Swimming in South Korea in may 2025 Sea temperature by city in may
Do you want to go to the beach in South Korea in may 2025? Is it the right month to go for pleasant temperatures and staying in the water for a long time? The answer is on this page with the sea temperatures in may in South Korea by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in South Korea in may 2025
Here, find the average sea temperature in South Korea in may in several coastal cities.
South in may
63°F
min: 58°F / max: 67°F
62°F
min: 58°F / max: 68°F
Namhae
61°F
min: 56°F / max: 67°F
Tongyeong
62°F
min: 58°F / max: 67°F
Ulsan
62°F
min: 58°F / max: 66°F
Yeosu
61°F
min: 56°F / max: 67°F
Northeast in may
North West in may
56°F
min: 49°F / max: 64°F
Ansan-si
56°F
min: 49°F / max: 64°F
Hwaseong-si
56°F
min: 49°F / max: 64°F
East in may
61°F
min: 57°F / max: 65°F
Gyeongju
61°F
min: 57°F / max: 65°F
Uljin
60°F
min: 55°F / max: 65°F
West in may
Gunsan
58°F
min: 50°F / max: 65°F
Where should you go swimming in South Korea in the month of may?
Swimming in South Korea in may is cool (in the best case scenario)
In may in South Korea swimming conditions vary by city. Details below:
Swimming in may in Gaigeturi is possible but the sea is generally cool. So though the sea temperature may sometimes reach 69°F, it can also go as low as 58°F. Note that the average is 64°F.
Swimming in may in Busan, Jeju Island (Jejudo), Pohang, Gyeongju, Namhae, Tongyeong, Uljin, Ulsan, Yeosu, Goseong, Jangan, Oepo and Seogwipo is possible... with a wetsuit! Indeed, the water is cold at this time of year with an average temperature of 63°F (min: 58°F/max: 67°F).
Forget about swimming in Gangneung, Incheon, Sokcho, Ansan-si, Gunsan, Haenam, Hwaseong-si, Moppo and Muan in may! The water temperature is freezing, reaching as low as 54°F (and only 65°F at the best of times). Our advice: plan on sightseeing, and don't bring your beach towel!
Where to go swimming in South Korea in may: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in may
Busan
| May | |||
| Average sea temperature | 63°F | ||
| Minimum sea temperature | 58°F | ||
| Maximum sea temperature | 67°F | ||
| Average outside temperature | 65°F | ||
| Maximum outside temperature | 70°F | ||
| Minimum outside temperature | 61°F | ||
| Precipitation | 3.9in | ||
| Number of days of precipitation | 5 jour(s) (15%) | ||
| Cloud cover | 32% | ||
| Our opinion | cold swimming |
More information on swimming in Busan in may
Jeju Island (Jejudo)
| May | |||
| Average sea temperature | 62°F | ||
| Minimum sea temperature | 58°F | ||
| Maximum sea temperature | 68°F | ||
| Average outside temperature | 65°F | ||
| Maximum outside temperature | 68°F | ||
| Minimum outside temperature | 61°F | ||
| Precipitation | 6.1in | ||
| Number of days of precipitation | 5 jour(s) (17%) | ||
| Cloud cover | 37% | ||
| Our opinion | cold swimming |
More information on swimming in Jeju Island (Jejudo) in may
Gangneung
| May | |||
| Average sea temperature | 59°F | ||
| Minimum sea temperature | 54°F | ||
| Maximum sea temperature | 65°F | ||
| Average outside temperature | 61°F | ||
| Maximum outside temperature | 68°F | ||
| Minimum outside temperature | 54°F | ||
| Precipitation | 3.9in | ||
| Number of days of precipitation | 5 jour(s) (15%) | ||
| Cloud cover | 27% | ||
| Our opinion | freezing swimming |
More information on swimming in Gangneung in may
Incheon
| May | |||
| Average sea temperature | 56°F | ||
| Minimum sea temperature | 49°F | ||
| Maximum sea temperature | 64°F | ||
| Average outside temperature | 65°F | ||
| Maximum outside temperature | 70°F | ||
| Minimum outside temperature | 59°F | ||
| Precipitation | 5in | ||
| Number of days of precipitation | 5 jour(s) (17%) | ||
| Cloud cover | 30% | ||
| Our opinion | freezing swimming |
More information on swimming in Incheon in may
Pohang
| May | |||
| Average sea temperature | 61°F | ||
| Minimum sea temperature | 57°F | ||
| Maximum sea temperature | 65°F | ||
| Average outside temperature | 65°F | ||
| Maximum outside temperature | 70°F | ||
| Minimum outside temperature | 58°F | ||
| Precipitation | 4.2in | ||
| Number of days of precipitation | 5 jour(s) (15%) | ||
| Cloud cover | 30% | ||
| Our opinion | cold swimming |
More information on swimming in Pohang in may
List of coastal cities in South Korea
| Busan in may | cold swimming |
| Jeju Island (Jejudo) in may | cold swimming |
| Gangneung in may | freezing swimming |
| Incheon in may | freezing swimming |
| Pohang in may | cold swimming |
| Sokcho in may | freezing swimming |
| Gyeongju in may | cold swimming |
| Namhae in may | cold swimming |
| Tongyeong in may | cold swimming |
| Uljin in may | cold swimming |
| Ulsan in may | cold swimming |
| Yeosu in may | cold swimming |
| Ansan-si in may | freezing swimming |
| Gaigeturi in may | cool swimming |
| Goseong in may | cold swimming |
| Gunsan in may | freezing swimming |
| Haenam in may | freezing swimming |
| Hwaseong-si in may | freezing swimming |
| Jangan in may | cold swimming |
| Moppo in may | freezing swimming |
| Muan in may | freezing swimming |
| Oepo in may | cold swimming |
| Seogwipo in may | cold swimming |