよく来る。
Typhoons often come in early autumn.