Surf Forecasts:
Secret Harbour surf forecast from 1 Sep 2026:
- Best quality surf: Monday 7 Sep, 2AM (local time) - 10ft (3.0m), 17s period, WSW swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 11PM (local time) - 11ft (3.5m), 18s period, WSW swell with 6,591 kJ wave energy.
- Next surfable swell (1★+): Wednesday 2 Sep, 11PM (local time) - 7ft (2.2m), 13s 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 Wednesday (Sep 02) at 11PM. The primary swell is predicted to be 2.2m and 13s 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 18s and forecast to arrive on Sunday (Sep 06) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 5s period and expected on Sunday (Sep 06) at 11AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Wed 2nd Sep) | 7ft (2.2m) 13s |
| Best Surf | 2AM (Mon 7th Sep) | 10ft (3.0m) 17s |
| Most Powerful | 11PM (Sun 6th Sep) | 11ft (3.5m) 18s |
Table - best surf conditions forecast for Secret Harbour over the next 16 days.
The Lowdown
G’day, I’m Rusty.
We’ve got a wild run ahead at Secret Harbour. The next day or so is a write-off—wind is on it, the swell is messy, and the scores are junk. Once the wind cleans up though, there are some solid windows of really good waves. The standout sessions land early in the second week, and then later on there’s a glassy dawn that looks proper.
Wednesday the 2nd and Thursday the 3rd are not worth suiting up for. Onshore wind, lumpy, choppy, poor quality. Friday the 4th has a big 10ft WSW swell rolling in but it’s onshore all morning and marginal at best in the arvo. Combined swell energy is pumping hard at 6974 and 4402, but that’s all just power with no shape. Saturday the 5th is another write-off with fresh cross-onshore winds and lumpy conditions. Sunday the 6th is messy too, though Monday the 7th morning shows a promising drop in wind with an 8ft WSW swell at a long 17 seconds, but it’s cross-shore with slight chop—marginal at best.
Now here’s where it gets good: Tuesday the 8th is the first real standout. Morning brings a 8ft WSW swell with a very long 17-second period, combined energy of 3128, and crucially the wind is a gentle cross-offshore breeze from the east, leaving the surf clean. It’s an advanced wave at that size, so not one for the groms. The 8ft option in the arvo is still decent but not as clean. Then Wednesday the 9th is pure gold. Morning surf is 6ft WSW with a 15-second period, gentle offshore from the ENE, and clean as a whistle. The afternoon though – 6ft, 14 seconds, and glassy calm, no wind at all. Combined energy sits at 1257 and conditions are pristine. That’s the session to circle.
After that, things fade. Thursday the 10th is small and windy, poor. Friday the 11th has a weird long-period 4ft WSW swell at 19 seconds with gentle cross-onshore wind, borderline. Saturday the 12th morning is a hidden gem: 8ft, 16-second WSW groundswell with glassy conditions and a calm sea. That’s the other standout for experienced surfers, combined energy at 2460, clean and powerful. Sunday the 13th morning is also clean with cross-offshore wind and 6ft, but the arvo turns to chop again.
From Monday the 14th onward it’s mostly onshore junk, although Tuesday the 15th morning has a light cross-shore 6ft swell that might offer a few rides, but the energy (1445) is moderate. By Wednesday the 16th and Thursday the 17th it’s back to poor or marginal conditions. Not much to get excited about in the last few days.
Overall, the best of the two-week window is Tuesday the 8th morning and Wednesday the 9th all day, with Saturday the 12th morning a solid runner-up. Crowds are sometimes an issue here, so with conditions like that you’ll want to be early.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Wed night. Very mild (max 17°C on Thu afternoon, min 14°C on Wed night). Winds increasing (calm on Wed night, strong winds from the W by Thu night). | Days 4-6 Weather SummaryModerate rain (total 12mm), heaviest on Sat night. Very mild (max 17°C on Sun afternoon, min 9°C on Mon morning). Winds decreasing (gales from the SSW on Sat night, light winds from the SE by Mon night). | ||||||||||||||||||||
Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | |||||||||||||||
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 13 | WSW 13 | WSW 15 | W 15 | W 14 | W 14 | WSW 15 | WSW 15 | W 14 | W 13 | WSW 12 | WSW 12 | WSW 13 | WSW 17 | WSW 17 | WSW 16 | WSW 16 | WSW 17 | WSW 16 | WSW 16 |
Wave Graph | |||||||||||||||||||||
1701 | 1534 | 1778 | 2289 | 2930 | 4110 | 3832 | 4402 | 3626 | 2898 | 3510 | 4616 | 3830 | 2930 | 5473 | 3459 | 2716 | 2080 | 3128 | 3011 | 2247 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | glassy | cross-on | cross-on | on | on | on | cross | cross-on | cross-on | cross | cross | cross-on | cross-off | cross | cross-on | cross-off | cross-off | cross | off |
High Tide | 11:55AM0.47m | 00:26AM0.84m | 1:21AM0.85m | 2:42AM0.84m | 4:34AM0.84m | 6:21AM0.85m | 7:37AM0.86m | 11:28PM0.55m | |||||||||||||
Low Tide | 9:00AM0.47m | 3:20PM0.46m | 1:54PM0.37m | 2:13PM0.29m | 2:43PM0.25m | 3:13PM0.23m | 3:40PM0.25m | 4:03PM0.29m | 00:54AM0.54m | ||||||||||||
6:33 | — | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — | 6:26 | — | — | 6:26 | — | — | |
— | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:02 | — | — | 6:04 | — | |
mm | — | 2 | 2 | — | 1 | 3 | — | — | — | 2 | 4 | 6 | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 16 | 15 | 16 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 12 | 13 | 17 | 14 | 13 | 17 | 17 | 15 | 20 | 19 |
Feels °C | 12 | 13 | 14 | 13 | 11 | 10 | 10 | 12 | 14 | 11 | 9 | -1 | 5 | 11 | 8 | 9 | 12 | 15 | 12 | 18 | 16 |
Swell 1 Height (m) Direction Period (s) | WSW 14 | WSW 13 | WSW 13 | WSW 15 | — | — | WSW 12 | WSW 15 | WSW 15 | — | — | W 23 | WSW 12 | WSW 13 | WSW 17 | WSW 17 | WSW 16 | WSW 16 | WSW 17 | WSW 16 | WSW 16 |
1701 | 1534 | 1778 | 2289 | — | — | 3142 | 4402 | 3626 | — | — | 10 | 3830 | 2930 | 5473 | 3459 | 2716 | 2080 | 3128 | 3011 | 2247 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | WSW 20 | WSW 18 | — | — | — | SSW 5 | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | 137 | 1143 | — | — | — | 22 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | W 15 | W 14 | W 14 | — | — | W 14 | W 13 | WSW 12 | SSE 5 | — | — | — | — | — | — | — | — |
— | — | — | — | 2930 | 4110 | 3832 | — | — | 2898 | 3510 | 4616 | 19 | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 405 | 143 | 0 | 307 | 328 | 541 | 984 | 143 | 314 | 307 | 328 | 1620 | 1725 | 101 | 0 | 21 | 101 | 21 | 0 | 44 | 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.











