Abbad bin Tamim narrates from his uncle (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) went out to supplicate for rain, and he (peace and blessings be upon him) turned his cloak around and supplicated.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الاستسقاء / 6413