May 25 (Reuters) - Average 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 bills rose to 20.661 percent from 19.814 percent at the previous auction.

The yield on the 364-day bills rose to 20.588 percent from 19.698 percent previously.

(Reporting by Asma Alsharif; Editing by Elaine Hardcastle) ((asma.alsharif@thomsonreuters.com;))