He was the eldest son of Thomas Whately of Epsom, Surrey and educated at Clare College, Cambridge (1745). He entered the Middle Temple in 1742 to study law and was called to the bar in 1751. He was an elder brother of the cleric Joseph Whately of Nonsuch Park, Surrey, and thus the uncle of Richard Whately. For many years he was in the close confidence of George Grenville, to whom he passed the political gossip. He also corresponded with Lord Temple, Lord George Sackville, and James Harris, M.P.