Hainan · Thursday, Sep 24

Riyue Bay

Updated Wed, Sep 23, 8:10 AM GMT+8

When to go

7:00 AM–9:00 AM

Looks good · Low confidence

1.2–1.2 ft · Offshore waves · not face height

Wind: 4.2 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.

7:00 AM–9:00 AM · Asia/Shanghai
Light wind · up to 4.2 kt · reported gusts up to 12.2 kt
Offshore waves: 1.2–1.2 ft across the period. Surf height unavailable. Tide data available; check the local tide response.
Wind source time: Sep 23, 7:30 AM GMT+8. 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 0.9 km from the mapped spot. Provider grid resolution is not established for this response.
Reference model hour: 24 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.
A mapped coordinate does not establish nearshore grid resolution or terrain/shelter accuracy.

Wind NNE 3.8 kt

Tide 3 ft rising

Wave, wind and tide details

Offshore model swellE 0.9 ft @ 3sValid 2026-09-24 08:00 · Asia/ShanghaiMarine grid 18.6250, 110.2084 · offshore model, not a local measurement

Offshore model sea1.2 ft @ 4.7sSignificant wave height including wind waves and swell; not breaking surfValid 2026-09-24 08:00 · Asia/Shanghai

Model windNNE 3.8 ktcross-shoreValid 2026-09-24 08:00 · Asia/Shanghai1.7 kt offshore component

Tide3 ftrisingSouth China Sea Forecast Center Wuchang (乌场) · 33.9 km from Riyue Bay · predicted height relative to station-relative local gauge datumRetrieved Sep 23, 8:19 AM GMT+8 · provider issue time unavailable17% of adjacent local low–high range · descriptive, not a safety rating

Hainan Meteorological Observatory · 本岛东部

多云有雷阵雨; 偏东风5级阵风6级; visibility not supplied.

48小时 lead; provider does not publish an explicit start/end intervalOfficial named-zone marine weather. This zone row supplies no wave height and is not a surf forecast.Issued Sep 23, 7:00 AM GMT+8

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 Riyue Bay
Time	Wind	Tide	Offshore swell
12 AM	NNW 4.2 ktoffshore	5 ftnear high	ESE 1.2 ft @ 3s
1 AM	NNW 3.1 ktoffshore	5 ftfalling	ESE 1.2 ft @ 3s
2 AM	NNW 3.3 ktoffshore	4.5 ftfalling	ESE 1.2 ft @ 3s
3 AM	NNW 3 ktoffshore	4 ftfalling	ESE 1.2 ft @ 3s
4 AM	NW 2.5 ktoffshore	4 ftfalling	ESE 1.2 ft @ 3s
5 AM	NNW 2.8 ktoffshore	3.5 ftfalling	ESE 1.2 ft @ 3s
6 AM	NNW 2.1 ktoffshore	3 ftfalling	ESE 1.1 ft @ 3s
7 AM	N 3.5 ktoffshore	3 ftrising	E 1.0 ft @ 3s
8 AM	NNE 3.8 ktcross-shore	3 ftrising	E 0.9 ft @ 3s
9 AM	NE 4.2 ktcross-shore	3.5 ftrising	E 0.8 ft @ 3s
10 AM	NE 3.9 ktcross-shore	4 ftrising	E 0.8 ft @ 4s
11 AM	E 4.9 ktcross-shore	4 ftrising	E 0.7 ft @ 4s
Noon	E 6 ktonshore	4.5 ftrising	E 0.7 ft @ 4s
1 PM	ESE 5.9 ktonshore	4.5 ftnear high	E 0.7 ft @ 4s
2 PM	ESE 6 ktonshore	4.5 ftfalling	E 0.7 ft @ 4s
3 PM	ESE 6 ktonshore	4.5 ftfalling	E 0.7 ft @ 3s
4 PM	ESE 6.1 ktonshore	4 ftfalling	E 0.7 ft @ 3s
5 PM	ESE 6 ktonshore	4 ftfalling	E 0.7 ft @ 4s
6 PM	E 3.7 ktonshore	3.5 ftnear low	E 0.7 ft @ 4s
7 PM	E 2.2 ktcross-shore	3.5 ftrising	E 0.7 ft @ 4s
8 PM	SE 2.2 ktonshore	4 ftrising	E 0.7 ft @ 4s
9 PM	ESE 0.8 ktonshore	4.5 ftrising	E 0.7 ft @ 4s
10 PM	E 0.9 ktonshore	4.5 ftrising	E 0.7 ft @ 4s
11 PM	E 0.7 ktcross-shore	5 ftrising	E 0.7 ft @ 4s

12 AMUnavailable

WindNNW 4.2 ktoffshoreTide5 ftnear highOffshore swellESE 1.2 ft @ 3s

1 AMUnavailable

WindNNW 3.1 ktoffshoreTide5 ftfallingOffshore swellESE 1.2 ft @ 3s

2 AMUnavailable

WindNNW 3.3 ktoffshoreTide4.5 ftfallingOffshore swellESE 1.2 ft @ 3s

3 AMUnavailable

WindNNW 3 ktoffshoreTide4 ftfallingOffshore swellESE 1.2 ft @ 3s

4 AMUnavailable

WindNW 2.5 ktoffshoreTide4 ftfallingOffshore swellESE 1.2 ft @ 3s

5 AMUnavailable

WindNNW 2.8 ktoffshoreTide3.5 ftfallingOffshore swellESE 1.2 ft @ 3s

6 AMUnavailable

WindNNW 2.1 ktoffshoreTide3 ftfallingOffshore swellESE 1.1 ft @ 3s

7 AMUnavailable

WindN 3.5 ktoffshoreTide3 ftrisingOffshore swellE 1.0 ft @ 3s

8 AMUnavailable

WindNNE 3.8 ktcross-shoreTide3 ftrisingOffshore swellE 0.9 ft @ 3s

9 AMUnavailable

WindNE 4.2 ktcross-shoreTide3.5 ftrisingOffshore swellE 0.8 ft @ 3s

10 AMUnavailable

WindNE 3.9 ktcross-shoreTide4 ftrisingOffshore swellE 0.8 ft @ 4s

11 AMUnavailable

WindE 4.9 ktcross-shoreTide4 ftrisingOffshore swellE 0.7 ft @ 4s

NoonUnavailable

WindE 6 ktonshoreTide4.5 ftrisingOffshore swellE 0.7 ft @ 4s

1 PMUnavailable

WindESE 5.9 ktonshoreTide4.5 ftnear highOffshore swellE 0.7 ft @ 4s

2 PMUnavailable

WindESE 6 ktonshoreTide4.5 ftfallingOffshore swellE 0.7 ft @ 4s

3 PMUnavailable

WindESE 6 ktonshoreTide4.5 ftfallingOffshore swellE 0.7 ft @ 3s

4 PMUnavailable

WindESE 6.1 ktonshoreTide4 ftfallingOffshore swellE 0.7 ft @ 3s

5 PMUnavailable

WindESE 6 ktonshoreTide4 ftfallingOffshore swellE 0.7 ft @ 4s

6 PMUnavailable

WindE 3.7 ktonshoreTide3.5 ftnear lowOffshore swellE 0.7 ft @ 4s

7 PMUnavailable

WindE 2.2 ktcross-shoreTide3.5 ftrisingOffshore swellE 0.7 ft @ 4s

8 PMUnavailable

WindSE 2.2 ktonshoreTide4 ftrisingOffshore swellE 0.7 ft @ 4s

9 PMUnavailable

WindESE 0.8 ktonshoreTide4.5 ftrisingOffshore swellE 0.7 ft @ 4s

10 PMUnavailable

WindE 0.9 ktonshoreTide4.5 ftrisingOffshore swellE 0.7 ft @ 4s

11 PMUnavailable

WindE 0.7 ktcross-shoreTide5 ftrisingOffshore swellE 0.7 ft @ 4s

Tide

South China Sea Forecast Center Wuchang (乌场) · 33.9 km from Riyue Bay · station-relative local gauge datum

Interpolated tide height Recommended window

About this spot

Model-grid forecast requested at the mapped coordinate; reef, headland, and nearshore transformations are unresolved. Point break. Named surf-beach centroid within the mapped Riyue Bay beach; southeast-facing curved point and beach exposure.

Mapped spot coordinate: 18.6297, 110.2149.

Hainan Island · Hainan Island east-southeast coast at Wanning, South China Sea · Ocean-facing bearing 135° · Location provenance

Model request point: Riyue Bay (18.6297, 110.2149). Model output times describe valid conditions; the provider does not expose the model run issue time in this response.

Forecast sources

Data coverage 4/7 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 D · MODEL_FIRST_ASIA · spot-level model point

Hainan Meteorological Observatory · 本岛东部
Hainan Meteorological Observatory · 本岛东部; Official named-zone marine weather. This zone row supplies no wave height and is not a surf forecast.CurrentSep 23, 7:00 AM GMT+8
The Buoy API
The Buoy API covers parts of western Europe and has no China network; no public same-exposure Hainan wave observation with verified identity and timestamp is connected.UnavailableNo source time
South China Sea Forecast Center tide predictions
South China Sea Forecast Center Wuchang (乌场) · 33.9 km from Riyue Bay; predicted high/low events above station-relative local gauge datum, converted to feet. Timestamp is retrieval time; provider issue time is not supplied.CurrentSep 23, 8:19 AM GMT+8
WorldTides API
WorldTides requires a credential; the official Wuchang and Sanya predictions are used instead.UnavailableNo source time
Open-Meteo Marine API
1 of 1 configured model points availableCurrentSep 23, 7:30 AM GMT+8
Open-Meteo Weather API
1 of 1 configured model points availableCurrentSep 23, 7:30 AM GMT+8
Copernicus Marine Global Ocean Waves
Copernicus Marine requires an account/toolbox workflow and no independently connected response is available.UnavailableNo source time
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.