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Coldest sea in Papua New Guinea

71 coastal locations in Papua New Guinea ranked by year-round average sea temperature, coldest first. The regional average is 29.3°C. The top of the list is where the water stays cold all year. The contrast list at the bottom shows the warmest coasts for context.

Coldest location

Samarai

Year-round average 27.9°C in Papua New Guinea

Regional average

29.3°C

across all 71 Papua New Guinea coastal locations

Coldest month

August

28.1°C region-wide average

Papua New Guinea monthly average 28.1°C to 30.0°C
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  • Warmest month January 30.0°C
  • Coldest month August 28.1°C
  • Annual mean 29.2°C
  • Months above 20°C 12 of 12

Month by month across Papua New Guinea

Sea temperatures in Papua New Guinea swing from 28.1°C in August to 30.0°C in January on average across every coast we track. That spread of 2°C hides much bigger swings at individual locations.

Want a specific month? Pick one for a dedicated ranking:

Papua New Guinea sea temperature map

Today's pin colours show the latest daily reading at every Papua New Guinea location we track. Cool blues cluster around the high-latitude coasts.

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 locations in Papua New Guinea

Coastal locations across Papua New Guinea sorted by year-round average, coldest first. Honest cold-water swimming country. Click any place for its 30-day chart, monthly profile, and 10-year history.

# Location Annual mean
1 Samarai 27.9°C
2 Bonarua (Brumer) Island Milne Bay Province 28.0°C
3 Kaligola Point Central Province 28.0°C
4 Dedele Point Central Province 28.1°C
5 Delami Island Milne Bay Province 28.1°C
6 Port Moresby 28.1°C
7 Baiiri Island Milne Bay Province 28.1°C
8 Margarida Central Province 28.1°C
9 Duchateau Islands Milne Bay Province 28.3°C
10 Daru 28.3°C
11 Kanawea Island Milne Bay Province 28.4°C
12 Mutacomal Reef Western Province 28.4°C
13 Bobo Island Milne Bay Province 28.4°C
14 Merrie England Shoals Western Province 28.4°C
15 Hati Lawi Harbour Milne Bay Province 28.6°C
16 Umuda Island Western Province 28.6°C
17 Goaribari Island Gulf Province 28.7°C
18 Kegawam Island Milne Bay Province 28.7°C
19 Kumul Tanker Mooring New Ireland Province 28.7°C
20 Uramu Island Gulf Province 28.8°C
21 Kerema 28.8°C
22 Port Romilly Gulf Province 28.8°C
23 Cape Deliverance Milne Bay Province 28.9°C
24 Milne Bay 28.9°C
25 Boia Boia Waga Milne Bay Province 28.9°C
Show 25 more ▸
26 East Cape Milne Bay Province 28.9°C
27 Misima Milne Bay Province 29.0°C
28 Aigura Point Milne Bay Province 29.1°C
29 Alotau (Milne Bay) Milne Bay Province 29.1°C
30 Mapamoiwa Milne Bay Province 29.2°C
31 Sharp Island Milne Bay Province 29.2°C
32 Finschhafen 29.3°C
33 Bulavai Point Milne Bay Province 29.3°C
34 Kandrian 29.4°C
35 Madang 29.4°C
36 Tufi Harbour Northern Province 29.4°C
37 Dregerhafen Morobe Province 29.5°C
38 Wasu Morobe Province 29.5°C
39 Saidor Madang Province 29.5°C
40 Madang (Nagada Harbour) Madang Province 29.5°C
41 Wewak 29.5°C
42 Caution Point Northern Province 29.6°C
43 Bogia Madang Province 29.6°C
44 Eve Shoal Northern Province 29.6°C
45 Oro Bay Northern Province 29.6°C
46 Sepik River East Sepik Province 29.6°C
47 Umboi Island Morobe Province 29.6°C
48 Aitape 29.6°C
49 Lae Morobe Province 29.6°C
50 Vanimo 29.7°C

Warmest 10 in Papua New Guinea for contrast

Same data flipped. Useful if you want to know which Papua New Guinea coasts stay warmest year-round before you commit to a cold-water swim trip.

# Location Annual mean
1 Kimbe Bay West New Britain Province 30.2°C
2 Talasea West New Britain Province 30.2°C
3 Tavanatangir Harbour East New Britain Province 30.1°C
4 Eleonora Bay West New Britain Province 30.1°C
5 Kimbe 30.1°C
6 Soroken Bougainville 30.0°C
7 Ambitle Island New Ireland Province 30.0°C
8 Anewa Bay Bougainville 30.0°C
9 Carteret Islands 30.0°C
10 Torokina Bougainville 30.0°C

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