Sasebo — Water Temperature in December

Water Temperature Range

15°C

minimum

18°C

average

21°C

maximum

Get instant access to real-time water temperatures for this and all other locations with our iOS and Android apps.

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	2025	2024	2023	2022
DEC 1	20°C	20°C	20°C	19°C
DEC 2	20°C	20°C	19°C	19°C
DEC 3	19°C	20°C	19°C	19°C
DEC 4	19°C	20°C	19°C	18°C
DEC 5	19°C	19°C	19°C	18°C
DEC 6	19°C	19°C	19°C	19°C
DEC 7	19°C	19°C	19°C	18°C
DEC 8	18°C	19°C	18°C	18°C
DEC 9	18°C	18°C	18°C	18°C
DEC 10	18°C	18°C	18°C	18°C
DEC 11	18°C	18°C	18°C	18°C
DEC 12	18°C	18°C	18°C	18°C
DEC 13	18°C	18°C	18°C	18°C
DEC 14	18°C	18°C	18°C	18°C
DEC 15	18°C	18°C	17°C	17°C
DEC 16	18°C	18°C	17°C	18°C
DEC 17	18°C	18°C	17°C	18°C
DEC 18	18°C	18°C	17°C	18°C
DEC 19	17°C	17°C	17°C	18°C
DEC 20	17°C	17°C	17°C	18°C
DEC 21	17°C	17°C	17°C	17°C
DEC 22	17°C	17°C	17°C	17°C
DEC 23	17°C	17°C	17°C	17°C
DEC 24	17°C	17°C	17°C	17°C
DEC 25	17°C	17°C	16°C	17°C
DEC 26	17°C	17°C	16°C	17°C
DEC 27	17°C	17°C	16°C	17°C
DEC 28	17°C	17°C	16°C	17°C
DEC 29	16°C	17°C	16°C	16°C
DEC 30	16°C	16°C	16°C	16°C
DEC 31	16°C	16°C	16°C	16°C

December: Climate and Swimming Opportunities

Average Night Air Temperature

5°C

Average Day Air Temperature

12°C

Precipitation Amount per Month

64 mm

Number of Rainy Days

Daylight per Day

10 hrs

Sunshine per Day

3 hrs

Average Wind Speed

15 km/h

Average Humidity

69%

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.