It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to pray Asr (at a time) when the sun was clearly high and bright, and if someone went to the upper part of Madinah (al-Awali), the sun would still be clearly bright.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2073