Hot summer, just shorts and sun protection. During winter air around 20°C (November till April) and water 18-20°C in the coldest days (January). When it's cold they use long wetsuits, but most of the time you can ride without wetsuit or in a short 2-3mm wetsuit.
Get to Sharm el Sheikh on the Sinai peninsula. Drive towards the West coast and then to the south tip of the Sinai. To reach this place you need to go off road from the main street. It's just outside the national park of Ras Mohamed (10 km).