Warmest sea in South Korea in April

62 coastal locations in South Korea ranked by their typical April sea temperature. Region-wide average in April: 12.7°C. The top of the list is where to find the warmest swimming this month.

Warmest in April

Seogwipo

17.4°C April mean in South Korea

Regional April average

12.7°C

across all 62 coastal locations in South Korea

Vs annual mean

-4.4°C

below the year-round regional average

What the South Korea sea feels like in April

Water at this temperature is cold and will feel very cold initially, but the body will get used to it and longer swims are possible. Experienced swimmers can manage several hours of swimming, however hypothermia is still a real risk.

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 April fits in the year

April 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 April mean, useful for trip planning weeks or months ahead.

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 warmest South Korea locations in April

Sorted by the typical April mean built from a decade of daily readings at each location. Click any place for its 30-day chart, monthly profile, and full 10-year history.

#	Location	Country	April mean
1	Seogwipo Jeju-do	South Korea	17.4°C
2	Hwasun Jeju-do	South Korea	17.0°C
3	Udo Sudo Jeju-do	South Korea	16.0°C
4	Jukdo Jeju-do	South Korea	15.6°C
5	Sinhyeon	South Korea	15.5°C
6	Ulsan	South Korea	15.5°C
7	Busan	South Korea	15.5°C
8	Gampo Gyeongsangbuk-do	South Korea	15.5°C
9	Gadeokdo Busan	South Korea	15.1°C
10	Chinhae	South Korea	15.1°C
11	Masan	South Korea	15.1°C
12	Jisepo Gyeongsangnam-do	South Korea	14.7°C
13	Ganggu Gyeongsangnam-do	South Korea	14.7°C
14	Geoje	South Korea	14.6°C
15	Kyosai	South Korea	14.6°C
16	Hoko	South Korea	14.6°C
17	Pohang	South Korea	14.6°C
18	Jeju	South Korea	14.5°C
19	Jejudo	South Korea	14.5°C
20	Jukbyeon Gyeongsangbuk-do	South Korea	14.2°C
21	Geomundo Jeollanam-do	South Korea	14.2°C
22	Yokjido Gyeongsangnam-do	South Korea	14.2°C
23	Reisui	South Korea	13.8°C
24	Cheongsando Jeollanam-do	South Korea	13.7°C
25	Wando Jeollanam-do	South Korea	13.7°C

Show 25 more ▸

26	Ulleungdo Gyeongsangbuk-do	South Korea	13.7°C
27	Chujado Jeju-do	South Korea	13.7°C
28	Mukho Gangwon-do	South Korea	13.7°C
29	Gwanyang Jeollanam-do	South Korea	13.6°C
30	Yeosu Jeollanam-do	South Korea	13.6°C
31	Tonghae	South Korea	13.5°C
32	Narodo Jeollanam-do	South Korea	13.4°C
33	Geumdangdo Jeollanam-do	South Korea	13.3°C
34	Soando Jeollanam-do	South Korea	13.3°C
35	Jumunjin Gangwon-do	South Korea	13.1°C
36	Sunchun	South Korea	13.1°C
37	Yongpyong	South Korea	13.0°C
38	Gangneung	South Korea	13.0°C
39	Sokcho	South Korea	12.5°C
40	Byeokpajin Jeollanam-do	South Korea	12.1°C
41	Eoranjin Jeollanam-do	South Korea	12.1°C
42	Modo Jeollanam-do	South Korea	12.1°C
43	Sangmado Jeollanam-do	South Korea	12.1°C
44	Hataedo Jeollanam-do	South Korea	11.7°C
45	Wido Jeollabuk-do	South Korea	11.0°C
46	Moppo	South Korea	10.6°C
47	Sinan	South Korea	10.6°C
48	Boryeong	South Korea	10.5°C
49	Kunsan	South Korea	10.5°C
50	Daeheuksando Jeollanam-do	South Korea	10.4°C

Coldest 10 in South Korea in April

Same data the other way. Helpful if you want to know which South Korea coasts to avoid for swimming in April.

#	Location	Country	April mean
1	Baengnyeongdo Incheon	South Korea	7.7°C
2	Daecheongdo Incheon	South Korea	7.7°C
3	Mohang-ri Chungcheongnam-do	South Korea	8.1°C
4	Taesal Li	South Korea	8.5°C
5	Anheung Chungcheongnam-do	South Korea	8.6°C
6	Hwaseong	South Korea	8.9°C
7	Incheon	South Korea	8.9°C
8	Eocheongdo Jeollabuk-do	South Korea	9.0°C
9	Ansan	South Korea	9.1°C
10	Goyang	South Korea	9.1°C