It's raing提问raing

What's happening?

What is the weather like now?

what is the weather like?

应该是It's raining.吧
换成疑问句： Is it raining?
如果是就你这句话提问，则应该是（特殊疑问句）：What's the weather like?

What is the weather like?

What is the weather like? 或：How is it today?
it 在英语中常用于表示天气、距离、金钱等