What do you mean by late autumn and late autumn?

The end of autumn; September of the lunar calendar.

Late autumn refers to the summer calendar around September: climbing in late autumn.

It's almost late autumn, and it's raining in Mao Mao.

"Rosemary Fu" of the Three Kingdoms Wei Dynasty: "The fragrance of autumn is the wisdom of Kunlun Mountain." The Book of Beginners (Volume 3) is quoted by Emperor Liang Yuan of the Southern Dynasties: "September is autumn, also known as late autumn." The third time in Tang Dynasty: "It's already late autumn, and the west wind is rustling." Feng Zhi's Wu Zixu VII: "It's late autumn, but the flowers and plants in the garden are still charming in spring."