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Coldest sea in South America

947 coastal locations in South America ranked by year-round average sea temperature, coldest first. The regional average is 20.4°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

Weddell Sea

Year-round average -1.8°C in Argentina

Regional average

20.4°C

across all 947 South America coastal locations

Coldest month

August

18.1°C region-wide average

South America monthly average 18.1°C to 22.7°C
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  • Warmest month February 22.7°C
  • Coldest month August 18.1°C
  • Annual mean 20.4°C
  • Months above 20°C 7 of 12

Month by month across South America

Sea temperatures in South America swing from 18.1°C in August to 22.7°C in February on average across every coast we track. That spread of 5°C hides much bigger swings at individual locations.

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

South America sea temperature map

Today's pin colours show the latest daily reading at every South America 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 South America

Coastal locations across South America 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 Weddell Sea Argentine Antarctica -1.8°C
2 Ronne Ice Shelf Argentine Antarctica -1.8°C
3 Signy Island Argentine Antarctica -0.7°C
4 Scotia Bay Argentine Antarctica -0.7°C
5 Diego Ramirez Magallanes Region 6.9°C
6 Port Stanley-A East Falkland 6.9°C
7 Puerto Vancouver Tierra del Fuego Province 7.0°C
8 Caleta Brent Tierra del Fuego Province 7.1°C
9 Caleta la Mision Tierra del Fuego 7.1°C
10 Puerto San Juan del Salvamento Tierra del Fuego 7.2°C
11 Bahia Crossley Tierra del Fuego 7.2°C
12 Bahía San Sebastián Tierra del Fuego 7.2°C
13 Isla Observatorio Tierra del Fuego Province 7.2°C
14 Rio Grande 7.2°C
15 Isla de los Estados 7.3°C
16 Tierra del Fuego 7.3°C
17 Bahia Buen Suceso Tierra del Fuego 7.4°C
18 Punta Catalina Magallanes y la Antártica Chilena 7.4°C
19 Cape Horn 7.5°C
20 Bleaker Island East Falkland 7.5°C
21 Cabo Virgenes Santa Cruz 7.5°C
22 Cabo Posesion Magallanes y la Antártica Chilena 7.5°C
23 Magellan Strait East Entrance Magallanes Region 7.5°C
24 Punta Dungeness Magallanes y la Antártica Chilena 7.5°C
25 Adventure Sound East Falkland 7.5°C
Show 25 more ▸
26 Bahia Aguirre Tierra del Fuego 7.5°C
27 Ushuaia 7.5°C
28 Fanny Cove Creek East Falkland 7.5°C
29 North Arm East Falkland 7.5°C
30 Bahia Thetis Tierra del Fuego Province 7.5°C
31 Puerto Williams 7.6°C
32 Punta Delgada Magallanes y la Antártica Chilena 7.6°C
33 Fitzroy Creek East Falkland 7.6°C
34 Stanley 7.6°C
35 Punta Arenas 7.6°C
36 Strait of Magellan 7.6°C
37 Berkeley Sound Lafonia 7.6°C
38 Port Stanley-B East Falkland 7.6°C
39 Lively Settlement East Falkland 7.7°C
40 Mare Harbour East Falkland 7.7°C
41 Caleta San Martin Magallanes and Chilean Antarctica 7.7°C
42 Puerto Toro 7.7°C
43 Fox Bay West Falkland 7.7°C
44 Port Salvador Entrance East Falkland 7.7°C
45 Port Stephens West Falkland 7.7°C
46 Albemarle West Falkland 7.7°C
47 Tierra del Fuego 7.8°C
48 Rio Gallegos 7.8°C
49 New Island North West Islands 7.8°C
50 Ajax Bay East Falkland 7.8°C

Coldest countries in South America

Country-level averages across every coastal location in each country (minimum 5 locations to be listed), coldest first.

# Country Annual mean
1 Falkland Islands 7.7°C
2 Chile 13.8°C
3 Argentina 14.1°C
4 Uruguay 18.3°C
5 Peru 19.5°C
6 Galapagos Islands 24.7°C
7 Brazil 24.9°C
8 Ecuador 25.6°C
9 Venezuela 27.3°C
10 Surinam 27.9°C
11 French Guiana 28.0°C
12 Colombia 28.2°C
13 Guyana 28.4°C

Warmest 10 in South America for contrast

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

# Location Annual mean
1 Covenas 29.8°C
2 Tolu 29.6°C
3 Ilha Do Brigue State of Amapá 29.3°C
4 Tintipan Island 29.3°C
5 Macapa Amapa 29.3°C
6 Santana Amapa 29.3°C
7 Barcarena Para 29.2°C
8 Cameta Para 29.2°C
9 Limoeiro do Ajuru Para 29.2°C
10 Oeiras do Para Para 29.2°C

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