Skip to content
seatemperatures.net

Coldest sea in New Zealand in September

245 coastal locations in New Zealand ranked by typical September sea temperature, coldest first. Region-wide average in September: 13.7°C.

Coldest in September

Campbell Island/Motu Ihupuku - Perseverance Harbour

7.4°C September mean in New Zealand

Regional September average

13.7°C

across all 245 coastal locations in New Zealand

Vs annual mean

-2.6°C

below the year-round regional average

What the New Zealand sea feels like in September

Water at this temperature is cold and will feel very cold initially, but the body will get used to it and longer swims are possible. Experienced swimmers can manage several hours of swimming, however hypothermia is still a real risk.

New Zealand monthly average 13.6°C to 19.3°C
J
F
M
A
M
J
J
A
S
O
N
D
  • Warmest month February 19.3°C
  • Coldest month August 13.6°C
  • Annual mean 16.3°C
  • Months above 20°C 0 of 12

Where September fits in the year

September sits inside the regional pattern shown on the left. Pick a different month to see how the ranking shifts.

All twelve New Zealand month rankings:

New Zealand sea temperature map (live)

The map shows today's latest reading at every New Zealand location. The list below is based on the typical September mean.

Zoom in to see individual locations. Click a pin for water temperatures. View list →
°C -2 0 1 3 5 7 9 11 13 15 17 19 21 24 27 30 35

Top 50 coldest New Zealand locations in September

Sorted by typical September mean from a decade of daily readings, coldest first. Click any place for the full location page.

# Location September mean
1 Campbell Island/Motu Ihupuku - Perseverance Harbour New Zealand Outlying Islands 7.4°C
2 Auckland Island - Carnley Harbour Auckland 8.6°C
3 Dunedin 10.4°C
4 Portobello 10.4°C
5 Timaru 10.4°C
6 Sumner 10.5°C
7 Kaka Point 10.5°C
8 Akaroa 10.5°C
9 Christchurch 10.5°C
10 Lyttelton 10.5°C
11 French Bay Canterbury 10.7°C
12 Tikao Bay Canterbury 10.7°C
13 Green Island Otago 10.8°C
14 Port Chalmers Otago 10.9°C
15 Spit Wharf Otago 10.9°C
16 Oamaru Otago 10.9°C
17 Nugget Point Otago 11.0°C
18 Kaikoura 11.0°C
19 Snares Islands/Tini Heke - North East Island New Zealand Outlying Islands 11.1°C
20 Waipapa Point Southland 11.1°C
21 Invercargill 11.1°C
22 Waikawa Harbour Southland 11.2°C
23 Bluff Southland 11.2°C
24 Dog Island Southland 11.2°C
25 Ruapuke Island Southland 11.2°C
Show 25 more ▸
26 Riverton/Aparima Southland 11.2°C
27 Riverton 11.3°C
28 New River Entrance Southland 11.3°C
29 Oban Southland 11.4°C
30 Stewart Island 11.4°C
31 Port Adventure Southland 11.4°C
32 Kawakaputa Bay Southland 11.5°C
33 Pahia 11.5°C
34 Yankee River Southland 11.5°C
35 Owenga Chatham Islands Territory 11.7°C
36 Waitangi Chatham Islands Territory 11.7°C
37 Kaingaroa Chatham Islands Territory 11.8°C
38 Solander Island (Hautere) Southland 11.8°C
39 Easy Harbour Southland 11.9°C
40 Small Craft Retreat Southland 11.9°C
41 Port Craig Southland 11.9°C
42 Ernest Islands Southland 11.9°C
43 Cape Campbell Marlborough 12.1°C
44 Chalky Island - Sealers Bay Southland 12.1°C
45 Coal Island - Fishing Bay Southland 12.1°C
46 Jane Coves Southland 12.1°C
47 Welcombe Bay Southland 12.1°C
48 Port Arthur 12.4°C
49 Front Islands Southland 12.5°C
50 Gilbert Islands Southland 12.5°C

Warmest 10 in New Zealand in September

Same data the other way. The warmest spots for the same month.

# Location September mean
1 Fishing Rock Sugar Loaf Islands 19.2°C
2 Coopers Beach 16.4°C
3 Bay of Islands 16.4°C
4 Waiiti Bay Northland 16.3°C
5 Kerikeri 16.3°C
6 Whangamumu Harbour Northland 16.3°C
7 North Cape (Otou) Northland 16.2°C
8 Paihia 16.2°C
9 Russell 16.2°C
10 Waitangi (Northland) 16.2°C

More on this region