 Wemyss was promoted to Admiral of the Fleet on 1 November 1919 and was raised to the peerage as Baron Wester Wemyss, of Wemyss in the County of Fife on 18 November 1919.In retirement he wrote his memoirs under the title "The Navy in the Dardanelles Campaign" and became a Non-Executive Director of Cable & Wireless.He lived in Cannes where he died in his garden on 24 May 1933.