Cascais

Spring (Mar–May): mild, pleasantly warm (roughly 12–20°C), shoulder season with blooming gardens and fewer crowds—good for sightseeing and outdoor festivals or cultural events. Summer (Jun–Aug): sunny and warm (about 22–28°C), peak season—beaches, open‑air concerts, sailing regattas and lively nightlife; expect crowds and higher prices. Autumn (Sep–Nov): warm early then cooling (20→12°C), quieter after September—great for walks, surfing as swells increase, and harvest/food events; fewer tourists and better deals. Winter (Dec–Feb): mild but wetter (8–15°C), off‑peak with low prices and short queues—ideal for museums, coastal walks, holiday markets and local festivities like Carnival preparations.