Narrated Aisha, Ummul Mu'minin: When the Prophet (ﷺ) saw a cloud formation in the sky, he left work, even if he were at prayer, and then would say: "O Allah! I seek refuge in Thee from its evil. " If it rained, he would say: "O Allah! send a beneficial downpour"
SahihSahihSahihBook 43 · Hadith 327