Wellington stands at the south-western tip of the North Island on Cook Strait, the passage that separates the North and South Islands. On a clear day the snowcapped Kaikoura Ranges are visible to the south across the strait. To the north stretch the golden beaches of the Kapiti Coast. On the east the Rimutaka Range divides Wellington from the broad plains of the Wairarapa, a wine region of national acclaim.

Wellington is the southernmost national capital city in the world, with a latitude about 41°S. It is more densely populated than most other settlements in New Zealand, due to the small amount of building space available between the harbour and the surrounding hills. Because of its location in the roaring forties latitudes and its exposure to omnipresent winds coming through Cook Strait, the city is known to Kiwis as "Windy Wellington".

More than most cities, life in Wellington is dominated by its central business district (CBD). Approximately 62,000 people work in the CBD, only 4,000 fewer than work in Auckland's CBD, despite that city having three times Wellington's population. Wellington's cultural and nightlife venues concentrate in Courtenay Place and surroundings located in the southern part of the CBD, making the inner city suburb of Te Aro the largest entertainment destination in New Zealand.

Wellington has the highest average income of a main urban area in New Zealand and the highest percentage of people with tertiary qualifications.

Wellington has a reputation for its picturesque natural harbour and green hillsides adorned with tiered suburbs of colonial villas. The CBD is sited close to Lambton Harbour, an arm of Wellington Harbour. Wellington Harbour lies along an active geological fault, which is clearly evident on its straight western coast.

The land to the west of this rises abruptly, meaning that many of Wellington's suburbs sit high above the centre of the city.

There is a network of bush walks and reserves maintained by the Wellington City Council and local volunteers. The Wellington region has 500 square kilometres of regional parks and forests.

On the hill west of the city centre are Victoria University and Wellington Botanic Garden. Both can be reached on a funicular railway, the Wellington Cable Car.
Wellington Harbour has three islands: Matiu/Somes Island, Makaro/Ward Island and Mokopuna. Only Matiu/Somes Island is large enough for settlement. It has been used as a quarantine station for people and animals and as an internment camp during the First and Second World Wars. It is now a conservation island, providing refuge for endangered species, much like Kapiti Island further up the coast. There is access during daylight hours by the Dominion Post Ferry.

The city averages 2025 hours of sunshine per annum.

Temperature:
Mean daily maximum in summer (January) 20°C 69°F.
Mean daily minimum in summer 13°C 56°F.
Mean daily maximum in winter (July) 11°C 52°F.
Mean daily minimum in winter 6°C 43°F.
Annual rainfall mean 1249mm.