September featured all the days of the week that year.
September 20, 1955 was a Tuesday.
September 6, 1955 was a Tuesday.
1 September 1955 was a Thursday.
September 22nd 1955 was a Thursday.
September 23, 1955 was a Friday.
September 9, 1955 was a Friday.
September 11 1955 was a Sunday
September 27, 1955 fell on a Tuesday.
September 7, 1955 fell on a Wednesday.
September 25, 1955 occurred on a Sunday.
September 4, 1955 fell on a Sunday.
September 10th, 1955 fell on a Saturday.