Surf Forecasts:
Secret Harbour surf forecast from 23 Aug 2026:
- Best quality surf: Saturday 29 Aug, 11PM (local time) - 7.5ft (2.3m), 19s period, WSW swell with offshore winds.
- Most powerful swell: Wednesday 26 Aug, 11AM (local time) - 11ft (3.5m), 19s period, W swell with 8,755 kJ wave energy.
- Next surfable swell (1★+): Monday 24 Aug, 5AM (local time) - 7ft (2.2m), 15s 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 Monday (Aug 24) at 5AM. The primary swell is predicted to be 2.2m and 15s 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 19s and forecast to arrive on Wednesday (Aug 26) at 11AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Sunday (Aug 30) at 11AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Mon 24th Aug) | 7ft (2.2m) 15s |
| Best Surf | 11PM (Sat 29th Aug) | 7.5ft (2.3m) 19s |
| Most Powerful | 11AM (Wed 26th Aug) | 11ft (3.5m) 19s |
Table - best surf conditions forecast for Secret Harbour over the next 16 days.
The Lowdown
Alright, Rusty here. Let's talk about what's coming up at Secret Harbour.
We've got a solid run of swell on the way, but you're gonna have to pick your moments. The wind is the real story here – it's going to mess with some otherwise great waves.
The first real standout looks like Monday morning, August 24th. We've got a clean 7ft swell rolling in from the west-southwest with a solid 14-second period, and the wind is a light, cross-off breeze from the east-southeast. The combined swell energy is ripping at 1570 (moderate to strong), and the water temp is about average for the time of year. It's a sandbar, so it’s a bit more fickle than a reef, but when it's on, it's on. This is for the experienced crew, though – that 7ft is a bit much for the groms. The cross-off wind will keep the faces clean, so it’s probably the best all-round session of the first week.
Things get a bit chaotic after that. A strong, long-period groundswell hits on Wednesday, August 26th, with a massive 12ft swell and a period of 19 seconds from the west. The combined energy is a huge 8755 (very strong). That’s expert territory only, and it's a little tricky because a long-period swell like that at a sandbar can be a bit shifty and heavy. The morning wind is light and onshore, which will make it a big, bumpy beast. The afternoon is a cross-onshore chop. Not the best for a clean paddle, but for the big-wave specialists, it's a window.
The next serious highlight is Saturday, August 29th. The morning session has a clean 3ft bump from the west-southwest with a 19-second period, and the wind is a gentle offshore from the east-northeast. That's a beautiful combination for a long, glidey feel. But the real gem is the Saturday afternoon: a glassy 5ft west-southwest swell with a 16-second period. The combined energy is 1804 (moderate to strong), and the wind is dead glassy from the east-northeast. That is as clean as it gets. The sets will be a bit fat, but the shape will be perfect. This is the best session of the entire forecast for the average to advanced surfer.
After that, we have a decent run of clean, cross-off mornings through to the start of September. The Tuesday morning, September 1st looks good – a 7ft west-southwest swell with a 16-second period and a light cross-off breeze from the north. The combined energy is 1846 (moderate to strong). It’s clean, but that 7ft is still a handful for the learner.
The second week brings bigger, more consistent swell, but the wind turns more southerly, making it choppy. The Friday and Saturday, September 5th and 6th, see a return of the 10ft+ swell from the west-southwest, but with strong onshore and cross-shore winds. The combined energy is massive (4300+), but it’s going to be a messy, bumpy mess. This is more of a kite-surfing setup than a clean paddle session. The Monday morning, September 8th is a better bet: a 8ft west-southwest swell with a 13-second period, a clean cross-off breeze from the north-northeast, and a combined energy of 1877. That’s a solid, clean end to the run.
Overall, the standout is Saturday, August 29th afternoon. Get that one in the diary. The Monday morning, August 24th, is a close second for the more experienced paddler.
Rusty.
Short Range ForecastHeavy rain (total 48mm), heaviest during Wed morning. Very mild (max 17°C on Tue afternoon, min 12°C on Sun night). Winds increasing (calm on Mon night, fresh winds from the S by Wed afternoon). | Days 5-7 Weather SummaryMostly dry. Very mild (max 19°C on Sat afternoon, min 9°C on Fri morning). Wind will be generally light. | ||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | ||||||||||||||
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 14 | WSW 13 | WSW 13 | WSW 12 | WSW 14 | W 13 | W 19 | W 18 | WSW 16 | WSW 16 | WSW 14 | WSW 14 | WSW 13 | WSW 12 | WSW 11 | WSW 19 | WSW 16 | WSW 18 |
Wave Graph | |||||||||||||||||||
2368 | 1570 | 1110 | 778 | 521 | 1224 | 2166 | 8755 | 8169 | 5757 | 3784 | 2638 | 1579 | 838 | 557 | 337 | 621 | 1068 | 2930 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | on | cross-off | cross | cross | cross-off | on | cross-on | cross | cross-on | cross-on | cross-off | cross-off | cross-on | off | off | glassy | off |
High Tide | 6:20AM0.85m | 7:17AM0.88m | 8:05AM0.90m | 11:30PM0.60m | 8:49AM0.91m | 11:04PM0.62m | 9:30AM0.89m | 10:56PM0.65m | 10:09AM0.85m | 10:56PM0.69m | |||||||||
Low Tide | 3:49PM0.31m | 3:59PM0.32m | 4:14PM0.35m | 1:25AM0.59m | 4:31PM0.39m | 2:31AM0.57m | 4:46PM0.43m | 3:24AM0.54m | 4:54PM0.48m | 4:15AM0.51m | |||||||||
— | 6:45 | — | — | 6:43 | — | — | 6:41 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | |
5:53 | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — | — | 5:57 | — | — | 5:57 | — | |
mm | — | — | — | — | — | — | 3 | 34 | 11 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 13 | 14 | 14 | 15 | 17 | 17 | 14 | 13 | 13 | 14 | 14 | 14 | 12 | 15 | 15 | 13 | 19 | 17 |
Feels °C | 11 | 11 | 11 | 13 | 10 | 11 | 13 | 10 | 7 | 10 | 10 | 8 | 9 | 9 | 13 | 12 | 9 | 17 | 14 |
Swell 1 Height (m) Direction Period (s) | WSW 16 | WSW 14 | WSW 13 | WSW 13 | WSW 12 | WSW 14 | W 13 | W 19 | W 18 | WSW 16 | WSW 16 | WSW 14 | WSW 14 | WSW 13 | WSW 12 | WSW 11 | WSW 11 | WSW 16 | WSW 18 |
2368 | 1570 | 1110 | 778 | 521 | 1224 | 2166 | 8755 | 8169 | 5757 | 3784 | 2638 | 1579 | 838 | 557 | 337 | 234 | 1068 | 2930 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | WSW 15 | — | W 22 | — | — | — | — | — | — | W 21 | W 20 | WSW 21 | WSW 19 | W 19 | — |
— | — | — | — | 296 | — | 148 | — | — | — | — | — | — | 9 | 30 | 151 | 621 | 736 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 18 | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 25 | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | NNW 2 | NNW 4 | NNW 5 | — | — | — | — | — | — | — | — | — | E 3 | NE 4 | — | NE 4 |
— | — | — | 1 | 13 | 44 | — | — | — | — | — | — | — | — | — | 7 | 8 | — | 10 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 6 | 0 | 221 | 0 | 314 | 328 | 177 | 101 | 360 | 44 | 45 | 101 | 0 | 0 | 45 | 0 | 0 | 0 | 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.











