Islam > Adhkar > Ad iya ammah > Supplication when rain falls
اللهم صيباً نافعاً
Allahumma sayyiban nafi'an.
"O Allah, a beneficial rain."
al-Bukhari with Fath al-Bari 2/518
إِنَّ ٱللَّهَ وَمَلَٰٓئِكَتَهُۥ يُصَلُّونَ عَلَى ٱلنَّبِىِّ ۚ يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ صَلُّوا۟ عَلَيْهِ وَسَلِّمُوا۟ تَسْلِيمًا
God and His angels shower their blessings on the Prophet. O believers, you should also send your blessings on him, and salute him with a worthy greeting.
Al-Ahzab 33:56