Friday
This varies from year to year. The 13th, August, 2010, is a Friday.
13th August 1983 was a Saturday
13th, August, 1994, was a Saturday,
January 13th 2010 was a Wednesday.
August 13, 1996 was a Tuesday.
May 13th, 2010 fell on a Thursday.
Tuesday
Friday
Saturday
Monday
Wednesday.
August 13th 1966 was a Saturday.