اللَّهُمَّ صَيِّبًا نَافِعًا
Allahumma sayyiban nafi'a
O Allah, let it be a beneficial rain.
The Prophet ﷺ would say this when he saw rain. Rain is a time when du'as are answered — the Prophet ﷺ said: "Two du'as are not rejected: the du'a at the time of the adhan, and the du'a at the time of rain."
Related Du'as
اللَّهُمَّ اسْقِنَا غَيْثًا مُغِيثًا مَرِيئًا مَرِيعًا نَافِعًا غَيْرَ ضَارٍّ عَاجِلًا غَيْرَ آجِلٍ
O Allah, send us rain that is helpful, productive, wholesome, beneficial and not harmful, soon and not delayed.
Sahihاللَّهُمَّ اسْقِنَا اللَّهُمَّ اسْقِنَا اللَّهُمَّ اسْقِنَا
O Allah, give us rain. O Allah, give us rain. O Allah, give us rain.
Sahihاللَّهُمَّ سُقْيَا رَحْمَةٍ وَلَا سُقْيَا عَذَابٍ وَلَا بَلَاءٍ وَلَا هَدْمٍ وَلَا غَرَقٍ
O Allah, let it be rain of mercy, not rain of punishment, nor calamity, nor destruction, nor flooding.
Hasanاللَّهُمَّ إِنِّي أَسْأَلُكَ مِنْ خَيْرِ مَا سَأَلَكَ عَبْدُكَ وَنَبِيُّكَ مُحَمَّدٌ وَأَعُوذُ بِكَ مِنْ شَرِّ مَا اسْتَعَاذَ مِنْهُ عَبْدُكَ وَنَبِيُّكَ
O Allah, I ask You for the good that Your servant and Prophet Muhammad ﷺ asked You for, and I seek refuge in You from the evil that Your servant and Prophet sought refuge from.
Hasan