monday
It was a Monday.
Sunday
It was a Monday.
It was a Friday.
Monday
10th August 1995 was a Thursday.
August 13 1985 was a Tuesday.
August can start on any weekday or any weekend day, so there is no single answer to the question without specifying a particular year.
July 3rd falls on a weekday 71.5% of the time.
World War I began Officially in August 3rd of 1914
In the US, August 1st, 1993 fell on a Sunday
It was a Friday. See link for more.