http://www.bkafrica.com/E_Cairo.htm Usually dont post links here but there is a very basic B&K website on Egypt at this address. Simple information, full of Ken's pictures. Some of you may not know I have that website up.
There is a new ship from Oberoi on the NILE that is certainly worth considering as well. Not sure when I will get that on the web so many other things to do first.
Here is the link to the climate.
http://www.bkafrica.com/Q_Climate_Egypt.htm Just thought you might like to see this.