His paternal uncle had told him that he went out with the Messenger of Allah (ﷺ) to pray for rain. He turned his rida' around, and turned his back to the people, then he prayed two rak'ahs and recited loudly.
Sunan an-Nasa'i Book 17, Hadith 6
← Previous Hadith His father said: "I asked Ibn 'Abbas how the Messenger of Allah (ﷺ) prayed for rain. He said: 'The Messenger of Allah (ﷺ) went out (dressed) in a state of humility, beseeching and humble. He sat on the minbar but he did not deliver a Khutbah like this Khutbah of yours, rather he kept supplicating, beseeching and saying the takbir, and he prayed two rak'ahs as he used to do during the two 'Eids.'"

Sunan an-Nasa'i Book 17, Hadith 5 Next Hadith → The Prophet (ﷺ) prayed for rain, and prayed two rak'ahs, and turned his rida' around.

Sunan an-Nasa'i Book 17, Hadith 7