August 9th 1975 was a Saturday.
August 9th, 1979 fell on a Thursday.
August 13, 1975, was a Wednesday.
October 9th 1975 was a Thursday.
August 28 1975 was a Thursday.
21 August 1975 was a Thursday.
Tuesday, August 5, 1975
August 1, 1975 was a Friday.
August 8th, 1975 fell on a Friday.
It was a Wednesday.
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 30, 1975 fell on a Saturday.
August 5 1975 was a Tuesday.