在英语中，形容温度高的词汇和短语有很多，以下是一些常用的表达方式：

Hot：

热的，温度高的，使人感到热的。

例句：It is as hot as a sauna. 这天气简直就像在蒸桑拿。

Stifling：

闷热的；湿热的（比较潮湿的气候）。

例句：The stifling heat in the room made it difficult to breathe.

scorching：

酷热的，灼热的。

例句：The scorching sun was blazing down on us.

sweltering：

闷热难耐的。

例句：We were sweltering in the summer heat, wishing for a cool breeze.

boiling：

沸腾的，极热的。

例句：The water in the pot was boiling, ready to be served.

ferocious：

猛烈的，狂暴的（常用来形容高温）。

例句：The ferocious heatwave has caused widespread power outages.

unbearably hot：

无法忍受地热。

例句：The temperature was unbearably hot, making it hard to do anything outside.

sweltering heat：

闷热。

例句：We were suffering from sweltering heat all day long.

scorching sun：

烈日。

例句：The scorching sun was shining brightly in the sky.

熔化：

像熔化一样热。

例句：The metal was glowing red-hot, almost melting.

这些词汇和短语可以帮助你更生动地描述高温天气。根据具体的情境和感受，选择合适的词汇来表达你的意思。