今天好热用英语怎么说？答案是：It's hot today。

来源：这个表达是直接翻译英文短语 it's hot today 的，it 是缩写形式的它，hot 是热的，today 是今天的意思。

例句：

It's hot today, so I'm going to wear a t-shirt and shorts.

(今天好热，所以我要穿T恤和短裤)

I can't believe how hot it is today.

(真难以置信今天有多热)

Today is so hot that I'm sweating just sitting here.

(今天太热了，我坐在这里都在流汗)