Saitama Prefecture Tokyo Metropolis Niiza has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall.

[4] The town of Owada was created within Niikura District, Saitama with the establishment of the modern municipalities system on April 1, 1889.

On March 1, 1955, Owada annexed the neighboring village of Katayama becoming Niiza Town, which was raised to city status on November 1, 1970.

Toppan printing has a large factory in Niiza, which is also home to a number of other light manufacturing, electronics and transportation/warehousing companies.

However, due to its proximity to Tokyo, over a third of the workforce commutes daily, making Niiza largely a bedroom community.