The hottest place in Spain for Christmas is undoubtedly the Canary Islands, specifically the southern parts of Tenerife and Gran Canaria. While mainland Spain experiences true winter weather, the Canaries are located off the coast of Africa and enjoy a "sub-tropical" climate year-round. In cities like Maspalomas or Los Cristianos, daytime temperatures at Christmas typically reach between 20°C and 25°C (68°F to 77°F), making it one of the few places in Europe where you can sunbathe on the beach in December. On the Spanish mainland, the Costa del Sol (specifically Málaga) and the city of Almería are the warmest spots, often seeing temperatures around 17°C to 19°C (63°F to 66°F) with plenty of bright sunshine. While you might not be swimming in the Mediterranean at that temperature, it is still significantly warmer than Northern Europe. For the absolute maximum heat, however, travelers head to the "islands of eternal spring," where the Christmas trees are often set up on the sand under clear blue skies, offering a bizarre but delightful holiday experience.