Peak season (June to August): Lisbon in summer is bright, lively, and full of energy. Long daylight hours and clear skies make river views especially striking. However, it is also the busiest time, with higher demand for cruises and warmer temperatures during midday.
Off-peak season (April to May & September to October): The weather is warm and comfortable, crowds are lighter, and the overall pace feels more relaxed. The softer light during these months makes it an excellent time for photography and sightseeing from the water.
Low season (November to March): Lisbon becomes quieter and more peaceful during winter. Temperatures are cooler and there may be occasional rain, but the reduced crowds and calm atmosphere create a more laid-back cruising experience.