What does the scorching sun mean?

The blazing sun means that the weather is very hot.

From "Water Margin". The idiom comes from the 16th chapter of Shi Naian's "Water Margin" at the end of the Yuan Dynasty and the beginning of the Ming Dynasty, "Yang Zhi escorted the gold and silver load to Wu Yongzhi to take the birthday card": "The scorching sun is like fire, and the fields and rice are half withered. The farmer's heart is like boiling soup, and the prince, prince, and grandson Shake the fan."