اللَّهُمَّ صَيِّبًا نَافِعًا
Allahumma sayyiban nafi'a
O Allah, let it be a beneficial rain.
Sahih Al-Bukhari
مُطِرْنَا بِفَضْلِ اللَّهِ وَرَحْمَتِهِ
Mutirna bifadlillahi wa rahmatihi
We have been given rain by the grace and mercy of Allah.
Sahih Al-Bukhari 1:147, Sahih Muslim 1:58
سُبْحَانَ الَّذِي يُسَبِّحُ الرَّعْدُ بِحَمْدِهِ وَالْمَلَائِكَةُ مِنْ خِيفَتِهِ
Subhanal-ladhi yusabbihur-ra'du bihamdihi wal-mala'ikatu min khifatihi
Glory be to Him whom the thunder glorifies with His praise, and the angels out of fear of Him.
Al-Muwatta' 2:992