May to September offers mild temperatures (15-18°C), minimal rainfall, and maximum sunshine—ideal for coastal activities and harbor exploration. April and October provide fewer crowds with pleasant spring/autumn weather. Winter (November-March) brings dramatic Atlantic storms, cooler temperatures (5-8°C), and frequent rain, but dramatic coastal scenery and quieter tourist experience. July-August attracts peak crowds to beaches and museums. Easter holidays and summer vacation periods see school-group visits. Avoid holiday weekends for less congestion.