It is narrated from Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him) that he said: We used to offer the Zuhr prayer with the Messenger of Allah (peace and blessings be upon him) at midday (in the intense heat). He (peace and blessings be upon him) said to us: "Pray the prayer when it has cooled, for the intensity of the heat is from the breath of Hell."
Abu Isa al-Tirmidhi said, according to what has reached me from him: I asked Muhammad (al-Bukhari) about this hadith, and he counted it as mahfuz (preserved).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2068