Mowhanau is a small coastal settlement on the Tasman Sea coast, roughly 14 kilometres west of Whanganui. It sits at Kai Iwi Beach and is sometimes referred to interchangeably with the beach itself — the Whanganui District Council uses the name Kai Iwi Beach (Mowhanau) for the area. A mix of permanent residences and holiday homes, the settlement has a population of around 1,400 and is popular with Whanganui families seeking a coastal base close to the city.
Practical Information
| Location | Sunset Parade and surrounding streets, Kai Iwi Beach, approx 14km west of Whanganui |
| Population | Approximately 1,407 (2023 census) |
| Beach access | Direct access to Kai Iwi Beach (black sand, Tasman Sea) |
| Facilities nearby | Toilets, BBQs, playground, holiday park at Kai Iwi Beach |
| Cliffside lookout | Permanently closed due to coastal erosion — do not approach cliffs |
| Access road | Rapanui Road off State Highway 3 |
About Mowhanau
Mowhanau is the residential and holiday community that sits directly at Kai Iwi Beach. The 2023 New Zealand census recorded a population of 1,407 — a figure that includes the broader Kai Iwi Beach area. The settlement is centred on Sunset Parade and the surrounding streets, where a mix of permanent homes and holiday houses line the coast.
The beach itself — black sand backed by striking clay cliffs — is the main draw. Coastal erosion has shaped both the landscape and local planning priorities here. The Whanganui coast retreats at roughly 30–50 metres per century, and the cliffside lookout on Sunset Parade has been permanently closed following assessment of its erosion risk. The Whanganui District Council has an active coastal action plan for the Kai Iwi Beach (Mowhanau) area, with $50,000 budgeted in the 2026–27 financial year for further planning work.
Despite these challenges, Mowhanau remains a popular place to live and visit. The community is small enough to have a genuine neighbourhood feel, and the beach provides easy access for walking, fishing and — subject to water quality — swimming. A holiday park adjacent to the beach area offers camping and accommodation for visitors.
Erosion and Coastal Planning
Coastal erosion is the most significant issue facing Mowhanau. The cliffs backing the beach are constantly retreating, and the former lookout on Sunset Parade — once a popular viewpoint — has been permanently closed to public access. Visitors should stay well back from the cliff edges at all times. The council’s ongoing coastal action plan is assessing long-term options for the Mowhanau shoreline.
What Visitors Say
“Love coming out here in summer — the black sand beach is unique and the community feels very relaxed and friendly.”
“The kids love the playground at the beach. It’s a great day out from Whanganui — not far but feels like a proper escape.”
Where to Learn More
Whanganui District Council — Coastal Action Plan: Kai Iwi Beach (Mowhanau) covers the council’s erosion management and coastal planning for the area.
Kai Iwi — Wikipedia provides background on the wider Kai Iwi community and its geography.
Kai Iwi Beach Holiday Park has accommodation and camping details for stays at the beach.
Frequently Asked Questions
Where is Mowhanau?
Mowhanau is the coastal settlement at Kai Iwi Beach, approximately 14 kilometres west of Whanganui via Rapanui Road off State Highway 3.
What is the difference between Mowhanau and Kai Iwi?
Kai Iwi is the broader rural community, while Mowhanau specifically refers to the beach settlement and population centre. The council uses the combined name “Kai Iwi Beach (Mowhanau)” for the area.
Why is the Mowhanau lookout closed?
The cliffside lookout on Sunset Parade has been permanently closed because the cliffs are actively eroding and the area is no longer considered safe for public use.
How many people live in Mowhanau?
The 2023 census recorded approximately 1,407 people in the Mowhanau/Kai Iwi Beach area — a mix of permanent residents and holiday home owners.
Is Mowhanau safe for swimming?
The beach is patrolled in summer, but water quality varies. Check the Whanganui District Council’s beaches page for current water quality status before swimming.
Is there accommodation at Mowhanau?
Yes — Kai Iwi Beach Holiday Park offers camping and holiday unit accommodation at the beach.
Mowhanau is part of the wider Whanganui suburbs guide. The Kai Iwi community page covers the broader rural area and Bushy Park Tarapuruhi bird sanctuary. Castlecliff is Whanganui’s other coastal suburb on the Tasman Sea.