1.
autumn rain; fall rain
Rain that falls during autumn, or the rainy period in autumn (typically September to October in Japan). Also refers to the autumn rain front (秋雨前線).
Weather
The 秋雨前線 (autumn rain front) is a weather pattern that brings extended rain to Japan from late August through October, similar to the 梅雨前線 (rainy season front) in early summer.