Sayyiduna Amr bin Abasah (may Allah be pleased with him) narrates this saying of the Prophet (peace and blessings be upon him): "Offer the Zuhr prayer in the cooler time, for the intensity of the heat is part of the blazing heat of Hell."
Al-Tabarani recorded it in al-Mu'jam al-Kabir. Its chain contains a narrator, Sulayman bin Salamah al-Khaba'iri, and there is consensus that he is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 1703