Typical crowd level each month (relative), averaged over the attractions of each city. Shorter bar = fewer people.
Lisbon and Porto have broadly similar crowd levels overall.
Based on historical visitor patterns, January is usually the quietest month in Lisbon.
Based on historical visitor patterns, January is usually the quietest month in Porto.
In Lisbon the quietest day is usually Monday; in Porto, Monday. Weekdays early in the morning are the safest bet in both.
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