The last week of September hits all three notes at once
The Virgen de las Angustias procession on the last Sunday of the month, temperatures dropping to 22–25°C, and 55,000 university students back in the city: the last week of September is when Granada feels most like itself. The tapas bars on Calle Navas and around Campo del Príncipe fill with a local evening crowd rather than a tourist one. The Mirador de San Nicolás at sunset is still warm but not uncomfortable. This is the window to aim for if your dates have any flexibility.