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Coldest sea in Australia and Oceania in September

1,649 coastal locations in Australia and Oceania ranked by typical September sea temperature, coldest first. Region-wide average in September: 21.6°C.

Coldest in September

Heard Island

1.5°C September mean in Australia

Regional September average

21.6°C

across all 1,649 coastal locations in Australia and Oceania

Vs annual mean

-1.8°C

below the year-round regional average

What the Australia and Oceania sea feels like in September

Water at this temperature is very pleasant to swim in. If you tend to wear a wetsuit when swimming, you might consider removing it now to avoid the body overheating.

Australia and Oceania monthly average 21.3°C to 25.5°C
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  • Warmest month February 25.5°C
  • Coldest month August 21.3°C
  • Annual mean 23.5°C
  • Months above 20°C 12 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 Australia and Oceania month rankings:

Australia and Oceania sea temperature map (live)

The map shows today's latest reading at every Australia and Oceania 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 Australia and Oceania 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 Heard Island Australian external territory 1.5°C
2 Macquarie Island Tasmania 4.6°C
3 Campbell Island/Motu Ihupuku - Perseverance Harbour New Zealand Outlying Islands 7.4°C
4 Auckland Island - Carnley Harbour Auckland 8.6°C
5 Dunedin 10.4°C
6 Portobello 10.4°C
7 Timaru 10.4°C
8 Sumner 10.5°C
9 Kaka Point 10.5°C
10 Akaroa 10.5°C
11 Christchurch 10.5°C
12 Lyttelton 10.5°C
13 French Bay Canterbury 10.7°C
14 Tikao Bay Canterbury 10.7°C
15 Green Island Otago 10.8°C
16 Port Chalmers Otago 10.9°C
17 Spit Wharf Otago 10.9°C
18 Oamaru Otago 10.9°C
19 Nugget Point Otago 11.0°C
20 Kaikoura 11.0°C
21 Snares Islands/Tini Heke - North East Island New Zealand Outlying Islands 11.1°C
22 Waipapa Point Southland 11.1°C
23 Invercargill 11.1°C
24 Waikawa Harbour Southland 11.2°C
25 Bluff Southland 11.2°C
Show 25 more ▸
26 Dog Island Southland 11.2°C
27 Ruapuke Island Southland 11.2°C
28 Riverton/Aparima Southland 11.2°C
29 Riverton 11.3°C
30 New River Entrance Southland 11.3°C
31 Oban Southland 11.4°C
32 Stewart Island 11.4°C
33 Port Adventure Southland 11.4°C
34 Kawakaputa Bay Southland 11.5°C
35 Pahia 11.5°C
36 Yankee River Southland 11.5°C
37 Owenga Chatham Islands Territory 11.7°C
38 Waitangi Chatham Islands Territory 11.7°C
39 Kaingaroa Chatham Islands Territory 11.8°C
40 Solander Island (Hautere) Southland 11.8°C
41 Easy Harbour Southland 11.9°C
42 Small Craft Retreat Southland 11.9°C
43 Port Craig Southland 11.9°C
44 Austins Ferry Tasmania 11.9°C
45 Bellerive Tasmania 11.9°C
46 Berriedale Tasmania 11.9°C
47 Blackmans Bay Tasmania 11.9°C
48 Bridgewater Tasmania 11.9°C
49 Glenorchy Tasmania 11.9°C
50 Goodwood Tasmania 11.9°C

Warmest 10 in Australia and Oceania in September

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

# Location September mean
1 Nukuoro 30.1°C
2 Kuttu 30.1°C
3 Lukunor 30.1°C
4 Oneop 30.1°C
5 Satawan 30.1°C
6 Ta 30.1°C
7 Moro Tu Chuuk 30.1°C
8 Satawan Anchorage, Nomoi Islands, Chuuk, FSM Chuuk 30.1°C
9 Namoluk Atoll, Chuuk, FSM Chuuk 30.1°C
10 Kolonia 30.1°C

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