It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "When the heat becomes intense, perform the prayer at a cooler time, because the severity of the heat is from the steam of Hell." Imam Darimi (may Allah have mercy on him) said: In my view, this applies to the time when the heat is distressing.