The Messenger of Allah used to pray 'Asr when the sun was still hot and high, and if a person were to go to the suburbs (of Al-Madinah) he would be able to reach it while the sun was still hot and high.  

أَنَّهُ أَخْبَرَهُ أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يُصَلِّي الْعَصْرَ وَالشَّمْسُ مُرْتَفِعَةٌ حَيَّةٌ فَيَذْهَبُ الذَّاهِبُ إِلَى الْعَوَالِي وَالشَّمْسُ مُرْتَفِعَةٌ  

"The Prophet prayed the 'Asr when the sun was shining into my room and there were no shadows yet."  

صَلَّى النَّبِيُّ ﷺ الْعَصْرَ وَالشَّمْسُ فِي حُجْرَتِي لَمْ يُظْهِرْهَا الْفَىْءُ بَعْدُ