December is warm in a gentle, steady way. Expect around 21 to 23°C during the day, with plenty of sunshine in the south. It’s not peak beach heat, but you can sit outside comfortably.
Evenings are cooler, so a jacket comes back into play. The sea is cooler too, so swimming is brief unless you’re used to it.
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Christmas feels different here, warm air, bright skies, and a slower pace that feels far from winter back home.