It cools down in the fall.
秋天天气渐渐转凉。

Dialogue

A: Beautiful day, isn\'t it?
天气真好！
B: Yes. Enjoy it while it lasts. It\'s supposed to get cold tomorrow.
好极了。好好享受吧，明天可能会降温。
A: What\'s the weather forecast for today?
今天天气预报怎么说？
B: Sunny in the morning, but it\'s supposed to get cloudy and windy again this afternoon.
上午晴天，但是下午可能又要转阴刮风了。
A: Oh, I just hope it stays warm.
哦，我只希望一直暖和下去。