The Messenger of Allah said: "When it is very hot, then wait for it to cool down before you pray, for intense heat is from the flaring up of the Hell-fire." (Using translation from Ibn Mājah 678)
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «أَبْرِدُوا بِصَلَاةِ الظُّهْرِ فَإِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ»