Winter in the Canary Islands is relative. While there are an average of three rainy days in November you get six hours of sunshine every day. Day temperatures are about 24ºC on average and the minimum temperature at night is 18ºC. Days when the mercury hits 30ºC are common.
The sea is still warm in November and is 22ºC on average. Its much warmer in shallow water and the sun is strong enough to keep the swimming pools at an ideal temperature.
Walkers flock to Gran Canaria in November as the top of the island is still warm and sunny. You do get cold, cloudy days in the Cumbres so bring a fleece or a windcheater. You still need a hat and plenty of water as the sun beats down on hot days.
You can sit o the beach in Gran Canaria in November and it still feels like midsummer anywhere else. It cools down as the sun sinks but you are guaranteed a tan if you come to Gran Canaria in November.