Amakusa — Water Temperature in December

Water Temperature Range

15°C

minimum

19°C

average

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