Swimming in New Zealand in september 2025 Sea temperature by city in september
Do you want to go to the beach in New Zealand in september 2025? Is it the right month to go for pleasant temperatures and staying in the water for a long time? The answer is on this page with the sea temperatures in september in New Zealand by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in New Zealand in september 2025
Here, find the average sea temperature in New Zealand in september in several coastal cities.
North Island in september
60°F
min: 57°F / max: 61°F
56°F
min: 53°F / max: 58°F
60°F
min: 58°F / max: 62°F
Cape Reinga
60°F
min: 59°F / max: 62°F
Castlepoint
57°F
min: 55°F / max: 60°F
60°F
min: 58°F / max: 62°F
South Island in september
51°F
min: 49°F / max: 53°F
49°F
min: 47°F / max: 51°F
Abel Tasman National Park
56°F
min: 54°F / max: 58°F
51°F
min: 49°F / max: 53°F
The Catlins
52°F
min: 51°F / max: 54°F
Hokitika
55°F
min: 54°F / max: 57°F
Where should you go swimming in New Zealand in the month of september?
Swimming in New Zealand in september is cold (in the best case scenario)
In september in New Zealand swimming conditions vary by city. Details below:
Swimming in september in Auckland, Tauranga, Cape Reinga, Cathedral Cove, Coromandel, Omamari, Waiheke Island, Kaitaia, Kerikeri, Ruakaka, Thames, Waihi Beach, Whakatane and Whangamata is possible... with a wetsuit! Indeed, the water is cold at this time of year with an average temperature of 60°F (min: 57°F/max: 61°F).
Forget about swimming in Christchurch, Dunedin, Wellington, Abel Tasman National Park, Akaroa, Castlepoint, The Catlins, Hokitika, Invercargill, Māhia, Moeraki Boulders, Mokau, Napier, Nelson, Otago Peninsula, Porangahau, Ruatoria, Stewart Island, Waitārere Beach, Wharariki beach, Whatipu Beach, Balclutha, Blenheim, Gisborne, Greymouth, Hawera, Kaikoura, Levin, New Plymouth, Oamaru, Opunake, Paraparaumu, Picton, Porirua, Raglan, Takaka, Timaru, Wairoa, Waitara, Waiuku, Wanganui, Warkworth and Westport in september! The water temperature is freezing, reaching as low as 49°F (and only 53°F at the best of times). Our advice: plan on sightseeing, and don't bring your beach towel!
Where to go swimming in New Zealand in september: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in september
Auckland
| September | |||
| Average sea temperature | 60°F | ||
| Minimum sea temperature | 57°F | ||
| Maximum sea temperature | 61°F | ||
| Average outside temperature | 58°F | ||
| Maximum outside temperature | 59°F | ||
| Minimum outside temperature | 54°F | ||
| Precipitation | 5.7in | ||
| Number of days of precipitation | 8 jour(s) (27%) | ||
| Cloud cover | 49% | ||
| Our opinion | cold swimming |
More information on swimming in Auckland in september
Christchurch
| September | |||
| Average sea temperature | 51°F | ||
| Minimum sea temperature | 49°F | ||
| Maximum sea temperature | 53°F | ||
| Average outside temperature | 50°F | ||
| Maximum outside temperature | 58°F | ||
| Minimum outside temperature | 43°F | ||
| Precipitation | 1.6in | ||
| Number of days of precipitation | 2 jour(s) (8%) | ||
| Cloud cover | 37% | ||
| Our opinion | freezing swimming |
More information on swimming in Christchurch in september
Dunedin
| September | |||
| Average sea temperature | 49°F | ||
| Minimum sea temperature | 47°F | ||
| Maximum sea temperature | 51°F | ||
| Average outside temperature | 49°F | ||
| Maximum outside temperature | 52°F | ||
| Minimum outside temperature | 47°F | ||
| Precipitation | 1.7in | ||
| Number of days of precipitation | 3 jour(s) (8%) | ||
| Cloud cover | 43% | ||
| Our opinion | freezing swimming |
More information on swimming in Dunedin in september
Wellington
| September | |||
| Average sea temperature | 56°F | ||
| Minimum sea temperature | 53°F | ||
| Maximum sea temperature | 58°F | ||
| Average outside temperature | 54°F | ||
| Maximum outside temperature | 56°F | ||
| Minimum outside temperature | 52°F | ||
| Precipitation | 3in | ||
| Number of days of precipitation | 4 jour(s) (15%) | ||
| Cloud cover | 39% | ||
| Our opinion | freezing swimming |
More information on swimming in Wellington in september
Tauranga
| September | |||
| Average sea temperature | 60°F | ||
| Minimum sea temperature | 58°F | ||
| Maximum sea temperature | 62°F | ||
| Average outside temperature | 54°F | ||
| Maximum outside temperature | 58°F | ||
| Minimum outside temperature | 49°F | ||
| Precipitation | 6in | ||
| Number of days of precipitation | 8 jour(s) (26%) | ||
| Cloud cover | 46% | ||
| Our opinion | cold swimming |
More information on swimming in Tauranga in september
List of coastal cities in New Zealand
| Auckland in september | cold swimming |
| Christchurch in september | freezing swimming |
| Dunedin in september | freezing swimming |
| Wellington in september | freezing swimming |
| Tauranga in september | cold swimming |
| Abel Tasman National Park in september | freezing swimming |
| Akaroa in september | freezing swimming |
| Cape Reinga in september | cold swimming |
| Castlepoint in september | freezing swimming |
| Cathedral Cove in september | cold swimming |
| The Catlins in september | freezing swimming |
| Coromandel in september | cold swimming |
| Hokitika in september | freezing swimming |
| Invercargill in september | freezing swimming |
| Māhia in september | freezing swimming |
| Moeraki Boulders in september | freezing swimming |
| Mokau in september | freezing swimming |
| Napier in september | freezing swimming |
| Nelson in september | freezing swimming |
| Omamari in september | cold swimming |
| Otago Peninsula in september | freezing swimming |
| Porangahau in september | freezing swimming |
| Ruatoria in september | freezing swimming |
| Stewart Island in september | freezing swimming |
| Waiheke Island in september | cold swimming |
| Waitārere Beach in september | freezing swimming |
| Wharariki beach in september | freezing swimming |
| Whatipu Beach in september | freezing swimming |
| Balclutha in september | freezing swimming |
| Blenheim in september | freezing swimming |
| Gisborne in september | freezing swimming |
| Greymouth in september | freezing swimming |
| Hawera in september | freezing swimming |
| Kaikoura in september | freezing swimming |
| Kaitaia in september | cold swimming |
| Kerikeri in september | cold swimming |
| Levin in september | freezing swimming |
| New Plymouth in september | freezing swimming |
| Oamaru in september | freezing swimming |
| Opunake in september | freezing swimming |
| Paraparaumu in september | freezing swimming |
| Picton in september | freezing swimming |
| Porirua in september | freezing swimming |
| Raglan in september | freezing swimming |
| Ruakaka in september | cold swimming |
| Takaka in september | freezing swimming |
| Thames in september | cold swimming |
| Timaru in september | freezing swimming |
| Waihi Beach in september | cold swimming |
| Wairoa in september | freezing swimming |
| Waitara in september | freezing swimming |
| Waiuku in september | freezing swimming |
| Wanganui in september | freezing swimming |
| Warkworth in september | freezing swimming |
| Westport in september | freezing swimming |
| Whakatane in september | cold swimming |
| Whangamata in september | cold swimming |