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Unoshima Sea Temperature in December

Fukuoka, Japan

November Unoshima year-round → January

Average sea temperature for Unoshima, Japan across December, based on 10 years of daily readings.

Average

14.58° C

High

17.23° C

Low

11.36° C

Water at this temperature is cold and will feel very cold initially, but the body will get used to it and longer swims are possible. Experienced swimmers can manage several hours of swimming, however hypothermia is still a real risk.

December is the 9th warmest of 12 months at Unoshima. On average the water sits 4.4° than the year-round mean of 18.94° C.

Compared to November, December is 4.4° cooler than (19.03° C in November). By January the water is usually 11.24° C.

Unoshima Day-by-Day Water Temperature in December

10-year low, average and high

10.0° C
12.1° C
14.3° C
16.4° C
18.5° C
1
5
10
15
20
25
31
Day-by-day low and high band with the 10-year daily average through December. Range Average

Each vertical bar above is one day of December. The shaded band covers the range the water has reached on that day across the last 10 years — the lowest reading at the bottom, the highest at the top. The line running through the bars is the daily average over those 10 years, so you can see the typical shape of the month at Unoshima.

A narrow band means the temperature on that day has stayed close to the average year on year. A taller band means it has swung more, often because of changeable weather around that time of year. Hovering a day pulls up its low, average, and high.

December Water Temperature Table for Unoshima

10-year daily averages

Day Average Low High
December 1 16.54° C 15.08° C 17.23° C
December 2 16.37° C 14.96° C 16.91° C
December 3 16.25° C 14.98° C 16.86° C
December 4 16.16° C 15.06° C 16.85° C
December 5 16° C 14.99° C 16.93° C
December 6 15.82° C 14.82° C 16.88° C
December 7 15.59° C 14.58° C 16.76° C
December 8 15.45° C 14.38° C 16.46° C
December 9 15.35° C 14.43° C 16.36° C
December 10 15.19° C 14.35° C 16.31° C
December 11 15.01° C 14.23° C 16.18° C
December 12 14.83° C 14.12° C 16.19° C
December 13 14.68° C 13.81° C 16.21° C
December 14 14.66° C 13.51° C 16.08° C
December 15 14.7° C 13.42° C 16.12° C
December 16 14.62° C 13.26° C 16.19° C
December 17 14.55° C 13.22° C 16.37° C
December 18 14.59° C 13.32° C 16.52° C
December 19 14.47° C 13.47° C 16.17° C
December 20 14.16° C 13.24° C 15.5° C
December 21 14.03° C 12.85° C 15.11° C
December 22 13.9° C 12.86° C 14.9° C
December 23 13.79° C 12.86° C 14.7° C
December 24 13.64° C 12.93° C 14.43° C
December 25 13.51° C 12.53° C 14.31° C
December 26 13.38° C 12.23° C 14.21° C
December 27 13.15° C 11.89° C 14.34° C
December 28 13.07° C 11.76° C 14.71° C
December 29 12.96° C 11.67° C 14.85° C
December 30 12.91° C 11.68° C 14.87° C
December 31 12.74° C 11.36° C 14.89° C

Where December Sits in the Year

December highlighted

4.5° C
11.9° C
19.3° C
26.6° C
34.0° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
11.24° C
9.69° C
11.26° C
14.81° C
18.44° C
22.33° C
26.41° C
28.52° C
27.26° C
23.75° C
19.03° C
14.58° C
10-year monthly history for Unoshima. Bars span historical low to high; the line marks the monthly average. Range Average
January → February → March → April → May → June → July → August → September → October → November → December →

Nearby Locations in December

Compare other Japan water for the same month

Unoshima Location

33.6333, 131.1330

33.63330, 131.13300 View on OpenStreetMap →

Unoshima sits at 33.6333°N, 131.1330°E, on the coast of Fukuoka, Japan. The marker on the map shows the spot the readings on this page come from. It usually sits a short distance from the town centre, out on the open water itself, so the numbers stay tied to the coast rather than a generic point inland.

Coastlines bend, headlands focus the water, and the temperature can run noticeably differently between two beaches that look close together on a map. Comparing nearby locations is a quick way to see how local geography is shaping the readings.

Nearest locations to Unoshima