Given its size and influence, Waterdeep was a cosmopolitan city with a diverse population of citizens. While humans comprised the majority of its populace, it was home to large number of elves, predominantly moon elves, dwarves, lightfoot halflings, half-elves and gnomes. Waterdhavians tended to be social, stalwart and outspoken people who maintained a worldly perspective of the cultures throughout Toril. While they were proud of their realm's history, they typically kept from dismissing cultures from foreign lands. While they often sought the improvement of their lives through the accumulation of wealth and self-importance, as a people, they would not stand for military conquest or the thought of imperialization.
Fashion
Waterdhavian culture was called for a sort of resigned display of status when it came to the clothes one would wear. While all manner of dress could be seen on the city streets, guild members would only don their livery when conducting official business or meetings, during important holidays or while on ventures outside Waterdeep proper. Nobles would only display their crests or coat-of-arms in subtle affectations, such as a signet ring or other understated jewelry, while their servants wore clothes that were fully emblazoned with their house heraldry.
In contrast, women were known to maintain a high sense of fashion, often wearing elegant silk gowns, furs and sparkling jewelry, as the season dictated.
Religion
Waterdeep had a huge variety of faiths, and the odds were that if a deity was worshiped somewhere in Faerûn, it had at least a follower (or likely a wandering priest or two, and maybe a shrine) in the City of Splendors. The largest temples in the city were dedicated to Oghma, Tyr, Tempus, Gond, Selûne, Mystra, Silvanus and Mielikki, Lathander, Sune, Tymora, along with and a temple dedicated to Baravar Cloakshadow located within the Warrens beneath Waterdeep. There was also a large temple known as the Plinth, which was open to all faiths,
In addition to the city's famous temples, a number of minor shrines and other holy houses could be found in Waterdeep. Among the deities venerated at these sites were the Grain Goddess Chauntea, Lliira, as well as the two powers that were considered to be "local divinities", Sharess, and Siamorphe. Waterdeep even housed the cult of Ao that became active in the city for a short while following the Time of Troubles.
As was found in many metropolises in the Realms, Waterdeep housed a great many secret places of worship where devotees of dark powers could exercise their secretive faiths. Waterdeep held secluded shrines and temples held in undisclosed locations to Cyric, Shar, and at least two of Deities of Fury in Auril and Umberlee. Even marginalized groups such as the Cult of the Dragon and so called "beast cultists" could meet within the city to conduct the business related to their malevolent deities.
Although the faith of Talona was considered misguided or bad, it did not mean small groups of lay followers could not practice their personal faith. However, the building of a public house of worship to her was forbidden in Waterdeep. It was also illegal to form a public priesthood dedicated to her.
As of the early 1490s DR, a new temple to Valkur had already been built in the city. In the same year, the returned drow goddess Eilistraee was witnessed as she danced in the moonlight, near the walls of the city, up the road to Amphail. This led many of her followers to Waterdeep, with the goal of creating a shrine to their goddess within its walls. The project was supported by the Harper leading delegate Remalia Haventree.
Festivals and Holidays
In addition to the standard festivals of the Calendar of Harptos, there were several festivals and holy days held in Waterdeep:
- Ahghairon's Day: A holiday celebrated on the first day of Eleasias, commemorating Ahghairon's birthday. It consisted of small details, like toasting for the Lords; leaving violets at the base of Ahghairon's Tower, the Plinth, or atop the altars of the House of Wonder; and bards performing songs in honor of the Old Mage. The Open Lords visited taverns and inns across the city, to wish the people well.
- Auril's Blesstide: Held on the day of winter's first frost, this day saw everyone in the city wearing white clothes, not serving or eating hot meals, and a parade of naked men and women wearing only white cloaks going from Cliffwatch in the North Ward, across the city and to the beaches. There, participants dived into the icy waters, sacrificing their warmth to the Frostmaiden.
- Fleetswake: A festival celebrating the sea, the sea trade and the gods of the sea. It spanned the last tenday of Ches, and included boat races, the Shipwright's Ball at the Shipwright's House, and guild-sponsored galas at the Copper Cup festhall. The festival was concentrated in Dock Ward and the Fiery Flagon in Sea Ward.
- Lliira's Night: A celebration honoring the Lady of Joy with dances and balls, held the night of Flamerule 7. Although the celebration was shared all over the city in many festhalls, the highlight of the night was the Cynosure Ball, which was sponsored by the Lords, the local clergy of Lliira, and several noble families.
- Trolltide: This lesser holiday celebrated the end of the Second Trollwar at the start of Kythorn. On this day, Waterdhavian children would run about the city, dressed as trolls demanding treats from citizens and shop owners lest the children pull pranks on them at sundown.