
Surf Forecasts:
Secret Harbour surf forecast from 5 Aug 2026:
- Best quality surf: Sunday 9 Aug, 2AM (local time) - 15ft (4.5m), 18s period, WSW swell with cross-shore winds.
- Most powerful swell: Saturday 8 Aug, 8PM (local time) - 16ft (5.0m), 17s period, WSW swell with 13,897 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 2AM (local time) - 10ft (3.0m), 16s 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 Thursday (Aug 06) at 2AM. The primary swell is predicted to be 3.0m and 16s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Secret Harbour in the next 16 days are 5.0m 17s and forecast to arrive on Saturday (Aug 08) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Thu 6th Aug) | 10ft (3.0m) 16s |
| Best Surf | 2AM (Sun 9th Aug) | 15ft (4.5m) 18s |
| Most Powerful | 8PM (Sat 8th Aug) | 16ft (5.0m) 17s |
Table - best surf conditions forecast for Secret Harbour over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at what's coming down the line for our stretch of coast. We're focusing on one spot, Secret Harbour, and the next couple of weeks have a bit of a split personality. We'll see some absolute monsters rolling in, but the wind's gonna be the main character for a while before we get our reward.
The first real chance to paddle out doesn't come until Sunday the 9th. The early part of the week, from the 6th to the 8th, is a write-off. We've got strong onshore winds and solid, powerful groundswell, but it's all just blown-out chop and closeouts. The energy is massive – we're talking up to 12473 on the combined swell energy on Saturday the 8th – but with that near gale-force wind, it's just not surfable. That one's for the tow crew or the kites only, honestly.
Now, here's where it gets interesting. Sunday morning the 9th is our first standout. We've got a clean 10ft of groundswell from the WSW (good direction for the break), a light breeze coming offshore, and conditions are described as clean. The energy is still strong at 6776, but the wind makes it all come together. This is exceptional for experts, but keep in mind the swell size means it's for experienced surfers only. It's not a beginner's day. The water temp is about what you'd expect for this time of year.
The next real highlight is Thursday the 13th. Another morning with a clean 10ft swell from the WSW, this time with a very long 19-second period and light offshore winds. That’s a proper groundswell with some serious push and long lulls between sets. The combined energy is a meaty 5992. Again, this is exceptional for experts, but that long period could make it a bit tricky if it's closing out – it'll be best if it's lining up. Keep that date circled.
There are a couple of other decent mornings for experienced surfers, like Wednesday the 12th with a smaller 7ft swell and clean conditions, and again on Friday the 14th with the same size. These are good, solid days for a session without the massive size.
After that, we taper off into smaller but still clean waves around the 16th and 17th, and then another pulse of bigger, stronger swell hits around Monday the 17th and Tuesday the 18th, but the onshore wind comes back with it, spoiling the party. It looks like we get another clean, smaller window on Wednesday the 19th, and a final run of clean small waves on Friday the 21st of August. All in all, the biggest, cleanest days are that Sunday the 9th and Thursday the 13th. Don't sleep on 'em.
Rusty.
Short Range ForecastHeavy rain (total 21mm), heaviest during Thu night. Very mild (max 17°C on Wed night, min 12°C on Fri night). Winds increasing (calm on Wed night, near gales from the WSW by Fri night). | Days 5-7 Weather SummaryModerate rain (total 15mm), heaviest on Sun night. Very mild (max 17°C on Sun night, min 11°C on Sat night). Winds increasing (light winds from the ENE on Sun morning, strong winds from the SW by Mon night). | ||||||||||||||||||
Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | ||||||||||||||
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 16 | WSW 16 | W 16 | WSW 16 | WSW 15 | WSW 15 | WSW 15 | WSW 15 | WSW 17 | WSW 18 | WSW 17 | WSW 16 | WSW 15 | WSW 9 | WSW 12 | WSW 18 | WSW 16 | WSW 16 | WSW 15 |
Wave Graph | |||||||||||||||||||
4580 | 3937 | 3563 | 3857 | 3791 | 4131 | 6309 | 8305 | 12473 | 12040 | 6776 | 4342 | 2846 | 2513 | 5277 | 13198 | 7217 | 4709 | 2860 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-on | cross-on | cross-on | on | cross-on | on | on | cross-on | cross | cross-off | cross-on | on | cross-on | on | cross-on | cross | cross-on | cross-off |
High Tide | 2:25AM0.87m | 3:33AM0.90m | 4:56AM0.92m | 6:19AM0.95m | 7:30AM0.98m | 8:28AM0.99m | |||||||||||||
Low Tide | 3:44PM0.43m | 3:29PM0.34m | 3:50PM0.27m | 4:18PM0.23m | 4:49PM0.24m | 5:17PM0.28m | |||||||||||||
— | 7:03 | — | — | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:58 | — | — | |
5:42 | — | 5:43 | — | — | 5:43 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — | — | 5:45 | — | |
mm | — | — | — | 8 | 1 | — | 6 | 4 | 2 | 1 | — | 2 | 4 | 4 | — | 4 | — | — | — |
Temp °C | 17 | 17 | 17 | 17 | 15 | 15 | 16 | 12 | 13 | 12 | 13 | 16 | 17 | 15 | 14 | 14 | 13 | 15 | 15 |
Feels °C | 16 | 12 | 12 | 12 | 10 | 9 | 8 | 2 | 2 | 5 | 10 | 11 | 11 | 7 | 6 | 5 | 7 | 10 | 11 |
Swell 1 Height (m) Direction Period (s) | WSW 16 | WSW 16 | W 16 | WSW 16 | WSW 15 | — | — | NW 13 | — | WSW 18 | WSW 17 | WSW 16 | WSW 19 | — | — | WSW 18 | WSW 16 | WSW 16 | WSW 15 |
4580 | 3937 | 3563 | 3857 | 3791 | — | — | 7 | — | 12040 | 6776 | 4342 | 621 | — | — | 13198 | 7217 | 4709 | 2860 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | W 22 | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | 236 | — | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | WSW 15 | WSW 15 | WSW 15 | WSW 17 | — | — | — | WSW 15 | WSW 9 | WSW 12 | — | — | — | — |
— | — | — | — | — | 4131 | 6309 | 8305 | 12473 | — | — | — | 2846 | 2513 | 5277 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 314 | 369 | 177 | 307 | 369 | 1980 | 1742 | 1971 | 2008 | 0 | 369 | 369 | 984 | 2135 | 2133 | 101 | 143 | 0 |
Best forecast wave conditions in Perth City Coast | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
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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.











