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Updating conditions · Calibrated break

Kugenuma Rivermouth

Shonan · Kanagawa, Japan · Beach break

Local time — · Sunrise 06:11 · Sunset 16:42

Verified data gate

Reading the ocean.

SWELLRADAR is requesting a verified marine run for Kugenuma Rivermouth.

Marine sourceChecking
Synthetic valuesBlocked
RefreshAutomatic
Spot calibratedSpot-calibrated profile

Spot intelligence.

The long community name is normalised to Kugenuma Rivermouth and calibrated for south-sector windswells or typhoon energy. Tide influence stays adaptive because the river mouth and banks shift through the season.

Profile source · Surf-Forecast Kugenuma Rivermouth guide
NS

Profile geometry

Swell axis S · 180°

Offshore wind from N · All levels profile

Wave

Predominantly left-breaking river-mouth banks with secondary peaks

Shifting river-mouth sand banks

Swell window

S typhoon swell or local windswell

0.4–2.2 m offshore ranking band

Clean wind

N–NNE offshore

Applied to wind scoring

Tide window

All tides · riverbank dependent

Qualitative timing guidance

Field guide

Read the break.

Character

01

Kugenuma Rivermouth is defined by predominantly left-breaking river-mouth banks with secondary peaks over shifting river-mouth sand banks. The shape can change with swell angle, period and the active section, so the live score should always be paired with a visual check from shore.

Best setup

02

S typhoon swell or local windswell swell, n–nne offshore and all tides · riverbank dependent form the profile baseline. SWELLRADAR treats 0.4–2.2 m as a working range, not a guarantee of breaking-wave size.

Lineup read

03

Match the active peak to your ability and leave space for other surfers in the water. Pay particular attention to crowded lineup, river current, runoff after rain. Local signs and advice always take priority.

Know before you paddle

Live conditions and local advice always override this profile.

Crowded lineupRiver currentRunoff after rainRapidly shifting banks
Optional community layerRecent surfer reportsVoluntary and potentially incomplete. Not used for the forecast or Surf Score.

The break

Beach break

All levels. Works best with S typhoon swell or local windswell swell.

Timing

N–NNE offshore

All tides · riverbank dependent. Re-check local observations and the lineup before you paddle out.

Data note

Model data unavailable

SWELLRADAR withholds numerical conditions, scores and surf windows until a quality-checked marine forecast is available.