He was the third son of Sir Herbert Westley of Westleigh, Devon, and his wife Elizabeth de Wellesley of Dangan, County Meath.
He lived for some time at Bridport and is known to have preached in the town's western suburb of Allington.
He lived in Charmouth for some time where he practised medicine and continued preaching in the West Dorset area.
The last years of his life were spent in seclusion at Lyme Regis, where he died at about the age of eighty-five; he was buried there on 15 February 1680.
He married (1619) Anne, daughter of Sir Henry Colley of Carbury, County Kildare, and granddaughter of Adam Loftus, primate of Ireland.