要下雨了用英语怎么说

要下雨了用英语可以说："It's going to rain."

这句话的来源可能来自于对天气的描述。

一些英文例句及其中文翻译可以是：

"It looks like it's going to rain soon." (看起来很快就要下雨了。)
"I heard on the weather forecast that it's going to rain tomorrow." (我听天气预报说明天要下雨。)
"I think I'll bring an umbrella just in case it rains." (我想我会带把雨伞，以防万一下雨。)