Surf Forecasts:
Secret Harbour surf forecast from 15 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 11AM (local time) - 11ft (3.5m), 16s period, W swell with glassy winds.
- Most powerful swell: Monday 17 Aug, 5PM (local time) - 11ft (3.5m), 17s period, WSW swell with 7,159 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 11AM (local time) - 5.5ft (1.7m), 14s period with WSW swell.
Best Forecast Surf Conditions for Secret Harbour this week:
The surf forecast for Secret Harbour over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 15) at 11AM. The primary swell is predicted to be 1.7m and 14s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Secret Harbour in the next 16 days are 3.5m 17s and forecast to arrive on Monday (Aug 17) at 5PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Monday (Aug 17) at 8AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Sat 15th Aug) | 5.5ft (1.7m) 14s |
| Best Surf | 11AM (Tue 18th Aug) | 11ft (3.5m) 16s |
| Most Powerful | 5PM (Mon 17th Aug) | 11ft (3.5m) 17s |
Table - best surf conditions forecast for Secret Harbour over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s cooking at Secret Harbour.
We’re kicking off on Saturday, 15th August. The water’s sitting at 63°, which is a bit colder than normal for this time of year, so you might want an extra mm of rubber. The swell energy is solid – moderate to strong at 1127 – and we’ve got a clean 6ft groundswell from the west-southwest, with a nice 14-second period. The wind is a gentle cross-off from the north-northeast, keeping things clean. This is a proper session for experienced surfers, with good shape and power. The best wave of the whole outlook? That’s going to be Thursday morning, 20th August. The wind goes glassy, near calm, with just a slight air from the north. The swell hangs in at 8ft from the west-southwest, period 16 seconds, and the energy is strong at 3299. For a sandbar, that’s a powerful, clean, long-period groundswell that’ll wrap in nicely. The crowd factor is listed as “sometimes,” so it’s not empty, but not a zoo either. After that, Friday morning 21st stays clean with a cross-off breeze and 7ft swell, and Saturday morning 22nd is glassy again with a 6ft swell. The second week gets a bit patchy. The standout there is Friday morning, 28th August – glassy wind, 6ft swell from the west with a very long 18-second period, and strong energy at 2092. That’s a promising window, but it’s over a week out, so keep an eye on it. The rest of the second week is mostly marginal with onshore winds and choppy conditions, especially around the 29th and 30th when the swell jumps up to 8ft and 10ft, but the wind is messy and cross-onshore. There’s a big gap in quality from the 23rd through to the 27th, so you’ll want to pick your windows carefully. Overall, the best bet is Thursday morning, 20th August – glassy, 8ft, 16-second groundswell, and strong energy. Get out there.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Mon afternoon. Warm (max 22°C on Sun afternoon, min 13°C on Sat morning). Winds increasing (light winds from the WNW on Sat afternoon, strong winds from the WSW by Mon afternoon). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Tue night. Very mild (max 16°C on Tue night, min 13°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | WSW 14 | WSW 14 | WSW 13 | WSW 15 | WSW 14 | W 19 | W 19 | WSW 17 | WSW 15 | W 16 | W 16 | W 16 | W 15 | WSW 15 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1127 | 1034 | 811 | 1581 | 1533 | 3007 | 2883 | 7159 | 5387 | 5409 | 5352 | 3555 | 2372 | 3225 | 4580 | 3639 | 2794 | 1928 | 1877 | 1667 | 1393 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | off | cross-off | cross-off | cross-off | cross | on | cross-on | glassy | cross-on | cross-on | cross-on | cross-on | cross-on | glassy | cross-on | cross-off | off | cross-on | off |
High Tide | 11:02AM0.79m | 11:58PM0.68m | 11:10AM0.70m | 00:07AM0.72m | 10:33AM0.62m | 00:27AM0.76m | 00:58AM0.78m | 1:41AM0.79m | 2:37AM0.79m | 3:48AM0.80m | |||||||||||
Low Tide | 5:41PM0.52m | 5:01AM0.57m | 5:10PM0.52m | 6:03AM0.58m | 4:42PM0.49m | 4:26PM0.43m | 4:21PM0.38m | 4:21PM0.34m | 4:16PM0.32m | ||||||||||||
 | |  | | | |  |  |  |  | | | | | | | | | | | | |
 | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — |
 | — | 5:47 | — | — | 5:49 | — | — | 5:50 | — | — | 5:50 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — |
mm | — | — | — | — | — | — | — | 4 | 1 | — | — | 1 | — | — | 2 | — | — | — | — | — | — |
Temp °C | 16 | 19 | 19 | 19 | 22 | 20 | 18 | 16 | 16 | 14 | 15 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 17 | 17 |
Feels °C | 13 | 17 | 16 | 13 | 16 | 15 | 13 | 10 | 8 | 12 | 11 | 11 | 13 | 12 | 13 | 14 | 13 | 12 | 13 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | WSW 14 | WSW 14 | WSW 13 | WSW 15 | WSW 14 | W 19 | W 19 | — | WSW 15 | W 16 | W 16 | W 16 | W 15 | WSW 15 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 14 | WSW 14 |
| kJ | 1127 | 1034 | 811 | 1581 | 1533 | 3007 | 2883 | — | 5387 | 5409 | 5352 | 3555 | 2372 | 3225 | 4580 | 3639 | 2794 | 1928 | 1877 | 1667 | 1393 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | W 20 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WSW 18 |
| kJ | — | — | — | — | — | 938 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 180 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNE 3 | — | — | N 5 | NNW 5 | N 5 | NW 5 | WSW 17 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 4 | — | — | 51 | 26 | 51 | 70 | 7159 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 44 | 0 | 282 | 167 | 167 | 1620 | 369 | 369 | 0 | 307 | 164 | 80 | 177 | 21 | 0 | 143 | 0 | 0 | 98 | 0 |
Best forecast wave conditions in Perth City Coast | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Secret Harbour surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Secret Harbour Surf forecast
The above surf forecast table for Secret Harbour provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Secret Harbour can be found by selecting the local surf guide option on the grey menu. Our Secret Harbour surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Secret Harbour) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Secret Harbour may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Secret Harbour is 13 km (8 miles) from Mandurah. If you plan a holiday in Perth City Coast, look for hotels and other accommodation in Mandurah. Mandurah has rooms for a wide range of budgets as well as car hire and transport links.
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