Supplications for drought, famine and rain
اَللّٰھُمَّ اسْقِنَاغَیْثًا مُّغِیْثًا مَّرِیْئًا مَّرِیْعًا نَّافِعًا غَیْرَضَاۗرٍّعَاجِلًاغَیْرَاٰجِلٍ
O Allah, send upon us helpful, wholesome and healthy rain, beneficial not harmful rain, swiftly and not delayed.
References
[Sunan Abu Dawud - 1169]