Ishigaki — Water Temperature in December

Water Temperature Range

14°C

minimum

18°C

average

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

December: Climate and Swimming Opportunities

Average Night Air Temperature

12°C

Average Day Air Temperature

11°C

Precipitation Amount per Month

24 mm

Number of Rainy Days

Daylight per Day

11 hrs

Sunshine per Day

6 hrs

Average Wind Speed

12 km/h

Average Humidity

71%

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.