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Muroran Sea Temperature in May

Hokkaidō, Japan

April Muroran year-round → June

Average sea temperature for Muroran, Japan across May, based on 10 years of daily readings.

Average

9.56° C

High

13.52° C

Low

5.43° C

This water is very cold and can cause pain. We don't recommend you swim in this temperature for anything other than very short swims of 5 to 10 minutes unless you are a very experienced cold water swimmer.

May is the 8th warmest of 12 months at Muroran. On average the water sits 2.8° than the year-round mean of 12.33° C.

Compared to April, May is 3.7° warmer than (5.83° C in April). By June the water is usually 14.82° C.

Muroran Day-by-Day Water Temperature in May

10-year low, average and high

4.0° C
6.8° C
9.5° C
12.3° C
15.0° C
1
5
10
15
20
25
31
Day-by-day low and high band with the 10-year daily average through May. Range Average

Each vertical bar above is one day of May. 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 Muroran.

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.

May Water Temperature Table for Muroran

10-year daily averages

Day Average Low High
May 1 7.5° C 6.17° C 8.48° C
May 2 7.6° C 5.68° C 8.5° C
May 3 7.65° C 5.43° C 8.75° C
May 4 7.76° C 5.99° C 8.94° C
May 5 7.61° C 6.28° C 8.94° C
May 6 7.7° C 6.64° C 9.06° C
May 7 7.91° C 7.03° C 9.29° C
May 8 8.02° C 6.91° C 9.56° C
May 9 8.1° C 6.99° C 9.31° C
May 10 8.33° C 7.38° C 9.49° C
May 11 8.49° C 7.16° C 9.76° C
May 12 8.68° C 7.18° C 9.91° C
May 13 9.05° C 7.45° C 10.25° C
May 14 9.48° C 8.2° C 10.79° C
May 15 9.61° C 8.53° C 11.22° C
May 16 9.77° C 8.75° C 11.29° C
May 17 9.97° C 8.67° C 11.34° C
May 18 9.96° C 8.44° C 11.42° C
May 19 10.36° C 8.69° C 11.66° C
May 20 10.6° C 8.68° C 11.64° C
May 21 10.6° C 8.39° C 11.91° C
May 22 10.83° C 8.26° C 12.24° C
May 23 11.05° C 8.44° C 12.3° C
May 24 11.28° C 9.24° C 12.43° C
May 25 11.37° C 9.5° C 12.59° C
May 26 11.39° C 9.61° C 12.5° C
May 27 11.61° C 10.2° C 12.47° C
May 28 11.7° C 10.41° C 12.95° C
May 29 11.63° C 10.41° C 13.2° C
May 30 11.96° C 10.52° C 13.23° C
May 31 11.99° C 10.46° C 13.52° C

Where May Sits in the Year

May highlighted

-2.5° C
5.3° C
13.0° C
20.8° C
28.5° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
6.36° C
4.1° C
3.42° C
5.83° C
9.56° C
14.82° C
19.47° C
22.31° C
21.25° C
17.74° C
13.32° C
9.72° C
10-year monthly history for Muroran. 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 May

Compare other Japan water for the same month

Muroran Location

42.3500, 140.9500

42.35000, 140.95000 View on OpenStreetMap →

Muroran sits at 42.3500°N, 140.9500°E, on the coast of Hokkaidō, 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 Muroran