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Onomichi Sea Temperature in August

Japan

July Onomichi year-round → September

Average sea temperature for Onomichi, Japan across August, based on 10 years of daily readings.

Average

28.3° C

High

29.68° C

Low

26.49° C

This water temperature is comparable to that of a swimming pool, but it might be higher than most open water swimmers prefer for serious swimming. Make sure to drink plenty of water before and after swimming and don't wear a wetsuit to avoid overheating.

August is the 1st warmest of 12 months at Onomichi. On average the water sits 9.0° than the year-round mean of 19.3° C.

Compared to July, August is 2.5° warmer than (25.82° C in July). By September the water is usually 27.42° C.

Onomichi Day-by-Day Water Temperature in August

10-year low, average and high

25.5° C
26.8° C
28.0° C
29.3° C
30.5° C
1
5
10
15
20
25
31
Day-by-day low and high band with the 10-year daily average through August. Range Average

Each vertical bar above is one day of August. 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 Onomichi.

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.

August Water Temperature Table for Onomichi

10-year daily averages

Day Average Low High
August 1 28.04° C 27.44° C 28.94° C
August 2 27.93° C 27.09° C 28.7° C
August 3 27.99° C 27.02° C 28.99° C
August 4 27.98° C 27.04° C 29.29° C
August 5 27.98° C 26.61° C 29.26° C
August 6 28.15° C 27.25° C 29.35° C
August 7 28.22° C 27.28° C 29.24° C
August 8 28.22° C 26.62° C 29.67° C
August 9 28.22° C 26.54° C 29.63° C
August 10 28.21° C 26.61° C 29.26° C
August 11 28.29° C 26.76° C 29.07° C
August 12 28.36° C 27.11° C 28.94° C
August 13 28.21° C 27.42° C 28.95° C
August 14 28.29° C 27.42° C 29.26° C
August 15 28.39° C 27.05° C 29.36° C
August 16 28.45° C 26.99° C 29.44° C
August 17 28.31° C 26.63° C 29.5° C
August 18 28.37° C 26.58° C 29.5° C
August 19 28.45° C 26.66° C 29.43° C
August 20 28.49° C 26.73° C 29.51° C
August 21 28.56° C 26.97° C 29.68° C
August 22 28.51° C 27.19° C 29.12° C
August 23 28.4° C 27.29° C 29.23° C
August 24 28.4° C 27.52° C 29.42° C
August 25 28.38° C 27.08° C 29.32° C
August 26 28.35° C 26.99° C 29.3° C
August 27 28.42° C 26.94° C 29.41° C
August 28 28.46° C 26.79° C 29.45° C
August 29 28.41° C 26.6° C 29.06° C
August 30 28.4° C 26.56° C 29.11° C
August 31 28.3° C 26.49° C 29.14° C

Where August Sits in the Year

August highlighted

6.5° C
13.1° C
19.8° C
26.4° C
33.0° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
12.73° C
11.23° C
11.63° C
14.55° C
17.84° C
21.62° C
25.82° C
28.3° C
27.42° C
24.37° C
20.04° C
16.09° C
10-year monthly history for Onomichi. 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 August

Compare other Japan water for the same month

Onomichi Location

34.4089, 133.2049

34.40890, 133.20491 View on OpenStreetMap →

Onomichi sits at 34.4089°N, 133.2049°E, on the coast of 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 Onomichi