The median overnight interbank rate on the Egyptian pound fell to 12-1/2 percent on Sunday from 13 percent on Thursday in quiet trade in the middle of a central bank period for calculating banks' reserves, traders said.
The traders said demand fell as banks held back, waiting to see if rates would fall in the coming sessions.
The two-week period will end on October 25 and a new one will begin the following day.
Five out of nine banks contacted by Reuters had dealt in overnight money at rates between 11 and 14-1/2 percent, versus a range of between 11 and 13-1/2 percent on Thursday.
Five banks traded one-week money at rates of between 11-1/2 and 15-1/4 percent, compared with a range of between 12-1/2 and 14 percent on Thursday.
The overnight CAIBOR rate rose to 11.9762 percent from 11.9167 percent in the previous session. The one-week CAIBOR rate fell to 12.4405 from 12.4524 percent.
On the official foreign exchange market, the pound traded at a midrate of 6.24 in banks and exchange houses, the same as Thursday's weighted closing average.
Two market sources said the dollar was trading on the black market at around 6.26 pounds, around a recently heard figures.