What is the current water temperature in Jeju City?

Q: What is the current water temperature in Jeju City?

As of now, in Jeju City, the water temperature is 17.77°C. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it.

South Korea > Jeju City

Water temperature in Jeju City

Detailed information about the current water temperature in Jeju City. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.

64.0

°F

May 18, 14:48

Trend:

stable

Yesterday:

64.0°F

Tomorrow:

64.2°F

Sunrise:

05:32

Sunset:

19:29

Day Length:

13 h. 57 min.

Jeju City in May

Minimum:

58.8°F

Average:

60.9°F

Maximum:

62.2°F

Sea water temperature in Jeju City today

As of now, in Jeju City, the water temperature is 64.0°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. Today's reading is 1.7°F higher than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to rise a bit.

Recent sea temperature and forecast

Today's water temperature is notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 63.7°F on 2019, while the historical minimum was 61.0°F on 2025.

latest data

last year

Observations from the last two weeks indicate that the water temperature was in proximity to the highest values recorded on those days in the past. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 64.9°F, with minimum temperature starting at 64.2°F, while the maximum might reach 65.6°F.

Daily water temperature in Jeju City

Date	Current Year actual* / forecast**	last year	10 years average
May 4	60.8°F	60.0°F	60.8°F
May 5	61.9°F	59.8°F	61.0°F
May 6	61.5°F	60.0°F	61.3°F
May 7	62.2°F	59.6°F	61.3°F
May 8	62.0°F	59.1°F	60.9°F
May 9	62.3°F	59.3°F	61.0°F
May 10	62.6°F	59.6°F	61.2°F
May 11	63.1°F	59.7°F	61.3°F
May 12	64.9°F	59.8°F	61.4°F
May 13	64.4°F	59.3°F	61.5°F
May 14	64.8°F	60.3°F	61.7°F
May 15	64.4°F	61.2°F	62.2°F
May 16	62.9°F	61.3°F	62.2°F
May 17	64.0°F	61.0°F	62.3°F
May 18	64.0°F	61.0°F	62.3°F
May 19	64.2°F	60.7°F	62.5°F
May 20	64.3°F	60.4°F	62.6°F
May 21	64.7°F	61.4°F	63.1°F
May 22	64.9°F	61.2°F	63.2°F
May 23	65.1°F	61.4°F	63.4°F
May 24	65.4°F	61.7°F	63.7°F
May 25	65.6°F	61.8°F	63.9°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Jeju City by month

In Jeju City, the months July through September offer comfortable swimming conditions, which amounts to 106 swimming days.

The warmest water in Jeju City was recorded on August 14, 2016, reaching a 86.5°F. While the coldest temperature occurred on March 6, 2025, dipping to 54.9°F. The average readings by season are 60.3°F in Winter, 59.8°F in Spring, 75.9°F in Summer, and 72.9°F in Autumn.