Sydney Northern Beaches · Today

Dee Why

Updated Wed, Sep 23, 9:40 AM GMT+10

When to go

9:42 AM–11:00 AM

Looks good · Low confidence

3.7–3.7 ft · Offshore waves · not face height

Wind: 4.6 kt · cross-shore

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.

10:00 AM–12:00 PM · Australia/Sydney
Light wind · up to 5.0 kt · reported gusts up to 14.4 kt
Offshore waves: 3.7–3.7 ft across the period. Surf height unavailable. Tide data unavailable.
Wind source time: Sep 23, 9:30 AM GMT+10. 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 3.9 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 3.1 kt

Tide Unavailable

Wave, wind and tide details

Offshore model swellE 2.9 ft @ 5sValid 2026-09-23 10:00 · Australia/SydneyMarine grid -33.7917, 151.2917 · offshore model, not a local measurement

Offshore model sea3.7 ft @ 8.4sSignificant wave height including wind waves and swell; not breaking surfValid 2026-09-23 10:00 · Australia/Sydney

Model windSE 3.1 ktcross-shoreValid 2026-09-23 10:00 · Australia/Sydney1.2 kt onshore 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 Dee Why
Time	Wind	Tide	Offshore swell
12 AM	NE 4.3 ktonshore	Unavailableunavailable	E 3.1 ft @ 5s
1 AM	N 2.8 ktcross-shore	Unavailableunavailable	E 3.2 ft @ 5s
2 AM	NNW 1.8 ktcross-shore	Unavailableunavailable	E 3.3 ft @ 5s
3 AM	W 0.8 ktoffshore	Unavailableunavailable	E 3.3 ft @ 5s
4 AM	WSW 1.3 ktoffshore	Unavailableunavailable	ESE 3.4 ft @ 5s
5 AM	WSW 2.6 ktoffshore	Unavailableunavailable	ESE 3.3 ft @ 5s
6 AM	WSW 4.1 ktoffshore	Unavailableunavailable	ESE 3.1 ft @ 5s
7 AM	WSW 4.4 ktoffshore	Unavailableunavailable	ESE 3.0 ft @ 5s
8 AM	SW 3.2 ktoffshore	Unavailableunavailable	E 3.0 ft @ 5s
9 AM	S 2.9 ktcross-shore	Unavailableunavailable	E 3.0 ft @ 5s
10 AM	SE 3.1 ktcross-shore	Unavailableunavailable	E 2.9 ft @ 5s
11 AM	ESE 4.6 ktcross-shore	Unavailableunavailable	E 2.8 ft @ 5s
Noon	ESE 5 ktcross-shore	Unavailableunavailable	E 2.8 ft @ 5s
1 PM	ESE 5.1 ktonshore	Unavailableunavailable	E 2.8 ft @ 5s
2 PM	ESE 5.4 ktonshore	Unavailableunavailable	E 2.8 ft @ 5s
3 PM	ENE 5.9 ktonshore	Unavailableunavailable	E 2.8 ft @ 6s
4 PM	NE 9.4 ktonshore	Unavailableunavailable	E 2.9 ft @ 6s
5 PM	NE 9.5 ktonshore	Unavailableunavailable	E 3.0 ft @ 6s
6 PM	NE 10.1 ktonshore	Unavailableunavailable	E 3.0 ft @ 5s
7 PM	NE 10.1 ktonshore	Unavailableunavailable	ENE 3.0 ft @ 5s
8 PM	NNE 10.5 ktonshore	Unavailableunavailable	ENE 3.1 ft @ 5s
9 PM	NNE 9.6 ktonshore	Unavailableunavailable	ENE 3.2 ft @ 5s
10 PM	NNE 8.6 ktcross-shore	Unavailableunavailable	ENE 3.3 ft @ 5s
11 PM	NNE 7.9 ktcross-shore	Unavailableunavailable	ENE 3.3 ft @ 5s

12 AMUnavailable

WindNE 4.3 ktonshoreTideUnavailableunavailableOffshore swellE 3.1 ft @ 5s

1 AMUnavailable

WindN 2.8 ktcross-shoreTideUnavailableunavailableOffshore swellE 3.2 ft @ 5s

2 AMUnavailable

WindNNW 1.8 ktcross-shoreTideUnavailableunavailableOffshore swellE 3.3 ft @ 5s

3 AMUnavailable

WindW 0.8 ktoffshoreTideUnavailableunavailableOffshore swellE 3.3 ft @ 5s

4 AMUnavailable

WindWSW 1.3 ktoffshoreTideUnavailableunavailableOffshore swellESE 3.4 ft @ 5s

5 AMUnavailable

WindWSW 2.6 ktoffshoreTideUnavailableunavailableOffshore swellESE 3.3 ft @ 5s

6 AMUnavailable

WindWSW 4.1 ktoffshoreTideUnavailableunavailableOffshore swellESE 3.1 ft @ 5s

7 AMUnavailable

WindWSW 4.4 ktoffshoreTideUnavailableunavailableOffshore swellESE 3.0 ft @ 5s

8 AMUnavailable

WindSW 3.2 ktoffshoreTideUnavailableunavailableOffshore swellE 3.0 ft @ 5s

9 AMUnavailable

WindS 2.9 ktcross-shoreTideUnavailableunavailableOffshore swellE 3.0 ft @ 5s

10 AMUnavailable

WindSE 3.1 ktcross-shoreTideUnavailableunavailableOffshore swellE 2.9 ft @ 5s

11 AMUnavailable

WindESE 4.6 ktcross-shoreTideUnavailableunavailableOffshore swellE 2.8 ft @ 5s

NoonUnavailable

WindESE 5 ktcross-shoreTideUnavailableunavailableOffshore swellE 2.8 ft @ 5s

1 PMUnavailable

WindESE 5.1 ktonshoreTideUnavailableunavailableOffshore swellE 2.8 ft @ 5s

2 PMUnavailable

WindESE 5.4 ktonshoreTideUnavailableunavailableOffshore swellE 2.8 ft @ 5s

3 PMUnavailable

WindENE 5.9 ktonshoreTideUnavailableunavailableOffshore swellE 2.8 ft @ 6s

4 PMUnavailable

WindNE 9.4 ktonshoreTideUnavailableunavailableOffshore swellE 2.9 ft @ 6s

5 PMUnavailable

WindNE 9.5 ktonshoreTideUnavailableunavailableOffshore swellE 3.0 ft @ 6s

6 PMUnavailable

WindNE 10.1 ktonshoreTideUnavailableunavailableOffshore swellE 3.0 ft @ 5s

7 PMUnavailable

WindNE 10.1 ktonshoreTideUnavailableunavailableOffshore swellENE 3.0 ft @ 5s

8 PMUnavailable

WindNNE 10.5 ktonshoreTideUnavailableunavailableOffshore swellENE 3.1 ft @ 5s

9 PMUnavailable

WindNNE 9.6 ktonshoreTideUnavailableunavailableOffshore swellENE 3.2 ft @ 5s

10 PMUnavailable

WindNNE 8.6 ktcross-shoreTideUnavailableunavailableOffshore swellENE 3.3 ft @ 5s

11 PMUnavailable

WindNNE 7.9 ktcross-shoreTideUnavailableunavailableOffshore swellENE 3.3 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. Point break. Published named-break coordinate; the source describes a fairly exposed point with south swell and south offshore-wind exposure. This is mainland Australia's Sydney Northern Beaches coast.

Mapped spot coordinate: -33.7599, 151.3101.

Mainland · Sydney east-northeast-facing fairly exposed point coast · Ocean-facing bearing 67.5° · Location provenance

Model request point: Dee Why (-33.7599, 151.3101). 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 B · AU_NSW · spot-level model point

Australian Bureau of Meteorology Marine Forecasts/AUSWAVE
BOM publishes Sydney Coast waters from Broken Bay to Port Hacking, but blocks application access; no forecast is scraped or presented as break-level surf.UnavailableNo source time
NSW Manly Hydraulics Laboratory Wave Data
NSW Manly Hydraulics Laboratory wave and tide access returned an explicit location restriction for non-Australian visitors; no station response, observation, or tide value is substituted.UnavailableNo source time
Australian Ocean Data Network / IMOS
AusWaves identifies NSW Waves as an official live network, but its buoy-list endpoint returned HTTP 401 with an empty response; no station identity, coordinates, timestamp, units, cadence, distance, or exposure could be validated for assignment.UnavailableNo source time
WorldTides API
No tide prediction with verified station identity, distance, datum, timezone, and current response is connected.UnavailableNo source time
Open-Meteo Marine API
1 of 1 configured model points availableCurrentSep 23, 9:30 AM GMT+10
Open-Meteo Weather API
1 of 1 configured model points availableCurrentSep 23, 9:30 AM GMT+10
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.