今天天气太热了用英语怎么说？

一般句 it is too hot today
不过也可以用下感叹句效果更好些
What a hot day (today is)!
或者 how hot today is!

It's too hot today .
天气太热，
It's very hot today.
今天真热

too hot today, 完整 ,it is too hot today. 用省略也能反映说话者一种因热而烦的心情.

It's a scorching day today.

It is rather too hot today.
It is extremely hot today.

It's too warm today.