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Coldest sea in South Korea

62 coastal locations in South Korea ranked by year-round average sea temperature, coldest first. The regional average is 17.1°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

Taesal Li

Year-round average 13.9°C in South Korea

Regional average

17.1°C

across all 62 South Korea coastal locations

Coldest month

February

9.9°C region-wide average

South Korea monthly average 9.9°C to 26.2°C
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  • Warmest month August 26.2°C
  • Coldest month February 9.9°C
  • Annual mean 17.1°C
  • Months above 20°C 4 of 12

Month by month across South Korea

Sea temperatures in South Korea swing from 9.9°C in February to 26.2°C in August on average across every coast we track. That spread of 16°C hides much bigger swings at individual locations.

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

South Korea sea temperature map

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

Coastal locations across South Korea 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 Taesal Li 13.9°C
2 Daeyeonpyeongdo Incheon 14.0°C
3 Baengnyeongdo Incheon 14.0°C
4 Daecheongdo Incheon 14.0°C
5 Ansan 14.1°C
6 Goyang 14.1°C
7 Seoul 14.1°C
8 Hwaseong 14.1°C
9 Incheon 14.1°C
10 Mohang-ri Chungcheongnam-do 14.2°C
11 Anheung Chungcheongnam-do 14.7°C
12 Moppo 15.1°C
13 Sinan 15.1°C
14 Eocheongdo Jeollabuk-do 15.5°C
15 Boryeong 15.5°C
16 Kunsan 15.5°C
17 Wido Jeollabuk-do 15.8°C
18 Daeheuksando Jeollanam-do 16.0°C
19 Hataedo Jeollanam-do 16.1°C
20 Byeokpajin Jeollanam-do 16.2°C
21 Eoranjin Jeollanam-do 16.2°C
22 Modo Jeollanam-do 16.2°C
23 Sangmado Jeollanam-do 16.2°C
24 Sokcho 16.5°C
25 Gangneung 16.9°C
Show 25 more ▸
26 Yongpyong 16.9°C
27 Jumunjin Gangwon-do 17.1°C
28 Sunchun 17.1°C
29 Geumdangdo Jeollanam-do 17.1°C
30 Tonghae 17.2°C
31 Narodo Jeollanam-do 17.3°C
32 Mukho Gangwon-do 17.4°C
33 Gwanyang Jeollanam-do 17.5°C
34 Yeosu Jeollanam-do 17.5°C
35 Jukbyeon Gyeongsangbuk-do 17.8°C
36 Soando Jeollanam-do 17.9°C
37 Reisui 17.9°C
38 Hoko 18.0°C
39 Pohang 18.0°C
40 Cheongsando Jeollanam-do 18.0°C
41 Wando Jeollanam-do 18.0°C
42 Ulleungdo Gyeongsangbuk-do 18.0°C
43 Ganggu Gyeongsangnam-do 18.0°C
44 Geomundo Jeollanam-do 18.2°C
45 Yokjido Gyeongsangnam-do 18.3°C
46 Chujado Jeju-do 18.6°C
47 Geoje 18.8°C
48 Jisepo Gyeongsangnam-do 18.8°C
49 Kyosai 18.8°C
50 Gampo Gyeongsangbuk-do 19.0°C

Warmest 10 in South Korea for contrast

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

# Location Annual mean
1 Seogwipo Jeju-do 21.4°C
2 Hwasun Jeju-do 21.1°C
3 Jukdo Jeju-do 20.3°C
4 Udo Sudo Jeju-do 20.3°C
5 Busan 19.5°C
6 Sinhyeon 19.4°C
7 Ulsan 19.4°C
8 Jeju 19.4°C
9 Jejudo 19.4°C
10 Gadeokdo Busan 19.1°C

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