 Weightman died at the age of 90 years on August 25, 1904 at his Ravenhill Mansion in Philadelphia, Pennsylvania.A posthumous portrait of William Weightman was also commissioned by his daughter Anne Weightman from the Swiss-born American artist Adolfo Müller-Ury; it was exhibited at the Corcoran Gallery in Washington and in Philadelphia in 1908.The University of Pennsylvania gymnasium, Weightman Hall (1903–05, Frank Miles Day, architect), adjacent to Franklin Field, is named for him.