Days Bay is a residential area in Lower Hutt in the Wellington Region of the North Island of New Zealand. It is walled on three sides by steep bush-clad slopes. Most of its level land is occupied by Williams Park and an independent boys' primary school, originally a part of Williams Park.Wellington shipowner, J H Williams, bought land in Days Bay near the end of the 19th century to create custom for his smaller vessels, building a wharf and turning the bay into a sports and resort development for day-trippers and holiday-makers.