CAIRO, Aug 7 (Reuters) - Yields on Egypt's three-month treasury bills fell and yields on nine-month bills rose at Sunday's auction, data from the central bank website showed.

The average yield on the 91-day bill dropped to 14.089 percent from 14.212 percent at the last auction on July 31. The 273-day bill rose to 15.730 percent from 15.653 percent at a similar auction a week ago.

(Reporting by Ola Noureldin)