Thursday.
You can find a day of week calculator at this site. Just enter in the date and it will calculate it for you:
http://www.searchforancestors.com/utility/dayofweek.html
what day of the week was august 20, 1955?
August 16th, 1955 fell on a Tuesday.
August 6th 1955 was a Saturday.
August 15 1955 was a Monday.
August 10th, 1955 fell on a Wednesday.
August 27, 1955 was a Saturday.
August 31st, 1955 was a Wednesday.
August 24, 1955 fell on a Wednesday.
August 13, 1955 fell on a Saturday.
August 16, 1955 fell on a Saturday.
August 4th, 1955 fell on a Thursday.
August 8, 1955 fell on a Monday.