All data are in degrees Fahrenheit

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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.
Sea temperature in Jeju City now

78.6

°F

September 17, 10:37

Trend:

decreasing

Yesterday:

78.6°F

Tomorrow:

78.4°F

Sunrise:

06:18

Sunset:

18:39

Day Length:

12 h. 21 min.

Jeju City in September

Minimum:

59.4°F

Average:

60.9°F

Maximum:

62.0°F

Sea water temperature in Jeju City today

As of now, in Jeju City, the water temperature is 78.6°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 0.2°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 fall a bit.

Recent sea temperature and forecast

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It also falls within the range of the average temperature recorded for this date, suggesting a consistent weather trend. The maximum temperature recorded for this date was 83.9°F on 2024, while the historical minimum was 74.4°F on 2020.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the maximum recorded over the past years. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 77.5°F, the minimum temperature may reach 76.7°F, and the maximum might stay at 78.4°F.

Daily water temperature in Jeju City

Date Current Year

actual* / forecast**

last year 10 years average
Sep 3 84.1°F 85.7°F 80.7°F
Sep 4 82.7°F 83.7°F 80.1°F
Sep 5 81.4°F 83.9°F 79.7°F
Sep 6 79.5°F 83.2°F 79.8°F
Sep 7 79.7°F 85.6°F 80.0°F
Sep 8 80.9°F 85.1°F 79.5°F
Sep 9 81.4°F 83.5°F 79.5°F
Sep 10 80.9°F 83.4°F 79.4°F
Sep 11 79.3°F 82.1°F 79.0°F
Sep 12 77.6°F 81.7°F 78.7°F
Sep 13 77.1°F 84.1°F 78.7°F
Sep 14 77.5°F 82.7°F 78.2°F
Sep 15 79.7°F 83.3°F 78.6°F
Sep 16 78.6°F 83.2°F 78.4°F
Sep 17 78.6°F 83.8°F 78.4°F
Sep 18 78.4°F 83.4°F 78.2°F
Sep 19 78.1°F 83.9°F 77.9°F
Sep 20 77.4°F 82.4°F 77.3°F
Sep 21 77.7°F 82.4°F 77.5°F
Sep 22 77.5°F 82.0°F 77.3°F
Sep 23 77.0°F 80.0°F 76.8°F
Sep 24 76.7°F 79.8°F 76.5°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, 76.0°F in Summer, and 73.0°F in Autumn.