Porto vs Lisbon

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Lisbon edges ahead as the better destination in September. Lisbon offers 11 hours of daily sunshine with only 4 rain days, while Porto sees 10 sunshine hours and 6 rain days.

Porto sits in the comfortable travel range at 24°C. Lisbon is also comfortable at 25°C.

For travelers who prioritize dry weather, Lisbon is the stronger choice in September. Lisbon receives 1 more hour of sunshine per day, which matters for sightseeing and outdoor activities.

Porto reaches an average high of 24°C (75°F) and drops to 16°C (61°F) at night during September. The daily temperature range is 8°C, meaning moderate variation throughout the day.

Lisbon averages 25°C (77°F) for the high and 18°C (64°F) for the low, with a daily range of 7°C. The two cities feel quite similar in terms of temperature.

Both cities are in the Northern Hemisphere, so they share the same seasonal pattern in September.

Porto receives approximately 64 mm of rainfall across 6 rain days during September. Rain is occasional, so a light rain jacket should suffice.

Lisbon sees 29 mm over 4 rain days. That makes Lisbon the drier option by 2 rain days and 35 mm of total precipitation.

Both cities share similar humidity levels at 65%.