August 9, 1959 was Sunday.
It was a Tuesday.
August 9th, 1979 fell on a Thursday.
August 11th, 1959, was a Tuesday.
25th August 1959 was a Tuesday.
August fourth 1959 was a Tuesday.
The 9th of August can occur on any day of the week. As the question was asked in July 2014, it is possible you were referring to August of 2014, in which case the answer is Saturday.
August 17 1959 was a Monday.
August 14, 1959 fell on a Friday.
August 2, 1959 fell on a Sunday.
August 26, 1959 fell on a Wednesday.
August 4, 1959 fell on a Tuesday.
August 17, 1959 fell on a Monday.