Today's Nichinan sea temperature is 28.0 °C
(Slightly warmer than usual (0.7° above average))
| Mean: | 27.3 °C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Range: | 26.4 °C to 28.4 °C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statistics for 21 Sep (1981–2005) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Today, many surfers would wear a rashvest wetsuit.
Sunny with very warm air temperatures, feeling like 26 °C once we account for any wind. Sea temperatures (28 °C) very warm too. Staying comfortable in the water at Nichinan won't be a problem, but wear at least a rash-vest to keep the UV off.
 Map of current Japan Surface Water Temperatures (based on measurements from oceanographic satellites) |  Map of current Japan Sea Water Temperature Anomalies (compared with long term averages at this time of year) |
click thumbnails to expand
Below is a graph of Historical Sea Surface Temperature for Nichinan. This has been derived from analysis of two decades of oceanographic satellite measurements of nearby open water. We have calculated the average water temperature variation around the year as well as the extremes that have been observed on each date.
All of the graphs for the surf breaks presented on Surf-Forecast.com are on the same scale to enable comparison between locations around the world.
Nichinan sea water temperatures peak in the range 27 to 30°C (81 to 86°F) on around the 3rd of August and are at their minimum on about the 1st of March, in the range 18 to 20°C (64 to 68°F). Year round warm sea water temperatures at Nichinan climb to their highest at the start of August. Even then a rash vest and board shorts should be fine for surfing at any time of year. The minimum Nichinan sea water temperatures at the beginning of March require something like a 3/2mm fully sealed wetsuit.
Actual sea surface water temperatures close to shore at Nichinan can vary by several degrees compared with these open water averages. This is especially true after heavy rain, close to river mouths or after long periods of strong offshore winds. Offshore winds cause colder deep water to replace surface water that has been warmed by the sun. Air temperature, wind-chill and sunshine should also be considered before deciding on the kind of wetsuit needed to stay warm when surfing at Nichinan. Refer to our detailed weather forecasts for this information.
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