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Keta Reef Oshima water temperature
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Keta Reef Oshima Water Temperature and Wetsuit Guide

(Izu Islands, Japan)

Today's Keta Reef Oshima sea temperature is 21.5 °C.

Statistics for 16 Nov (1981–2005) – mean: 21.7 °C, range: 20.5 °C to 22.8 °C

The water temperature (21 °C) at Keta Reef Oshima is warm and the air temperature should feel similar (windchill forecast 19 °C). If the sun does come out as forecast, it should feel warm enough to surf in a shorty or a summer wetsuit.

Japan Sea Water Temperature

Map of current Japan
Surface Water Temperatures
based on measurements from oceanographic satellites
Japan Water Temperature Anomaly

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 Keta Reef Oshima. 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.

Keta Reef Oshima Water Temperature Graph

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.

Oshima Island sea water temperatures peak in the range 26 to 28°C (79 to 82°F) on around the 14th of August and are at their lowest on about the 1st of March, in the range 16 to 18°C (61 to 64°F). Year round warm sea water temperatures at Oshima Island climb to their highest in mid August. Even then a rash vest and board shorts should be fine for surfing at any time of year. The lowest seasonal sea water temperatures at Oshima Island at the beginning of March lend themselves to a 4/3mm wetsuit or a 3/2mm suit and 3mm neoprene boots.

Actual sea surface water temperatures close to shore at Keta Reef Oshima 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 Keta Reef Oshima. Refer to our detailed weather forecasts for this information.