Mentawai Islands · Today

Rifles

Updated Wed, Sep 23, 6:40 AM GMT+7

When to go

11:00 AM–12:00 PM

Windy · Low confidence

6.1–6.1 ft · Offshore waves · not face height

Wind: 11.5 kt · cross-shore

Forecast details

This is the best time in the forecast, though wind may make it choppy.

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.

10:00 AM–12:00 PM · Asia/Jakarta
Unfavorable wind · up to 11.5 kt · reported gusts up to 16.7 kt
Caution: This is the best available wind comparison, not a favorable-wind label. The selected wind is unfavorable for this break.
Offshore waves: 6.0–6.1 ft across the period. Surf height unavailable. Tide data unavailable.
Wind source time: Sep 23, 6:30 AM GMT+7. 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 5.3 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 SE 13.1 kt

Tide Unavailable

Wave, wind and tide details

Offshore model swellSSW 4.5 ft @ 13sValid 2026-09-23 07:00 · Asia/JakartaMarine grid -1.9583, 99.2917 · offshore model, not a local measurement

Offshore model sea5.9 ft @ 12.3sSignificant wave height including wind waves and swell; not breaking surfValid 2026-09-23 07:00 · Asia/Jakarta

Model windSE 13.1 ktcross-shoreValid 2026-09-23 07:00 · Asia/Jakarta0.7 kt offshore component

TideUnavailableunavailableNo verified local tide station connected; no tide height estimated

BMKG Samudra Hindia barat Kep. Mentawai7.9–8.9 ftBMKG offshore significant wave height; not breaking surfIssued Sep 22, 7:00 PM GMT+7

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 Rifles
Time	Wind	Tide	Offshore swell
12 AM	SE 10.9 ktcross-shore	Unavailableunavailable	SSW 3.9 ft @ 13s
1 AM	SE 11.4 ktcross-shore	Unavailableunavailable	SSW 4.5 ft @ 13s
2 AM	SE 11.2 ktcross-shore	Unavailableunavailable	SSW 4.5 ft @ 12s
3 AM	SE 11.4 ktcross-shore	Unavailableunavailable	SSW 4.5 ft @ 13s
4 AM	SE 12.2 ktcross-shore	Unavailableunavailable	SSW 4.5 ft @ 13s
5 AM	SE 12.8 ktcross-shore	Unavailableunavailable	SSW 4.5 ft @ 13s
6 AM	SE 12.8 ktcross-shore	Unavailableunavailable	SSW 4.5 ft @ 13s
7 AM	SE 13.1 ktcross-shore	Unavailableunavailable	SSW 4.5 ft @ 13s
8 AM	SE 13.5 ktcross-shore	Unavailableunavailable	SSW 4.5 ft @ 13s
9 AM	SE 12.8 ktcross-shore	Unavailableunavailable	SSW 4.5 ft @ 13s
10 AM	SE 10.9 ktcross-shore	Unavailableunavailable	SSW 4.6 ft @ 13s
11 AM	SE 10.4 ktcross-shore	Unavailableunavailable	SSW 4.7 ft @ 13s
Noon	SSE 11.5 ktcross-shore	Unavailableunavailable	SSW 4.7 ft @ 13s
1 PM	SSE 12.3 ktcross-shore	Unavailableunavailable	SSW 4.7 ft @ 13s
2 PM	SSE 13.6 ktcross-shore	Unavailableunavailable	SSW 4.7 ft @ 13s
3 PM	SSE 14.7 ktcross-shore	Unavailableunavailable	SSW 4.8 ft @ 13s
4 PM	SSE 15.7 ktcross-shore	Unavailableunavailable	SSW 4.8 ft @ 13s
5 PM	SSE 15.2 ktcross-shore	Unavailableunavailable	SSW 4.8 ft @ 13s
6 PM	SSE 14.8 ktcross-shore	Unavailableunavailable	SSW 4.8 ft @ 13s
7 PM	SSE 13.9 ktcross-shore	Unavailableunavailable	SSW 4.8 ft @ 13s
8 PM	SSE 12.9 ktcross-shore	Unavailableunavailable	SSW 4.8 ft @ 13s
9 PM	SSE 13.6 ktcross-shore	Unavailableunavailable	SSW 4.8 ft @ 12s
10 PM	SE 14.5 ktcross-shore	Unavailableunavailable	SSW 4.8 ft @ 12s
11 PM	SE 13.7 ktcross-shore	Unavailableunavailable	SSW 4.8 ft @ 12s

12 AMUnavailable

WindSE 10.9 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 3.9 ft @ 13s

1 AMUnavailable

WindSE 11.4 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.5 ft @ 13s

2 AMUnavailable

WindSE 11.2 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.5 ft @ 12s

3 AMUnavailable

WindSE 11.4 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.5 ft @ 13s

4 AMUnavailable

WindSE 12.2 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.5 ft @ 13s

5 AMUnavailable

WindSE 12.8 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.5 ft @ 13s

6 AMUnavailable

WindSE 12.8 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.5 ft @ 13s

7 AMUnavailable

WindSE 13.1 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.5 ft @ 13s

8 AMUnavailable

WindSE 13.5 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.5 ft @ 13s

9 AMUnavailable

WindSE 12.8 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.5 ft @ 13s

10 AMUnavailable

WindSE 10.9 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.6 ft @ 13s

11 AMUnavailable

WindSE 10.4 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.7 ft @ 13s

NoonUnavailable

WindSSE 11.5 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.7 ft @ 13s

1 PMUnavailable

WindSSE 12.3 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.7 ft @ 13s

2 PMUnavailable

WindSSE 13.6 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.7 ft @ 13s

3 PMUnavailable

WindSSE 14.7 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.8 ft @ 13s

4 PMUnavailable

WindSSE 15.7 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.8 ft @ 13s

5 PMUnavailable

WindSSE 15.2 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.8 ft @ 13s

6 PMUnavailable

WindSSE 14.8 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.8 ft @ 13s

7 PMUnavailable

WindSSE 13.9 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.8 ft @ 13s

8 PMUnavailable

WindSSE 12.9 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.8 ft @ 13s

9 PMUnavailable

WindSSE 13.6 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.8 ft @ 12s

10 PMUnavailable

WindSE 14.5 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.8 ft @ 12s

11 PMUnavailable

WindSE 13.7 ktcross-shoreTideUnavailableunavailableOffshore swellSSW 4.8 ft @ 12s

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. Named-break coordinate and ocean-facing orientation reviewed for BMKG west Mentawai offshore-area assignment.

Mapped spot coordinate: -1.92, 99.32.

Mentawai Islands · Indian Ocean coast of the Mentawai archipelago · Ocean-facing bearing 225° · Location provenance

Model request point: Rifles (-1.92, 99.32). Model output times describe valid conditions; the provider does not expose the model run issue time in this response.

Forecast sources

Data coverage 3/6 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 C · INDONESIA · spot-level model point

BMKG Samudra Hindia barat Kep. Mentawai
BMKG Samudra Hindia barat Kep. Mentawai; BMKG offshore significant wave height; not breaking surfCurrentSep 22, 7:00 PM GMT+7
The Buoy API
Normalized nearest-buoy discovery and readings; 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, 6:30 AM GMT+7
Open-Meteo Weather API
1 of 1 configured model points availableCurrentSep 23, 6:30 AM GMT+7
Copernicus Marine Global Ocean Waves
Independent wave-model backend and cross-check; market adapter or station mapping not connectedUnavailableNo 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.