What day of the week was September 18, 1961?

The day of the week September 18th, 1961 fell on was a Monday.

James Gandolfini the American actor (d. 2013) was born on 18 September in 1961. As was Konstantin Kakanias the Greek painter and multimedia artist , Mark Olson the American singer-songwriter and guitarist (The Jayhawks and Original Harmony Ridge Creekdippers) , Lori and George Schappell the American conjoined twins .

Dag Hammarskjöld the Swedish economist and diplomat, 2nd Secretary-General of the United Nations, Nobel Prize laureate (b. 1905) died on this day in 1961.

U.N. Secretary-General Dag Hammarskjöld dies in a plane crash while attempting to negotiate peace in the war-torn Katanga region of the Democratic Republic of the Congo.