أَخْبَرَنَا مُحَمَّدُ بْنُ رَافِعٍ، قَالَ حَدَّثَنَا يَحْيَى بْنُ آدَمَ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنِ ابْنِ أَبِي ذِئْبٍ، عَنِ الزُّهْرِيِّ، عَنْ عَبَّادِ بْنِ تَمِيمٍ، عَنْ عَمِّهِ، أَنَّ النَّبِيَّ صلى الله عليه وسلم خَرَجَ فَاسْتَسْقَى فَصَلَّى رَكْعَتَيْنِ جَهَرَ فِيهِمَا بِالْقِرَاءَةِ ‏.‏

It was narrated from 'Abbad bin Tamim from his paternal uncle that: The Prophet (PBUH) went out and prayed for rain, then he prayed two rak'ahs in which he recited loudly. Translation Not Available

Book Ref: Sunan An Nisai Book 17 Hadith 1522
Web Ref:  Sunan An Nisai Vol 2 Book 17 Hadith 1523