When to Go in Al Qahera - Cairo

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When to Go
Egypt is best visited in the fall (Sept-Nov) and spring (Feb-Apr). The weather is relatively chilly December through January, except in the south, where the winter is very pleasant. The summer is the only time to be avoided for climatic reasons. Cairo is hot, muggy, and filthy for most of June through August, and most residents take their vacations during this period, if possible. Upper Egypt and even the Red Sea coast can also be uncomfortably hot during the summer.
High and low seasons follow a combination of weather patterns and school holidays. Thus, summer in Upper Egypt is low season because of the heat (despite the summer holidays), and winter is high season, with the market peaking around Christmas, New Year's, and Easter. The same is true for Cairo and the Red Sea, though with less dramatic fluctuations. Winter is low season in Alexandria and along the north coast, but temperatures are relatively cool and the wind picks up. During the summer, with Egyptian schools on holiday and the unpleasant Cairo climate in stark contrast to the moderate warmth of the Mediterranean, the high season takes the north coast with a vengeance.
To avoid the crowds, go against the seasons, but be prepared for some serious heat if you're headed for Upper Egypt during the summer. Luxor in August is not for the faint of heart, and venturing out to the sights without a fairly serious sunblock, an extravagantly brimmed sun hat, and a couple of liters of water is simply unwise. Personally, I would try to stay at the margins of the high season and visit around the first 2 weeks of November or June. The same goes for Cairo, the Red Sea coast, and the Sinai.
The main thing to watch on the north coast is the Egyptian school schedules. Once the Egyptian schools and universities let out, cities and beaches on the Mediterranean become very noisy and crowded, and Western tourists, women in particular, will find themselves subject to substantial unwelcome attention. For this reason, I would advise visiting Alexandria in March and April or October and November.

Source www.egyptlastminute.com