Surf Forecasts:
Secret Harbour surf forecast from 20 Aug 2026:
- Best quality surf: Friday 21 Aug, 5AM (local time) - 7.5ft (2.3m), 15s period, WSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 26 Aug, 11AM (local time) - 11ft (3.5m), 19s period, W swell with 9,548 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 5AM (local time) - 7.5ft (2.3m), 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 Friday (Aug 21) at 5AM. The primary swell is predicted to be 2.3m 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 cross-onshore at the time the swell arrives.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Fri 21st Aug) | 7.5ft (2.3m) 15s |
| Best Surf | 5AM (Fri 21st Aug) | 7.5ft (2.3m) 15s |
| 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 mate, Rusty here. Let's have a look at what's on the menu for Secret Harbour over the next couple of weeks.
First up, the water temperature is sitting pretty much where you'd expect for this time of year, so no need for a thicker wetsuit just yet.
We've got a bit of a slow start, but things are looking up. Friday the 21st of August kicks off with some proper action. Early morning glass-off conditions with a light offshore breeze from the ENE, and a solid 7ft swell from the WSW, with a 15-second period. That's a long-period groundswell, which is going to wrap in nicely here. The energy is very strong (2065), and the waves are packing a punch. This is excellent surf, but with that size, it's strictly for the experienced crew. Expect some long lulls between sets, but the waves that come through will be well-shaped and powerful.
The afternoon gets messy with a strong cross-onshore wind, so bag that morning session.
Saturday the 22nd is another early bird special. A clean north wind, glassy conditions, and a 7ft swell from the same WSW direction, with a very long 16-second period. The ocean is going to be nearly perfect, with serious energy (2068) in the water. Again, this is for the advanced surfer only. The early morning is the time to be out there, as the afternoon winds pick up strong from the SSW.
Sunday the 23rd is a write-off with strong onshore winds and a deteriorating swell.
Monday the 24th is a bit of a miracle. We get another glassy morning with a light NNE breeze, and a 7ft WSW swell at 14 seconds. The energy is pumping (1748), and the waves are going to be clean and powerful. This is a standout morning once again for the advanced surfers.
After a few days of mixed conditions, things start to get interesting again. Wednesday the 26th of August is a big one. We've got a massive 12ft swell from the west, with a 19-second period. The energy is absolutely colossal (9548), and the waves will be huge. The morning has a light cross-onshore wind and some rain, which isn't ideal, but the sheer size and power are noteworthy. This is for experts only, and even then, it's a serious mission. The afternoon is blown out.
Then we've got a gap of fairly poor conditions until we hit another big standout. The 5th of September, a Saturday morning, is looking unreal. Completely glassy, calm winds, and a 10ft WSW swell with an 18-second period. The energy is extreme (5146). This is exceptional surf for expert surfers. The swell direction is perfect for the break, and with zero wind, it's going to be a pristine, heavy day. This one is a long way out, so it's a promising call, but keep it on the radar.
Overall, the best windows are the Friday 21st, Saturday 22nd, and Monday 24th mornings, and the big, promising one on the 5th of September. Get out there early to catch the glass.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Fri afternoon, min 12°C on Sun morning). Mainly fresh winds. | Days 5-7 Weather SummaryModerate rain (total 14mm), heaviest on Wed morning. Very mild (max 16°C on Tue afternoon, min 10°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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 15 | WSW 14 | WSW 15 | WSW 16 | WSW 16 | WSW 14 | WSW 14 | WSW 13 | WSW 16 | WSW 14 | WSW 13 | WSW 12 | WSW 12 | WSW 16 | WSW 15 | W 19 | WSW 18 | WSW 16 |
Wave Graph | |||||||||||||||||||
2723 | 2021 | 2020 | 1714 | 2068 | 1341 | 742 | 615 | 1134 | 2948 | 1748 | 1110 | 666 | 452 | 1261 | 2133 | 9548 | 7829 | 6292 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-on | cross-off | glassy | cross-on | cross | cross-on | cross-on | cross-off | glassy | on | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross |
High Tide | 2:37AM0.79m | 3:48AM0.80m | 5:09AM0.82m | 6:20AM0.85m | 7:17AM0.88m | 8:05AM0.90m | 11:30PM0.60m | ||||||||||||
Low Tide | 4:16PM0.32m | 4:03PM0.31m | 3:50PM0.31m | 3:49PM0.31m | 3:59PM0.32m | 4:14PM0.35m | 1:25AM0.59m | ||||||||||||
— | 6:48 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:43 | — | — | 6:41 | — | — | |
5:52 | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 9 | 5 | 3 |
Temp °C | 16 | 16 | 18 | 17 | 16 | 16 | 16 | 15 | 16 | 15 | 13 | 14 | 14 | 15 | 16 | 16 | 15 | 15 | 13 |
Feels °C | 14 | 15 | 16 | 13 | 15 | 13 | 10 | 11 | 11 | 11 | 11 | 11 | 12 | 12 | 14 | 13 | 14 | 13 | 8 |
Swell 1 Height (m) Direction Period (s) | WSW 16 | WSW 15 | WSW 14 | WSW 15 | WSW 16 | WSW 16 | WSW 14 | WSW 14 | WSW 13 | WSW 16 | WSW 14 | WSW 13 | WSW 12 | WSW 12 | WSW 16 | WSW 15 | W 19 | WSW 18 | WSW 16 |
2723 | 2021 | 2020 | 1714 | 2068 | 1341 | 742 | 615 | 1134 | 2948 | 1748 | 1110 | 666 | 452 | 1261 | 2133 | 9548 | 7829 | 6292 | |
Swell 2 Height (m) Direction Period (s) | — | W 24 | WSW 22 | WSW 19 | — | — | W 20 | W 18 | W 17 | — | — | — | — | W 17 | — | W 22 | — | — | — |
— | 44 | 93 | 772 | — | — | 30 | 232 | 487 | — | — | — | — | 146 | — | 82 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | SSW 4 | SSW 5 | SSW 6 | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | 29 | 99 | 47 | — | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 45 | 0 | 0 | 405 | 101 | 101 | 1620 | 0 | 0 | 307 | 0 | 46 | 328 | 177 | 102 | 101 | 101 |
Best forecast wave conditions in Perth City Coast | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.











