Tongatapu · Thursday, Sep 24

Corners Tonga

Updated Wed, Sep 23, 1:10 PM GMT+13

When to go

10:00 AM–12:00 PM

Looks good · Low confidence

5.8–6.0 ft · Offshore waves · not face height

Wind: 9.3 kt · offshore

Forecast details

Wind blowing out to sea should help the waves stay clean.

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.

8:00 AM–10:00 AM · Pacific/Tongatapu
Moderate offshore wind · up to 8.6 kt · reported gusts up to 12.8 kt
Offshore waves: 6.0–6.2 ft across the period. Surf height unavailable. Tide data unavailable.
Wind source time: Sep 23, 12:30 PM GMT+13. 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 4.3 km from the mapped spot. Provider grid resolution is not established for this response.
Reference model hour: 19 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 SE 8.6 kt

Tide Unavailable

Wave, wind and tide details

Offshore model swellS 4.4 ft @ 8sValid 2026-09-24 08:00 · Pacific/TongatapuMarine grid -21.0417, -175.3750 · offshore model, not a local measurement

Offshore model sea6.2 ft @ 10.6sSignificant wave height including wind waves and swell; not breaking surfValid 2026-09-24 08:00 · Pacific/Tongatapu

Model windSE 8.6 ktoffshoreValid 2026-09-24 08:00 · Pacific/Tongatapu8.4 kt offshore component

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 Corners Tonga
Time	Wind	Tide	Offshore swell
12 AM	SE 7.6 ktoffshore	Unavailableunavailable	S 5.1 ft @ 9s
1 AM	SE 7.5 ktoffshore	Unavailableunavailable	S 4.9 ft @ 9s
2 AM	SE 7.5 ktoffshore	Unavailableunavailable	S 4.9 ft @ 9s
3 AM	SE 7.5 ktoffshore	Unavailableunavailable	S 4.7 ft @ 9s
4 AM	SE 7.6 ktoffshore	Unavailableunavailable	S 4.7 ft @ 9s
5 AM	SE 7.5 ktoffshore	Unavailableunavailable	S 4.6 ft @ 9s
6 AM	SE 8.3 ktoffshore	Unavailableunavailable	S 4.5 ft @ 9s
7 AM	SE 9 ktoffshore	Unavailableunavailable	S 4.5 ft @ 9s
8 AM	SE 8.6 ktoffshore	Unavailableunavailable	S 4.4 ft @ 8s
9 AM	SSE 8.4 ktoffshore	Unavailableunavailable	S 4.4 ft @ 8s
10 AM	SSE 8.3 ktoffshore	Unavailableunavailable	S 4.3 ft @ 8s
11 AM	SSE 9 ktoffshore	Unavailableunavailable	S 4.3 ft @ 8s
Noon	SSE 9.3 ktoffshore	Unavailableunavailable	S 4.3 ft @ 8s
1 PM	S 9.7 ktoffshore	Unavailableunavailable	S 4.2 ft @ 8s
2 PM	S 11.7 ktoffshore	Unavailableunavailable	S 4.1 ft @ 8s
3 PM	S 11 ktoffshore	Unavailableunavailable	S 4.0 ft @ 8s
4 PM	S 9 ktoffshore	Unavailableunavailable	S 3.9 ft @ 8s
5 PM	SSE 10 ktoffshore	Unavailableunavailable	S 3.9 ft @ 8s
6 PM	SSE 8.7 ktoffshore	Unavailableunavailable	S 3.8 ft @ 8s
7 PM	SSE 9.3 ktoffshore	Unavailableunavailable	S 3.7 ft @ 8s
8 PM	SSE 10.6 ktoffshore	Unavailableunavailable	S 3.7 ft @ 8s
9 PM	SSE 10.4 ktoffshore	Unavailableunavailable	S 3.7 ft @ 8s
10 PM	SSE 8.9 ktoffshore	Unavailableunavailable	S 3.6 ft @ 8s
11 PM	SE 8.3 ktoffshore	Unavailableunavailable	S 3.5 ft @ 8s

12 AMUnavailable

WindSE 7.6 ktoffshoreTideUnavailableunavailableOffshore swellS 5.1 ft @ 9s

1 AMUnavailable

WindSE 7.5 ktoffshoreTideUnavailableunavailableOffshore swellS 4.9 ft @ 9s

2 AMUnavailable

WindSE 7.5 ktoffshoreTideUnavailableunavailableOffshore swellS 4.9 ft @ 9s

3 AMUnavailable

WindSE 7.5 ktoffshoreTideUnavailableunavailableOffshore swellS 4.7 ft @ 9s

4 AMUnavailable

WindSE 7.6 ktoffshoreTideUnavailableunavailableOffshore swellS 4.7 ft @ 9s

5 AMUnavailable

WindSE 7.5 ktoffshoreTideUnavailableunavailableOffshore swellS 4.6 ft @ 9s

6 AMUnavailable

WindSE 8.3 ktoffshoreTideUnavailableunavailableOffshore swellS 4.5 ft @ 9s

7 AMUnavailable

WindSE 9 ktoffshoreTideUnavailableunavailableOffshore swellS 4.5 ft @ 9s

8 AMUnavailable

WindSE 8.6 ktoffshoreTideUnavailableunavailableOffshore swellS 4.4 ft @ 8s

9 AMUnavailable

WindSSE 8.4 ktoffshoreTideUnavailableunavailableOffshore swellS 4.4 ft @ 8s

10 AMUnavailable

WindSSE 8.3 ktoffshoreTideUnavailableunavailableOffshore swellS 4.3 ft @ 8s

11 AMUnavailable

WindSSE 9 ktoffshoreTideUnavailableunavailableOffshore swellS 4.3 ft @ 8s

NoonUnavailable

WindSSE 9.3 ktoffshoreTideUnavailableunavailableOffshore swellS 4.3 ft @ 8s

1 PMUnavailable

WindS 9.7 ktoffshoreTideUnavailableunavailableOffshore swellS 4.2 ft @ 8s

2 PMUnavailable

WindS 11.7 ktoffshoreTideUnavailableunavailableOffshore swellS 4.1 ft @ 8s

3 PMUnavailable

WindS 11 ktoffshoreTideUnavailableunavailableOffshore swellS 4.0 ft @ 8s

4 PMUnavailable

WindS 9 ktoffshoreTideUnavailableunavailableOffshore swellS 3.9 ft @ 8s

5 PMUnavailable

WindSSE 10 ktoffshoreTideUnavailableunavailableOffshore swellS 3.9 ft @ 8s

6 PMUnavailable

WindSSE 8.7 ktoffshoreTideUnavailableunavailableOffshore swellS 3.8 ft @ 8s

7 PMUnavailable

WindSSE 9.3 ktoffshoreTideUnavailableunavailableOffshore swellS 3.7 ft @ 8s

8 PMUnavailable

WindSSE 10.6 ktoffshoreTideUnavailableunavailableOffshore swellS 3.7 ft @ 8s

9 PMUnavailable

WindSSE 10.4 ktoffshoreTideUnavailableunavailableOffshore swellS 3.7 ft @ 8s

10 PMUnavailable

WindSSE 8.9 ktoffshoreTideUnavailableunavailableOffshore swellS 3.6 ft @ 8s

11 PMUnavailable

WindSE 8.3 ktoffshoreTideUnavailableunavailableOffshore swellS 3.5 ft @ 8s

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. Reef break. Published named-break coordinate and outer-reef exposure, corroborated by the local Ha'atafu surf operator; not a surveyed lineup.

Mapped spot coordinate: -21.0706, -175.3471.

Tongatapu · Tongatapu northwest outer reef coast · Ocean-facing bearing 315° · Location provenance

Model request point: Corners Tonga (-21.0706, -175.3471). Model output times describe valid conditions; the provider does not expose the model run issue time in this response.

Forecast sources

Data coverage 2/6 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 · PACIFIC_MODEL · spot-level model point

National or regional meteorological marine bulletin
No current Tonga Met bulletin passed issuer, local issue/validity time, exact coastal-waters scope, knots, metres, and content validation.UnavailableNo source time
The Buoy API
No independently contracted Tongatapu wave observation is connected; bulletin sea state is never presented as an observation or breaking surf.UnavailableNo source time
WorldTides API
Tonga Met's bulletin tide text is not ingested without an independently contracted station identity, datum, timezone, and prediction schema.UnavailableNo source time
Open-Meteo Marine API
1 of 1 configured model points availableCurrentSep 23, 12:30 PM GMT+13
Open-Meteo Weather API
1 of 1 configured model points availableCurrentSep 23, 12:30 PM GMT+13
Copernicus Marine Global Ocean Waves
No independently authenticated Copernicus product, run, grid, and current response is connected for Tongatapu; the official coastal bulletin and Open-Meteo remain separately labeled forecast evidence.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.