Alameda de Hércules in September

March through May brings perfect weather and the square at its most alive. Temperatures hover around 20°C, perfect for outdoor tables and evening strolls. October and November offer the same sweet spot — warm days, cool nights, and fewer crowds than spring. But here's what the guidebooks won't tell you: summer is brutal. July and August see temperatures hit 40°C, and the square becomes a concrete oven. Locals flee to the coast, leaving behind empty bars and wilted tourists. Winter brings its own charm, though. December through February means cozy indoor bars, hearty stews, and a more authentic local vibe. The Christmas market in December adds festive energy, though it can get crowded. Avoid Easter week unless you enjoy shoulder-to-shoulder crowds and inflated prices. The sweet spot? Late October, when the summer heat breaks but the nightlife energy remains high.