Nagasaki — Water Temperature in January

Water Temperature Range

14°C

minimum

16°C

average

19°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	17°C	18°C	16°C	16°C
JAN 2	18°C	15°C	17°C	18°C
JAN 3	17°C	16°C	16°C	17°C
JAN 4	17°C	16°C	17°C	18°C
JAN 5	17°C	16°C	16°C	16°C
JAN 6	17°C	16°C	17°C	18°C
JAN 7	17°C	15°C	16°C	18°C
JAN 8	16°C	16°C	16°C	19°C
JAN 9	17°C	16°C	16°C	18°C
JAN 10	16°C	16°C	14°C	19°C
JAN 11	16°C	15°C	15°C	19°C
JAN 12	17°C	15°C	15°C	15°C
JAN 13	17°C	15°C	15°C	16°C
JAN 14	16°C	15°C	15°C	15°C
JAN 15	16°C	15°C	15°C	18°C
JAN 16	16°C	15°C	15°C	15°C
JAN 17	16°C	15°C	15°C	17°C
JAN 18	16°C	15°C	15°C	15°C
JAN 19	16°C	15°C	15°C	18°C
JAN 20	16°C	14°C	15°C	18°C
JAN 21	15°C	15°C	15°C	18°C
JAN 22	16°C	14°C	15°C	19°C
JAN 23	16°C	15°C	15°C	16°C
JAN 24	16°C	15°C	15°C	18°C
JAN 25	15°C	15°C	15°C	18°C
JAN 26	15°C	14°C	15°C	16°C
JAN 27	15°C	15°C	16°C	16°C
JAN 28	15°C	15°C	16°C	18°C
JAN 29	15°C	15°C	16°C	15°C
JAN 30	15°C	15°C	16°C	15°C
JAN 31	14°C	14°C	16°C	16°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 usually feels uncomfortably cold. Even a short dip can leave you chilled, especially once you get out into the cool air.