Day was married to Al Jorden from 1941 until they divorced in 1943. She was married to George Weidler from 1946 until they divorced in 1949. She was married to Martin Melcher from 1951 until his death in 1968. She was married to Barry Comden from 1976 until they divorced in 1981. Day had a son, Terry Melcher (1942–2004), with Jorden.