CAIRO, Oct 20 (Reuters) - Yields on Egypt's six-month and one-year treasury bills rose at an auction on Thursday, data from the central bank showed.

The average yield on the 182-day bill inched up to 15.873 percent from 15.800 percent at the last auction, on Oct. 13, and the yield on the 357-day bill also rose to 16.503 percent from 16.442 percent at the last similar auction.

(Reporting by Ola Noureldin; Editing by Louise Ireland) ((Ola.Noureldin@thomsonreuters.com;))