Sunan an Nasai 1522
The Book of Praying for Rain (Al-Istisqa')
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 (ﷺ) went out and prayed for rain, then he prayed two rak'ahs in which he recited loudly
Grading: Abu Ghuddah: Sahih · Al-Albani: Sahih · Zubair Ali Zai: Sahih Bukhari
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.