Surf Forecasts:
Secret Harbour surf forecast from 29 Aug 2026:
- Best quality surf: Sunday 6 Sep, 8AM (local time) - 15ft (4.5m), 12s period, WSW swell with cross-shore winds.
- Most powerful swell: Sunday 6 Sep, 5AM (local time) - 16ft (5.0m), 12s period, WSW swell with 7,608 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 8AM (local time) - 7ft (2.1m), 19s 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 Sunday (Aug 30) at 8AM. The primary swell is predicted to be 2.1m and 19s 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 5.0m 12s and forecast to arrive on Sunday (Sep 06) at 5AM. 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+) | 8AM (Sun 30th Aug) | 7ft (2.1m) 19s |
| Best Surf | 8AM (Sun 6th Sep) | 15ft (4.5m) 12s |
| Most Powerful | 5AM (Sun 6th Sep) | 16ft (5.0m) 12s |
Table - best surf conditions forecast for Secret Harbour over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s on the cards for Secret Harbour.
We’ve got a bit of a slow start, but things start to fire up from August 30th with a solid pulse of long-period groundswell. The main event is a strong WSW swell, and the wave energy is substantial (2678). The stand-out window hits early on Sunday morning the 30th. The wind is light and cross-off from the NNE at just 3 mph, leaving the surf glassy and clean. At 7 ft with an 18-second period, this is proper groundswell – long lines, plenty of push, but with that kind of period it’ll be walling up and best for experienced surfers on the sandbar. The swell direction is right on the money for this spot.
There’s a long dry spell after that though. From Sunday afternoon right through to September 4th, the conditions are either onshore, choppy, or just messy. The swell stays around 6-7 ft but cross-onshore winds ruin it. The pulse gets bigger on the 4th – up to 12 ft – but the wind is screaming from the SSW at 22 mph, creating lumpy, poor conditions. Not worth paddling out.
Then, things turn around. On September 5th, we get a morning window with that big 10 ft WSW swell and a light cross-off breeze from the north. The energy is strong (3544) and the surf is clean. That’s a lot of water though – over 8 ft, so definitely only for experienced surfers.
The best true standout of the whole run lands on September 8th. Morning sees a glassy clean 6 ft groundswell from the WSW with a 14-second period, and absolutely no wind – glassed off. Combined energy is moderate (1484) but the quality is excellent. If you can get out that morning, it’ll be worth it.
Into the second week, there’s another standout on September 14th. Big 12 ft groundswell from the W, with a massive wave energy reading (10040) and only a light cross-shore breeze. It’s a serious amount of swell, so not for the faint-hearted. It’s promising, but that’s far out so keep an eye on it.
If you’re a beginner, steer clear of most of this – anything over 5 ft, and we’re talking well above that most of the time. The long-period swells (over 15 seconds) will make for long waits between sets, so plan your paddle outs.
-Rusty
Short Range ForecastMostly dry. Very mild (max 19°C on Sun morning, min 13°C on Sun morning). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 12mm), heaviest on Thu night. Very mild (max 17°C on Thu afternoon, min 10°C on Fri night). Winds increasing (calm on Wed night, near gales from the WSW by Thu night). | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
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 18 | WSW 17 | WSW 16 | WSW 17 | W 17 | WSW 16 | WSW 16 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | WSW 14 | WSW 14 | WSW 8 | WSW 14 | WSW 16 | WSW 15 | W 14 | WSW 14 | WSW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2678 | 2437 | 1707 | 2018 | 1729 | 1512 | 1894 | 1479 | 1423 | 1398 | 1316 | 1338 | 1800 | 1921 | 1568 | 5038 | 7282 | 4425 | 2534 | 1019 | 6743 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | glassy | cross-on | cross-on | cross | cross-on | cross-on | on | on | on | cross | cross | cross-on | on | cross-on | cross-on | off | cross | cross-on | cross-on |
High Tide | 10:47AM0.78m | 11:03PM0.73m | 11:24AM0.69m | 11:20PM0.78m | 11:57AM0.58m | 11:47PM0.82m | 11:55AM0.47m | 00:26AM0.84m | 1:21AM0.85m | 2:42AM0.84m | 4:34AM0.84m | ||||||||||
Low Tide | 4:54PM0.52m | 5:10AM0.49m | 4:42PM0.53m | 6:18AM0.48m | 4:16PM0.51m | 9:00AM0.47m | 3:20PM0.46m | 1:54PM0.37m | 2:13PM0.29m | 2:43PM0.25m | |||||||||||
 | |  |  | |  |  | | |  | |  | |  |  | | | | | | | |
 | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — |
 | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — |
mm | — | — | — | — | — | — | — | — | — | 1 | 1 | 2 | — | 2 | 4 | 2 | — | — | — | 3 | 4 |
Temp °C | 19 | 19 | 18 | 17 | 18 | 16 | 15 | 15 | 15 | 15 | 16 | 16 | 15 | 17 | 17 | 14 | 13 | 13 | 14 | 16 | 14 |
Feels °C | 19 | 18 | 18 | 15 | 14 | 13 | 12 | 12 | 12 | 12 | 13 | 15 | 13 | 11 | 10 | 5 | 5 | 9 | 9 | 7 | 3 |
Swell 1 Height (m) Direction Period (s) | WSW 18 | WSW 17 | WSW 16 | WSW 17 | W 17 | WSW 16 | WSW 16 | WSW 15 | WSW 14 | WSW 13 | WSW 13 | WSW 13 | WSW 14 | WSW 14 | — | W 22 | WSW 16 | WSW 15 | W 14 | WSW 14 | — |
| kJ | 2678 | 2437 | 1707 | 2018 | 1729 | 1512 | 1894 | 1479 | 1423 | 1398 | 1316 | 1338 | 1800 | 1921 | — | 82 | 7282 | 4425 | 2534 | 1019 | — |
Swell 2 Height (m) Direction Period (s) | — | — | W 20 | — | — | SW 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 280 | — | — | 255 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | W 5 | — | — | — | — | — | — | — | — | — | WSW 8 | WSW 14 | — | — | — | WNW 6 | WSW 11 |
| kJ | — | — | — | — | 66 | — | — | — | — | — | — | — | — | — | 1568 | 5038 | — | — | — | 266 | 6743 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 143 | 0 | 369 | 369 | 101 | 21 | 101 | 328 | 369 | 101 | 21 | 46 | 328 | 1620 | 1620 | 1721 | 0 | 307 | 328 | 1981 |
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.
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