The high season, from October to April, generally offers the mildest conditions. But the mildest temperatures still bring midday sun beating down, and winter nights can prove surprisingly chilly to those unaccustomed to desert extremes. When it does rain (though it’s unlikely), it’s usually in winter.
Weather-wise, the most challenging time to visit Cairo is summer, when temperatures soar and nights offer little respite. The low season runs from May to September, but July and August are the hottest months. Visitors that don’t mind a little warmth can find deals in May without suffering the full brunt of the summer heat. But don’t jump too quickly: Spring is also sandstorm season. Sweltering dusty winds blow up from the Sahara and make the city barely breathable.
Cairo has long-standing populations of major religious groups and past colonial powers, so it’s possible to find celebrations for most every major holiday. Islam, however, is the prevailing force here, and the month of Ramadan is one of the most pronounced Islamic holidays. It happens in July or August, and during this time, some shops and restaurants may stay closed during the daytime fast. After sundown, the city will erupt with feasts and celebrations that last into the early hours.