Chiba and Ibaraki · Today

Shidashita

Updated Wed, Sep 23, 8:40 AM GMT+9

When to go

Around 5:00 PM

Looks good · Low confidence

4.1–4.1 ft · Offshore waves · not face height

Wind: 4.6 kt · direction unavailable

Forecast details

Light wind should keep the water smoother.

Other wind windows

Plan around the wind

The best available upcoming daylight wind sample to compare with the wave evidence. This compares wind only; wave size, tide suitability, and hazards can change your choice.

3:00 PM–5:00 PM · Asia/Tokyo
Wind speed available · shore exposure unknown · up to 8.1 kt · reported gusts up to 15.7 kt
Offshore waves: 4.1–4.2 ft across the period. Surf height unavailable. Tide data unavailable.
Wind source time: Sep 23, 8:30 AM GMT+9. This is not the model run issue time.

How these periods are chosen

The planner prefers three consecutive hourly samples covering two daylight hours, but retains shorter one- or two-sample evidence when that is all the forecast provides. Light wind means at most 6 kt. Moderate offshore means at most 12 kt from land toward the sea when shore orientation is verified. Strong wind or known gusts of 20 kt or more remain visible as cautions instead of making the entire comparison disappear. These are comparison labels, not locally tested surf-quality or safety ratings. Missing gusts remain unknown. Terrain shelter, currents, closures, and your ability are not assessed.

Forecast confidence

Returned marine grid point is 6.4 km from the mapped spot. Provider grid resolution is not established for this response.
Reference model hour: 0 hours from now; historical residuals do not measure forecast lead-time error.
No accepted local model for these inputs: missing history, unsupported direction/period/height, or failed historical validation.
Tide unavailable: assessment incomplete, especially at shallow reef breaks.
A mapped coordinate does not establish nearshore grid resolution or terrain/shelter accuracy.

Wind NE 9.6 kt

Tide Unavailable

Wave, wind and tide details

Offshore model swellENE 2.8 ft @ 7sValid 2026-09-23 09:00 · Asia/TokyoMarine grid 35.2917, 140.4584 · offshore model, not a local measurement

Offshore model sea4.1 ft @ 6.7sSignificant wave height including wind waves and swell; not breaking surfValid 2026-09-23 09:00 · Asia/Tokyo

Model windNE 9.6 ktunavailableValid 2026-09-23 09:00 · Asia/Tokyo

TideUnavailableunavailableNo verified local tide station connected; no tide height estimated

Surf height unavailable. Coastal and offshore waves are not breaking-wave heights.

Surf and wind

Recommended window: No recommended window

Breaking surf is not reliably resolved. Hourly offshore swell and wind inputs are listed below.

Hourly forecast

Hourly surf forecast for Shidashita
Time	Wind	Tide	Offshore swell
12 AM	ENE 5.8 ktunavailable	Unavailableunavailable	SE 3.1 ft @ 6s
1 AM	ENE 6.8 ktunavailable	Unavailableunavailable	SE 3.1 ft @ 6s
2 AM	NE 8.4 ktunavailable	Unavailableunavailable	SE 3.2 ft @ 6s
3 AM	NE 10.3 ktunavailable	Unavailableunavailable	SE 3.2 ft @ 6s
4 AM	NE 10.6 ktunavailable	Unavailableunavailable	ESE 3.0 ft @ 6s
5 AM	NE 11 ktunavailable	Unavailableunavailable	E 2.8 ft @ 7s
6 AM	NE 10.7 ktunavailable	Unavailableunavailable	ENE 2.5 ft @ 8s
7 AM	NE 10.2 ktunavailable	Unavailableunavailable	ENE 2.6 ft @ 8s
8 AM	NE 9.5 ktunavailable	Unavailableunavailable	ENE 2.7 ft @ 7s
9 AM	NE 9.6 ktunavailable	Unavailableunavailable	ENE 2.8 ft @ 7s
10 AM	NE 9.9 ktunavailable	Unavailableunavailable	ENE 2.9 ft @ 7s
11 AM	NE 9.5 ktunavailable	Unavailableunavailable	ENE 3.0 ft @ 7s
Noon	NE 9.4 ktunavailable	Unavailableunavailable	ENE 3.1 ft @ 7s
1 PM	NE 9.1 ktunavailable	Unavailableunavailable	ENE 3.0 ft @ 7s
2 PM	NE 8.8 ktunavailable	Unavailableunavailable	ENE 3.0 ft @ 7s
3 PM	NE 8.1 ktunavailable	Unavailableunavailable	ENE 3.0 ft @ 7s
4 PM	NE 6.4 ktunavailable	Unavailableunavailable	ENE 3.0 ft @ 7s
5 PM	ENE 4.6 ktunavailable	Unavailableunavailable	ENE 3.0 ft @ 7s
6 PM	E 5.1 ktunavailable	Unavailableunavailable	ENE 3.0 ft @ 6s
7 PM	ESE 5.5 ktunavailable	Unavailableunavailable	E 3.0 ft @ 6s
8 PM	ESE 5.5 ktunavailable	Unavailableunavailable	ESE 3.1 ft @ 6s
9 PM	ESE 5.8 ktunavailable	Unavailableunavailable	ESE 3.1 ft @ 5s
10 PM	SE 6.3 ktunavailable	Unavailableunavailable	ESE 3.1 ft @ 5s
11 PM	SE 6.3 ktunavailable	Unavailableunavailable	ESE 3.1 ft @ 5s

12 AMUnavailable

WindENE 5.8 ktunavailableTideUnavailableunavailableOffshore swellSE 3.1 ft @ 6s

1 AMUnavailable

WindENE 6.8 ktunavailableTideUnavailableunavailableOffshore swellSE 3.1 ft @ 6s

2 AMUnavailable

WindNE 8.4 ktunavailableTideUnavailableunavailableOffshore swellSE 3.2 ft @ 6s

3 AMUnavailable

WindNE 10.3 ktunavailableTideUnavailableunavailableOffshore swellSE 3.2 ft @ 6s

4 AMUnavailable

WindNE 10.6 ktunavailableTideUnavailableunavailableOffshore swellESE 3.0 ft @ 6s

5 AMUnavailable

WindNE 11 ktunavailableTideUnavailableunavailableOffshore swellE 2.8 ft @ 7s

6 AMUnavailable

WindNE 10.7 ktunavailableTideUnavailableunavailableOffshore swellENE 2.5 ft @ 8s

7 AMUnavailable

WindNE 10.2 ktunavailableTideUnavailableunavailableOffshore swellENE 2.6 ft @ 8s

8 AMUnavailable

WindNE 9.5 ktunavailableTideUnavailableunavailableOffshore swellENE 2.7 ft @ 7s

9 AMUnavailable

WindNE 9.6 ktunavailableTideUnavailableunavailableOffshore swellENE 2.8 ft @ 7s

10 AMUnavailable

WindNE 9.9 ktunavailableTideUnavailableunavailableOffshore swellENE 2.9 ft @ 7s

11 AMUnavailable

WindNE 9.5 ktunavailableTideUnavailableunavailableOffshore swellENE 3.0 ft @ 7s

NoonUnavailable

WindNE 9.4 ktunavailableTideUnavailableunavailableOffshore swellENE 3.1 ft @ 7s

1 PMUnavailable

WindNE 9.1 ktunavailableTideUnavailableunavailableOffshore swellENE 3.0 ft @ 7s

2 PMUnavailable

WindNE 8.8 ktunavailableTideUnavailableunavailableOffshore swellENE 3.0 ft @ 7s

3 PMUnavailable

WindNE 8.1 ktunavailableTideUnavailableunavailableOffshore swellENE 3.0 ft @ 7s

4 PMUnavailable

WindNE 6.4 ktunavailableTideUnavailableunavailableOffshore swellENE 3.0 ft @ 7s

5 PMUnavailable

WindENE 4.6 ktunavailableTideUnavailableunavailableOffshore swellENE 3.0 ft @ 7s

6 PMUnavailable

WindE 5.1 ktunavailableTideUnavailableunavailableOffshore swellENE 3.0 ft @ 6s

7 PMUnavailable

WindESE 5.5 ktunavailableTideUnavailableunavailableOffshore swellE 3.0 ft @ 6s

8 PMUnavailable

WindESE 5.5 ktunavailableTideUnavailableunavailableOffshore swellESE 3.1 ft @ 6s

9 PMUnavailable

WindESE 5.8 ktunavailableTideUnavailableunavailableOffshore swellESE 3.1 ft @ 5s

10 PMUnavailable

WindSE 6.3 ktunavailableTideUnavailableunavailableOffshore swellESE 3.1 ft @ 5s

11 PMUnavailable

WindSE 6.3 ktunavailableTideUnavailableunavailableOffshore swellESE 3.1 ft @ 5s

Tide

Local tide station unavailable

Tide predictions are unavailable for this period.

About this spot

Model-grid forecast requested at the mapped coordinate; reef, headland, and nearshore transformations are unresolved. Beach break. Named beach/break area coordinate; published map precision is not a coastline survey. Coastline bearing remains unresolved.

Mapped spot coordinate: 35.3282, 140.4044.

Honshu · Pacific Ocean · Coastline orientation unresolved · Location provenance

Model request point: Shidashita (35.3282, 140.4044). Model output times describe valid conditions; the provider does not expose the model run issue time in this response.

Forecast sources

Data coverage 2/5 sources

Source availability is not forecast accuracy. Where an empirical model passes historical testing, its error and interval coverage are shown above. Source count cannot increase that confidence.

Coverage tier B · JAPAN · spot-level model point

Japan Meteorological Agency Marine/Wave Forecasts
Official wave forecasts and charts; market adapter or station mapping not connectedUnavailableNo source time
NOWPHAS Japan
Real-time and historical wave/tide observations; market adapter or station mapping not connectedUnavailableNo source time
WorldTides API
Tide predictions and station lookup; market adapter or station mapping not connectedUnavailableNo source time
Open-Meteo Marine API
1 of 1 configured model points availableCurrentSep 23, 8:30 AM GMT+9
Open-Meteo Weather API
1 of 1 configured model points availableCurrentSep 23, 8:30 AM GMT+9
Surf-Forecast public pages
Spot discovery and break-specific HTML fallbackNot applicableNo source time
Surfline public spot pages
Break-specific comparison, cams, and metadataNot applicableNo source time

How best guesses are made

Best guesses combine usable wave and wind evidence, with qualitative confidence and specific limitations. A missing tide or local surf-height model does not prevent useful guidance. Tide levels use the named station datum; their effect at this break remains uncertain. Wind direction is relative to the mapped beach orientation, without calibrated terrain or shelter effects. The comparison is a heuristic, not a measured quality rating.