You see a lot of 'fried egg' symbols in long-term Gran Canaria weather forecasts. That's because it's almost impossible to be accurate more than a few days ahead; unless you just assume that it's going to be sunny.
As a visitor you'll never know if you offend a Canarian; Their laid-back nature and years of dealing with tourists being everything from culturally insensitive to jaw-droppingly rude mean that the locals are masters of just letting it go.
Gran Canaria's resorts are choc-a-bloc this winter and bargain hotel and accommodation is been hard to find. The capital city Las Palmas, however, offers an alternative with some excellent hotels at great prices.