اللَّهُمَّ أَسْقِنَا غَيْثاً مُغِيْثاً مَرِيْئاً مَرِيْعاً، نَافِعاً، غَيْرَ ضَارٍّ، عاجِلاً غَيْرَ آجِلٍ

O Allāh, send upon us helpful, wholesome and healthy rain, beneficial not harmful rain, now, not later.

Reference: O Allāh, send upon us helpful, wholesome and healthy rain, beneficial not harmful rain, now, not later. Abū Dāwud (#1169, 1/303). Al-Albānī declared it authentic in _Ṣaḥīḥ Abū Dāwud_ (1/216).