Coldest sea in South Korea in October

62 coastal locations in South Korea ranked by typical October sea temperature, coldest first. Region-wide average in October: 21.3°C.

Coldest in October

Baengnyeongdo

18.6°C October mean in South Korea

Regional October average

21.3°C

across all 62 coastal locations in South Korea

Vs annual mean

+4.2°C

above the year-round regional average

What the South Korea sea feels like in October

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.

South Korea monthly average 9.9°C to 26.2°C

Warmest month August 26.2°C
Coldest month February 9.9°C
Annual mean 17.1°C
Months above 20°C 4 of 12

Where October fits in the year

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

All twelve South Korea month rankings:

South Korea sea temperature map (live)

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

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

#	Location	Country	October mean
1	Baengnyeongdo Incheon	South Korea	18.6°C
2	Daecheongdo Incheon	South Korea	18.6°C
3	Daeyeonpyeongdo Incheon	South Korea	19.1°C
4	Sokcho	South Korea	19.7°C
5	Eocheongdo Jeollabuk-do	South Korea	19.8°C
6	Moppo	South Korea	19.8°C
7	Sinan	South Korea	19.8°C
8	Anheung Chungcheongnam-do	South Korea	19.8°C
9	Boryeong	South Korea	19.8°C
10	Kunsan	South Korea	19.8°C
11	Mohang-ri Chungcheongnam-do	South Korea	20.0°C
12	Gangneung	South Korea	20.1°C
13	Wido Jeollabuk-do	South Korea	20.2°C
14	Yongpyong	South Korea	20.2°C
15	Daeheuksando Jeollanam-do	South Korea	20.3°C
16	Jumunjin Gangwon-do	South Korea	20.5°C
17	Taesal Li	South Korea	20.5°C
18	Hataedo Jeollanam-do	South Korea	20.6°C
19	Ansan	South Korea	20.6°C
20	Goyang	South Korea	20.6°C
21	Seoul	South Korea	20.6°C
22	Tonghae	South Korea	20.7°C
23	Byeokpajin Jeollanam-do	South Korea	20.7°C
24	Eoranjin Jeollanam-do	South Korea	20.7°C
25	Modo Jeollanam-do	South Korea	20.7°C

Show 25 more ▸

26	Sangmado Jeollanam-do	South Korea	20.7°C
27	Hwaseong	South Korea	20.8°C
28	Incheon	South Korea	20.8°C
29	Mukho Gangwon-do	South Korea	21.0°C
30	Geumdangdo Jeollanam-do	South Korea	21.3°C
31	Jukbyeon Gyeongsangbuk-do	South Korea	21.3°C
32	Hoko	South Korea	21.4°C
33	Pohang	South Korea	21.4°C
34	Narodo Jeollanam-do	South Korea	21.5°C
35	Sunchun	South Korea	21.5°C
36	Soando Jeollanam-do	South Korea	21.6°C
37	Ganggu Gyeongsangnam-do	South Korea	21.6°C
38	Ulleungdo Gyeongsangbuk-do	South Korea	21.6°C
39	Cheongsando Jeollanam-do	South Korea	21.6°C
40	Wando Jeollanam-do	South Korea	21.6°C
41	Reisui	South Korea	21.9°C
42	Gwanyang Jeollanam-do	South Korea	21.9°C
43	Yeosu Jeollanam-do	South Korea	21.9°C
44	Geomundo Jeollanam-do	South Korea	22.0°C
45	Yokjido Gyeongsangnam-do	South Korea	22.3°C
46	Geoje	South Korea	22.3°C
47	Kyosai	South Korea	22.3°C
48	Chujado Jeju-do	South Korea	22.3°C
49	Chinhae	South Korea	22.5°C
50	Masan	South Korea	22.5°C

Warmest 10 in South Korea in October

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

#	Location	Country	October mean
1	Seogwipo Jeju-do	South Korea	25.1°C
2	Hwasun Jeju-do	South Korea	24.8°C
3	Jukdo Jeju-do	South Korea	23.8°C
4	Udo Sudo Jeju-do	South Korea	23.6°C
5	Sinhyeon	South Korea	22.9°C
6	Ulsan	South Korea	22.9°C
7	Busan	South Korea	22.9°C
8	Gampo Gyeongsangbuk-do	South Korea	22.8°C
9	Gadeokdo Busan	South Korea	22.7°C
10	Jeju	South Korea	22.7°C