在英语中，可以用以下几种方式来表达天气很热：

It's hot today.
今天很热。
The weather is hot.
天气很热。
It's a hot day.
今天很热。

来源：这些表达方式都是用来描述天气状况的常见表达方式。

一些英文例句及其中文翻译如下：

It's so hot outside. I can't stand it.
外面真热，我受不了。
The temperature is going to be in the 90s today.
今天温度将达到九十多度。
It's a scorching hot day. Make sure to stay hydrated.
今天酷热难耐，一定要保持足够的水分。