Abbad bin Tamim narrates from his uncle (may Allah be pleased with him) that he said: The Messenger of Allah (peace and blessings be upon him) went out with the people to seek rain. He (peace and blessings be upon him) prayed two rak'ahs, reciting aloud in them, turned his cloak around, asked for rain, and faced the qiblah. Someone other than him added, narrating from Abd al-Razzaq: And he (peace and blessings be upon him) supplicated with his hands raised and asked Allah Almighty for rain.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الاستسقاء / 6399