Ayesha reported,

The people complained to the Messenger of Allah ﷺ about the lack of rain, so he ordered that a pulpit be set up for him at the prayer ground, and he appointed a day on which the people would come out.Ayesha said, "The Messenger of Allah ﷺ came out just as the edge of the sun appeared. He sat upon the pulpit, pronounced the greatness of Allah, and praised Allah . Then he said, 'You have complained of the drought in your lands and of the rain holding back beyond its proper season. Allah has commanded you to call upon Him, and He has promised to answer you.'Then he said, "All praise belongs to Allah, Lord of all the worlds, the Most Compassionate, the Most Merciful, Master of the Day of Judgment" [Fatihah 1:2–4]. There is no god but Allah. He does whatever He wills. Allah, You are Allah, there is no god but You. You are the Rich and we are the poor. Send down upon us the rain, and make what You send down a strength for us and a provision lasting for a time."Then he raised his hands, and he kept them raised until the whiteness of his underarms could be seen. Then he turned his back to the people and turned his cloak inside out, still holding his hands raised. Then he faced the people again, came down, and prayed two units of prayer.Allah then brought forth a cloud, which thundered and flashed with lightning, and then it rained by the permission of Allah. He had not yet reached the masjid before the floodwaters were running. When he saw how quickly the people rushed for shelter, he ﷺ laughed until his back teeth showed, and he said, "I bear witness that Allah has power over all things, and that I am the servant of Allah and His Messenger."

عن عائشة قالت

شكى الناس إلى رسول الله ﷺ قحوط المطر! فأمر بمنبر، فوضع له في المصلى، ووعد الناس يوما يخرجون فيه، قالت عائشة: فخرج رسول الله ﷺ له حين بدا حاجب الشمس، فقعد على المنبر، فكبر، وحمد الله عز وجل، ثم قال: إنكم شكوتم جدب دياركم واستئخار المطر عن إيان زمانه عنكم، وقد أمر الله عز وجل أن تدعوه، ووعدكم أن يستجيب لكم، ثم قال: {الحمد لله رب العالمين الرحمن الرحيم ملك يوم الدين}، لا إله إلا الله يفعل ما يريد، اللهم أنت الله لا إله إلا أنت الغني ونحن الفقراء، أنزل علينا الغيث، واجعل ما أنزلت لنا قوة وبلاغا إلى حين ثم رفع يديه، فلم يزل في الرفع، حتى بدا بياض إبطيه، ثم حول إلى الناس ظهره، وقلب أو حول رداءه وهو رافع يديه، ثم أقبل على الناس ونزل، فصلى ركعتين، فأنشأ الله سحابة، فرعدت وبرقت، ثم أمطرت بإذن الله، فلم يأت المسجد حتى سالت السيول، فلما رأى سرعتهم إلى الكن ضحك ﷺ حتى بدت نواجده فقال: أشهد أن الله على كل شيء قدير، وأني عبد الله ورسوله.