Surf Forecasts:
Secret Harbour surf forecast from 26 Aug 2026:
- Best quality surf: Sunday 30 Aug, 8AM (local time) - 7ft (2.2m), 19s period, WSW swell with cross-offshore winds.
- Most powerful swell: Thursday 27 Aug, 5AM (local time) - 10ft (3.0m), 16s period, WSW swell with 3,840 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 11PM (local time) - 6ft (1.9m), 17s 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 Saturday (Aug 29) at 11PM. The primary swell is predicted to be 1.9m and 17s 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 3.0m 16s and forecast to arrive on Thursday (Aug 27) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Friday (Aug 28) at 2AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sat 29th Aug) | 6ft (1.9m) 17s |
| Best Surf | 8AM (Sun 30th Aug) | 7ft (2.2m) 19s |
| Most Powerful | 5AM (Thu 27th Aug) | 10ft (3.0m) 16s |
Table - best surf conditions forecast for Secret Harbour over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let's break down the next couple of weeks at Secret Harbour.
The water temp is about what you'd expect for this time of year, nothing to write home about. The early part of this outlook is a total dud. Thursday the 27th is a mess with a 2.5m swell, but the wind is howling cross-shore and the ocean is all lumpy and chopped up. The energy is a hefty 3651 (moderate energy), but it's all for nothing.
Friday the 28th is still just marginal. The swell drops to 1.5m, and the wind goes cross-offshore, cleaning it up a bit, but it's not exciting. The energy is down to 799 (weak energy). Saturday the 29th morning is tiny at 0.9m, but Saturday afternoon the swell jumps to 1.7m from the WSW with a long 19-second period, and the wind goes light and cross-off. The energy is 1947 (moderate). That's a solid, clean session for the experienced crew.
Now, Sunday the 30th of August is the real standout. The swell is 2.1m from the WSW, period is a very long 18 seconds, and the wind goes glassy in the afternoon. The energy is 2408 (moderate). This is exceptional surf for experienced surfers. Clean, powerful lines.
Monday the 31st and Tuesday the 1st of September see the wind turn onshore and cross-onshore, chopping things up. The swell hangs around 1.7m to 2.1m, but the quality drops hard. The energy is still moderate (1996 to 2143), but it's a messy, choppy scene. The rest of that first week into the second week stays marginal, with onshore winds ruining the party.
We hit a rough patch after that. The swell gets big – 4.0m on Saturday the 5th of September – but the wind is cross-onshore and the conditions are poor. The energy is massive (6533 – strong energy), but it's a washing machine.
The real gem of the whole outlook is Monday the 7th of September. The swell is 4.0m from the WSW with a 16-second period, and the wind is glassy. The combined energy is a monstrous 6871 (strong to very strong energy). That is exceptional surf, but only for expert surfers. This is a serious, powerful groundswell.
The rest of the second week is a mixed bag. The swell stays big, with the wind mostly onshore or cross-onshore, keeping the quality marginal. There's a window on Thursday the 10th of September with a 2.5m swell and a light cross-shore breeze that could be worth a look, but it's not the same level.
So, the call is: Sunday the 30th of August is your best bet for a clean, powerful session, and Monday the 7th of September is for the experts only. The rest, you'll be fighting the wind.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Sat afternoon, min 10°C on Thu night). Mainly fresh winds. | Days 4-6 Weather SummarySome drizzle, heaviest during Mon night. Warm (max 23°C on Sun afternoon, min 11°C on Tue morning). Wind will be generally light. | ||||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||
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 16 | WSW 14 | WSW 14 | WSW 13 | WSW 12 | WSW 11 | WSW 19 | WSW 19 | WSW 17 | WSW 18 | WSW 17 | WSW 16 | WSW 17 | W 17 | WSW 16 | WSW 16 | WSW 15 | WSW 14 | WSW 14 | WSW 14 | WSW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3531 | 2680 | 1603 | 721 | 485 | 290 | 627 | 2024 | 2330 | 2963 | 2465 | 1752 | 1972 | 1729 | 1512 | 2080 | 1499 | 1127 | 1775 | 1905 | 1750 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | glassy | cross-on | on | cross | cross | cross-on | on | on | on | on |
High Tide | 8:49AM0.91m | 11:04PM0.62m | 9:30AM0.89m | 10:56PM0.65m | 10:09AM0.85m | 10:56PM0.69m | 10:47AM0.78m | 11:03PM0.73m | 11:24AM0.69m | 11:20PM0.78m | 11:57AM0.58m | 11:47PM0.82m | 11:55AM0.47m | 00:26AM0.84m | |||||||
Low Tide | 4:31PM0.39m | 2:31AM0.57m | 4:46PM0.43m | 3:24AM0.54m | 4:54PM0.48m | 4:15AM0.51m | 4:54PM0.52m | 5:10AM0.49m | 4:42PM0.53m | 6:18AM0.48m | 4:16PM0.51m | 9:00AM0.47m | 3:20PM0.46m | ||||||||
 | |  |  | | | | | | | | | | |  | | |  | |  |  | |
 | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — |
 | — | 5:55 | — | — | 5:57 | — | — | 5:57 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | 1 |
Temp °C | 13 | 15 | 13 | 14 | 17 | 15 | 17 | 19 | 15 | 20 | 23 | 22 | 17 | 18 | 17 | 13 | 14 | 15 | 16 | 17 | 17 |
Feels °C | 7 | 9 | 7 | 8 | 11 | 11 | 13 | 14 | 12 | 19 | 24 | 22 | 16 | 14 | 13 | 10 | 10 | 11 | 13 | 13 | 14 |
Swell 1 Height (m) Direction Period (s) | WSW 16 | WSW 14 | WSW 14 | WSW 13 | WSW 12 | WSW 11 | WSW 11 | WSW 19 | WSW 17 | WSW 18 | WSW 17 | WSW 16 | WSW 17 | W 17 | SW 8 | WSW 16 | WSW 15 | WSW 14 | WSW 14 | WSW 14 | WSW 16 |
| kJ | 3531 | 2680 | 1603 | 721 | 485 | 290 | 197 | 2024 | 2330 | 2963 | 2465 | 1752 | 1972 | 1729 | 452 | 2080 | 1499 | 1127 | 1775 | 1905 | 778 |
Swell 2 Height (m) Direction Period (s) | — | — | — | W 22 | W 20 | W 21 | WSW 19 | — | W 22 | — | — | W 20 | — | — | WSW 16 | — | — | — | — | — | — |
| kJ | — | — | — | 9 | 30 | 231 | 627 | — | 238 | — | — | 280 | — | — | 1512 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | W 26 | W 24 | SSE 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 13 | 11 | 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | S 5 | — | SSE 5 | SSE 5 | SSE 4 | ESE 3 | SE 3 | — | — | — | — | — | WNW 4 | W 5 | — | — | — | — | — | — | WSW 13 |
| kJ | 71 | — | 69 | 45 | 16 | 3 | 4 | — | — | — | — | — | 19 | 93 | — | — | — | — | — | — | 1750 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 101 | 1189 | 1620 | 126 | 178 | 102 | 21 | 24 | 0 | 0 | 0 | 0 | 0 | 369 | 143 | 101 | 387 | 369 | 369 | 101 | 101 |
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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