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Coldest sea in Australia in September

954 coastal locations in Australia ranked by typical September sea temperature, coldest first. Region-wide average in September: 20.6°C.

Coldest in September

Heard Island

1.5°C September mean in Australia

Regional September average

20.6°C

across all 954 coastal locations in Australia

Vs annual mean

-2.3°C

below the year-round regional average

What the Australia 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 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 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 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 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 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 Austins Ferry Tasmania 11.9°C
4 Bellerive Tasmania 11.9°C
5 Berriedale Tasmania 11.9°C
6 Blackmans Bay Tasmania 11.9°C
7 Bridgewater Tasmania 11.9°C
8 Glenorchy Tasmania 11.9°C
9 Goodwood Tasmania 11.9°C
10 Hobart Tasmania 11.9°C
11 Howrah Tasmania 11.9°C
12 Kingston Tasmania 11.9°C
13 Lauderdale Tasmania 11.9°C
14 Lindisfarne Tasmania 11.9°C
15 Lutana Tasmania 11.9°C
16 Old Beach Tasmania 11.9°C
17 Rokeby Tasmania 11.9°C
18 Sandy Bay Tasmania 11.9°C
19 Seven Mile Beach Tasmania 11.9°C
20 Taroona Tasmania 11.9°C
21 Granton Tasmania 12.2°C
22 Kettering Tasmania 12.2°C
23 Margate Tasmania 12.2°C
24 Stanley Tasmania 12.2°C
25 Swansea Tasmania 12.3°C
Show 25 more ▸
26 Big River Cove Tasmania 12.3°C
27 Burnie Tasmania 12.3°C
28 Swan Island Tasmania 12.3°C
29 Balnarring Victoria 12.3°C
30 Black Rock Victoria 12.3°C
31 Bruny Island Tasmania 12.3°C
32 Cowes Victoria 12.3°C
33 Flinders Victoria 12.3°C
34 Hampton Victoria 12.3°C
35 Mordialloc Victoria 12.3°C
36 Mount Martha Victoria 12.3°C
37 Parkdale Victoria 12.3°C
38 Phillip Island Victoria 12.3°C
39 Point Leo Victoria 12.3°C
40 Western Port Bay Victoria 12.3°C
41 Wynyard Tasmania 12.3°C
42 Smithton Tasmania 12.3°C
43 Bramble Cove Tasmania 12.3°C
44 Bridport Tasmania 12.3°C
45 Port Phillip Bay Victoria 12.4°C
46 Alverston Tasmania 12.4°C
47 Penguin Tasmania 12.4°C
48 Devonport Tasmania 12.4°C
49 Launceston Tasmania 12.4°C
50 Flinders Island Tasmania 12.4°C

Warmest 10 in Australia in September

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

# Location September mean
1 Burge Point Northern Territory 28.5°C
2 Native Point Northern Territory 28.5°C
3 Newby Shoal Northern Territory 28.4°C
4 Tapa Bay Northern Territory 28.3°C
5 Point Jenny Northern Territory 28.3°C
6 Fish Reef Northern Territory 28.3°C
7 Jabiru Northern Territory 28.3°C
8 Darwin Northern Territory 28.3°C
9 Fannie Bay Northern Territory 28.3°C
10 Larrakeyah Northern Territory 28.3°C

More on this region