Four words to describe the particularly hot weather.

The sun is like fire: the sun is like fire. It describes the weather as very hot.

Unbearable heat: describe it as very hot and unbearable.

Chairs and mats are very hot: chairs and mats feel very hot, describing the hot weather.

Scorching sun: describes the intense sunshine in summer. It can also be called "scorching sun". For example, "the scorching sun is like fire."

Summer is hot: the sun is very strong and very hot in summer.