Jeju Island — Water Temperature in January

Water Temperature Range

9°C

minimum

13°C

average

16°C

maximum

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Water Temperature Chart for Month

The chart shows the average daily water temperature for each day of the month based on historical data.

Table of Water Temperatures by Day of the Month for Previous Years

Day	2026	2025	2024	2023
JAN 1	15°C	15°C	15°C	15°C
JAN 2	16°C	16°C	16°C	15°C
JAN 3	16°C	16°C	16°C	15°C
JAN 4	16°C	16°C	16°C	15°C
JAN 5	15°C	15°C	16°C	14°C
JAN 6	15°C	15°C	16°C	14°C
JAN 7	15°C	15°C	16°C	14°C
JAN 8	15°C	15°C	16°C	14°C
JAN 9	15°C	15°C	15°C	14°C
JAN 10	14°C	14°C	15°C	13°C
JAN 11	14°C	14°C	15°C	13°C
JAN 12	14°C	14°C	14°C	13°C
JAN 13	14°C	14°C	15°C	13°C
JAN 14	14°C	14°C	15°C	13°C
JAN 15	14°C	14°C	15°C	12°C
JAN 16	14°C	14°C	15°C	12°C
JAN 17	14°C	14°C	15°C	12°C
JAN 18	14°C	14°C	15°C	12°C
JAN 19	13°C	13°C	14°C	12°C
JAN 20	13°C	13°C	15°C	11°C
JAN 21	13°C	13°C	14°C	11°C
JAN 22	13°C	13°C	14°C	11°C
JAN 23	13°C	13°C	15°C	11°C
JAN 24	13°C	13°C	15°C	11°C
JAN 25	13°C	13°C	15°C	10°C
JAN 26	13°C	13°C	15°C	10°C
JAN 27	12°C	12°C	13°C	10°C
JAN 28	12°C	12°C	13°C	10°C
JAN 29	12°C	12°C	13°C	10°C
JAN 30	11°C	11°C	13°C	9°C
JAN 31	11°C	11°C	13°C	9°C

January: Climate and Swimming Opportunities

Average Night Air Temperature

3°C

Average Day Air Temperature

10°C

Precipitation Amount per Month

69 mm

Number of Rainy Days

Daylight per Day

10 hrs

Sunshine per Day

3 hrs

Average Wind Speed

15 km/h

Average Humidity

67%

With such a ratio between the average monthly temperatures of water and air, swimming feels very cold and is only for cold-water enthusiasts. Most people will prefer just a brief splash, because warming up afterward can take time.