In Cairo, and along the Nile River Valley, the climate is a hot desert climate and the air often becomes uncomfortably dry. Egypt is hot throughout the year. It is basically one big desert, it almost never rains (like 2 days a year), and the only thing you possibly have to worry about is a sandstorm. The sun will be extremely intense no matter the season you travel. Expect temperatures starting from 30° Celsius / 86° Fahrenheit and way above.
What to wear
Do remember that you will sweat quite a lot, there’s a lot of sand/dirt in the temple ruins, and also remember that sunscreen (mixed with sand) can leave ugly yellow stains on your clothes not easy to remove. So, rather pack a spare or two. And remember to bring at least one smart casual outfit for visiting mosques/good restaurants.
Shorts or short skirts as you see fit (covering the knee, if possible)
A couple of T-shirts
At least one shirt, blouse or smart looking top
One pair of long trousers
A veil/shawl (women only; you can buy it at most souvenir shops as well)
Swimsuit or bathing suit
Swim Tee / Rashguard
January entails nothing but hot and sunny weather in Cairo.The climate guarantees hours of sunshine each day, with very little expectation of any wet weather.Any wet spells should be infrequent and clear up quickly to reveal more clear skies and warm weather. The average daily temperature during this month in Cairo is 14 ℃.