Kugenuma Rivermouth Surf Break

Kugenuma Rivermouth Sea Temperature and Wetsuit Guide

Lat Long: 35.31° N 139.47° E

Issued: 2 pm 22 Jun 2026 (local time)

Forecast update in  hr  min

Today's Kugenuma Rivermouth sea temperature is
22.7° C

Slightly cooler than normal

Kugenuma Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.

Today's Kugenuma Rivermouth sea temperature is 22.7 °C

(Slightly cooler than normal)

Mean: 23.3 °C
Range: 22.3 °C to 24.2 °C
Statistics for 22 Jun (1981–2005)

    Today, many surfers would wear a shorty .

    Warm in and out of the water temperature at Kugenuma Rivermouth today, but forecast to be overcast. With sea temperatures of 22 °C and a wind chill of 23 °C, most surfers will choose a shorty or a summer suit or just board shorts.

    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 Kugenuma Rivermouth. 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.

    Kugenuma Rivermouth 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.

    Actual sea surface water temperatures close to shore at Kugenuma Rivermouth 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 Kugenuma Rivermouth. Refer to our detailed weather forecasts for this information.

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