When September comes, it Starts to get cooler.

当九月到来时，天气开始变冷。

youdao

When September comes, it starts to get cooler, so after Labour Day we start classes.

九月到来，天气开始变凉，所以劳动节后我们开始上课。

youdao

When September comes, it starts to get cooler, so after Labour Day we start classes.

九月到来，天气开始变凉，所以劳动节后我们开始上课。

youdao