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Coldest sea in Australia in December

954 coastal locations in Australia ranked by typical December sea temperature, coldest first. Region-wide average in December: 24.4°C.

Coldest in December

Heard Island

2.7°C December mean in Australia

Regional December average

24.4°C

across all 954 coastal locations in Australia

Vs annual mean

+1.5°C

above the year-round regional average

What the Australia sea feels like in December

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 monthly average 20.0°C to 25.5°C
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  • Warmest month February 25.5°C
  • Coldest month August 20.0°C
  • Annual mean 22.9°C
  • Months above 20°C 12 of 12

Where December fits in the year

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

All twelve Australia month rankings:

Australia sea temperature map (live)

The map shows today's latest reading at every Australia location. The list below is based on the typical December 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 locations in December

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

# Location December mean
1 Heard Island Australian external territory 2.7°C
2 Macquarie Island Tasmania 6.0°C
3 Recherche Bay Tasmania 14.1°C
4 Southport Jetty Tasmania 14.1°C
5 Bramble Cove Tasmania 14.2°C
6 Maatsuyker Island Tasmania 14.2°C
7 Bruny Island Tasmania 14.6°C
8 Granton Tasmania 14.7°C
9 Kettering Tasmania 14.7°C
10 Margate Tasmania 14.7°C
11 Austins Ferry Tasmania 14.9°C
12 Bellerive Tasmania 14.9°C
13 Berriedale Tasmania 14.9°C
14 Blackmans Bay Tasmania 14.9°C
15 Bridgewater Tasmania 14.9°C
16 Glenorchy Tasmania 14.9°C
17 Goodwood Tasmania 14.9°C
18 Hobart Tasmania 14.9°C
19 Howrah Tasmania 14.9°C
20 Kingston Tasmania 14.9°C
21 Lauderdale Tasmania 14.9°C
22 Lindisfarne Tasmania 14.9°C
23 Lutana Tasmania 14.9°C
24 Old Beach Tasmania 14.9°C
25 Rokeby Tasmania 14.9°C
Show 25 more ▸
26 Sandy Bay Tasmania 14.9°C
27 Seven Mile Beach Tasmania 14.9°C
28 Taroona Tasmania 14.9°C
29 Impression Bay Tasmania 15.2°C
30 Parsons Bay Tasmania 15.2°C
31 Pirates Bay Tasmania 15.2°C
32 Cape Sorell (Off) Tasmania 15.2°C
33 King Island (Grassy) Tasmania 15.3°C
34 Granville Harbour Tasmania 15.3°C
35 Pieman River Tasmania 15.3°C
36 Seal Bay Tasmania 15.4°C
37 Three Hummock Island Tasmania 15.5°C
38 Stack Island Tasmania 15.6°C
39 Darlington Jetty Tasmania 15.8°C
40 Spring Bay Tasmania 15.8°C
41 Bass Pyramid Tasmania 15.9°C
42 Bell Bay Tasmania 15.9°C
43 Low Head Tasmania 15.9°C
44 Smithton Tasmania 16.0°C
45 Swansea Tasmania 16.0°C
46 Garden Cove Tasmania 16.0°C
47 Wynyard Tasmania 16.0°C
48 Burnie Tasmania 16.1°C
49 Alverston Tasmania 16.1°C
50 Penguin Tasmania 16.1°C

Warmest 10 in Australia in December

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

# Location December mean
1 Gulf of Carpentaria Northern Territory 31.5°C
2 Cape Domett Western Australia 31.5°C
3 Quoin Island Northern Territory 31.5°C
4 West Island Northern Territory 31.5°C
5 Adolphus Island Western Australia 31.4°C
6 Shale Island Western Australia 31.4°C
7 Pelican Island Western Australia 31.4°C
8 Lacrosse Island Western Australia 31.3°C
9 Catfish Island Northern Territory 31.3°C
10 Anson Bay Northern Territory 31.3°C

More on this region