Surf Forecasts:
Secret Harbour surf forecast from 7 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 2PM (local time) - 6ft (1.9m), 15s period, WSW swell with offshore winds.
- Most powerful swell: Tuesday 8 Sep, 2PM (local time) - 8ft (2.5m), 17s period, WSW swell with 3,500 kJ wave energy.
- Next surfable swell (1★+): Wednesday 9 Sep, 2PM (local time) - 6ft (1.9m), 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 Wednesday (Sep 09) at 2PM. The primary swell is predicted to be 1.9m and 15s 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 2.5m 17s and forecast to arrive on Tuesday (Sep 08) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Wednesday (Sep 09) at 5AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Wed 9th Sep) | 6ft (1.9m) 15s |
| Best Surf | 2PM (Wed 9th Sep) | 6ft (1.9m) 15s |
| Most Powerful | 2PM (Tue 8th Sep) | 8ft (2.5m) 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 shaping up for Secret Harbour over the next couple of weeks. We’ve got a bit of a mixed bag, so let’s get into it.
The opening days are a bit of a slow burn. The first call is Tuesday morning, the 8th of September, with a solid 8ft swell out of the WSW, but that east-southeast cross-offshore breeze at 16 mph is keeping things pretty clean. The water’s sitting at 64°, which is about what you’d expect for this time of year. That swell energy is strong at 3164, but the commentary flags it as marginal, so don't expect perfection. Wednesday the 9th sees a drop to a still-chunky 6ft, but the real gem is Wednesday afternoon – 6ft of WSW groundswell with a 15-second period and a fresh offshore easterly. That’s your standout. Clean, lined-up waves for the experienced crew. It’s a sandbar set-up, so it’s not a beginner's wave at this size, but for those with a bit of skill, that Wednesday arvo window is the pick of the week.
Thursday the 10th offers smaller 4ft surf with moderate offshore winds – good for a cruise, but nothing to get too excited about. Then we hit a patchy run. Friday the 11th has a weird long-period 19-second swell, but the wind swings cross-shore and then cross-on, making it messy. Saturday the 12th and Sunday the 13th are a write-off with onshore winds and rain. The 14th (Monday morning) brings a promising 7ft swell from the WSW with a light cross-offshore breeze – another session for the experienced, but the afternoon turns choppy.
The second week is more of a gamble. Tuesday the 15th and Wednesday the 16th stay in the 5ft to 7ft range, but winds are mostly cross-on or onshore, keeping things average. From Thursday the 17th right through to the 23rd, the onshore winds get nasty, especially around the 18th and 21st with strong westerlies. There’s plenty of size – 8ft on the 18th, 7ft on the 21st – but with that wind, it’s a choppy mess. If you’re a kiter, that might look fun, but for a paddle surfer, it’s a hard pass. The final Wednesday on the 23rd shows a 8ft WSW swell, but the light cross-onshore wind won’t save it.
So, to sum it up: the best window is Wednesday afternoon, the 9th, with that 6ft of clean, offshore-groundswell. For a backup, Monday morning the 14th is worth a look if you’re advanced. The rest of the fortnight is mostly about waiting for the wind to play nice.
Stay safe out there.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Wed afternoon, min 10°C on Tue night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Fri night. Very mild (max 19°C on Fri morning, min 14°C on Sun night). Winds decreasing (strong winds from the NW on Sat morning, light winds from the SSW by Sun night). | ||||||||||||||||||||
Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | |||||||||||||||
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 17 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 15 | WSW 15 | WSW 14 | WSW 16 | W 19 | W 19 | W 17 | W 16 | W 16 | WSW 10 | W 15 | W 14 | WSW 14 | WSW 14 | WSW 14 | WSW 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3164 | 3256 | 2310 | 1753 | 1500 | 1216 | 744 | 734 | 839 | 904 | 1199 | 2400 | 1459 | 1117 | 610 | 871 | 1948 | 2019 | 1705 | 1970 | 2550 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | off | off | off | off | off | off | cross | cross-on | cross | on | cross-on | cross-on | cross-on | on | cross-off | cross-off | cross-on | cross-off |
High Tide | 11:28PM0.55m | 8:34AM0.84m | 10:38PM0.55m | 9:21AM0.80m | 10:21PM0.58m | 10:01AM0.74m | 10:17PM0.63m | 10:34AM0.66m | 10:23PM0.68m | 10:57AM0.57m | 10:36PM0.72m | 11:02AM0.49m | 10:56PM0.75m | ||||||||
Low Tide | 4:03PM0.29m | 00:54AM0.54m | 4:19PM0.34m | 2:15AM0.49m | 4:26PM0.40m | 3:12AM0.45m | 4:21PM0.45m | 4:02AM0.42m | 4:07PM0.47m | 4:51AM0.41m | 3:46PM0.46m | 5:43AM0.41m | 3:24PM0.42m | ||||||||
 |  |  | | | | | |  | | |  |  | | |  | | | | | | |
 | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:04 | — | — | 6:04 | — | — | 6:05 | — | — | 6:05 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | — | — | — | — | — | — | — | — |
Temp °C | 14 | 19 | 17 | 16 | 20 | 19 | 18 | 20 | 19 | 19 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 17 |
Feels °C | 9 | 13 | 13 | 10 | 16 | 16 | 14 | 17 | 17 | 17 | 15 | 18 | 12 | 12 | 14 | 14 | 13 | 16 | 17 | 15 | 14 |
Swell 1 Height (m) Direction Period (s) | WSW 17 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 15 | WSW 15 | WSW 14 | WSW 16 | W 14 | W 14 | W 17 | W 16 | W 8 | WSW 10 | W 15 | W 14 | WSW 14 | WSW 14 | WSW 14 | WSW 15 |
| kJ | 3164 | 3256 | 2310 | 1753 | 1500 | 1216 | 744 | 734 | 839 | 703 | 802 | 2400 | 1459 | 341 | 610 | 871 | 1948 | 2019 | 1705 | 1970 | 2550 |
Swell 2 Height (m) Direction Period (s) | — | — | SSE 5 | — | — | W 26 | WSW 24 | WSW 23 | W 22 | W 19 | W 19 | — | — | W 16 | W 14 | — | — | — | W 24 | — | — |
| kJ | — | — | 4 | — | — | 53 | 109 | 107 | 236 | 904 | 1199 | — | — | 1117 | 602 | — | — | — | 11 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SE 4 | — | E 4 | E 4 | — | NE 4 | ENE 4 | — | ENE 3 | — | — | NW 5 | WNW 6 | — | — | WSW 9 | — | — | — | — | — |
| kJ | 16 | — | 21 | 16 | — | 10 | 8 | — | 6 | — | — | 47 | 237 | — | — | 639 | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 102 | 21 | 101 | 101 | 0 | 0 | 0 | 0 | 0 | 46 | 272 | 221 | 736 | 1742 | 328 | 407 | 369 | 0 | 0 | 101 | 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.
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