The temperatures for the Sharm el Sheikh area are on average 18’C in the day , 15’C at night but the sea has a year round constant temperature of 21/22’C. As you go south from here the temperature will rise little by little. These are the average temperatures and can fall a little lower or reach a much higher figure. In general though very pleasant …Nei.
The only port of call north of Sharm el Sheikh is Aqaba and if you go to to Petra it will be even further north and may be cooler still....a good website for finding out temperatures is wunderground.com which has the facility for you to put in last years date and it will tell you what the temperature and weather was on that day at a given place....we have been in November and February when the temperature was in the seventies..