
Surf Forecasts:
Secret Harbour surf forecast from 11 Sep 2026:
- Best quality surf: Monday 14 Sep, 5AM (local time) - 8ft (2.4m), 14s period, WSW swell with cross-offshore winds.
- Most powerful swell: Saturday 12 Sep, 8AM (local time) - 10ft (3.0m), 16s period, W swell with 5,067 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 5AM (local time) - 8ft (2.4m), 14s 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 (Sep 14) at 5AM. The primary swell is predicted to be 2.4m and 14s 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 3.0m 16s and forecast to arrive on Saturday (Sep 12) at 8AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Monday (Sep 14) at 8PM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Mon 14th Sep) | 8ft (2.4m) 14s |
| Best Surf | 5AM (Mon 14th Sep) | 8ft (2.4m) 14s |
| Most Powerful | 8AM (Sat 12th Sep) | 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 have a look at what's on the table for Secret Harbour over the next couple of weeks.
Straight up, we’ve got some solid groundswell on the way, but this spot can be a bit of a tease with the wind. The water is sitting at 64°, which is a touch below your typical run for this time of year. It’s not a wild swing, but you'll feel it if you're in a summer suit.
The main event is looking like Monday, September 14th. Saturday night's a write-off, and Sunday is messy, but then we get a window. Monday morning is the standout: clean, a light offshore breeze from the ESE, and a nice 8ft WSW groundswell. The period is a solid 14 seconds, so it will have some grunt and proper shape. The combined energy is pumping at 2107 (moderate to strong), so it's got some push. This is one for the experienced crew though; 8ft is getting solid. The wind will be tidy, keeping it clean. That’s your best bet. Afternoons that day get a bit windier, but still cross-off, so not a total loss.
There's a bit of a lull through the middle of the week, with the wind swinging around and making things choppy or onshore. We've got another little window on Tuesday morning the 15th with a clean 7ft and a decent offshore from the ENE, worth a look if you missed the Monday. The size drops off fast after that.
Then we hit a rough patch. From the 16th through the 20th, it's mostly onshore slop or blown-out, with a couple of really big days on the 18th and 19th. That Friday the 18th sees 12ft with onshore gales – unless you've got a kite, stay home. Saturday the 19th is even bigger at 15ft, but it's cross-onshore and choppy as hell. Absolute mess.
It perks up again on Sunday the 20th, but the wind is still cross-on, so the quality is just not there.
Now, looking further ahead, there's a very promising one for Tuesday, September 24th. There’s a clean, glassy morning with a solid 7ft WSW groundswell and a ripping 17-second period. That's proper, long-period energy. Combined energy of 2303, so it's got heaps of grunt. The glassy conditions will make it look like a dream. This is a really promising call for the experts, but keep in mind it’s a long way out and forecasts can change. After that, a clean cross-off moves in for the 25th, but the size drops back.
This is one of those stretches where you’ve really got to pick your moment. The 14th and the 24th are the only real standouts, everything else is a bit of a compromise. For the beginners, most of the decent swell is in the 6ft+ range, which is going to be a handful.
Stay sharp. Rusty out.
Short Range ForecastLight rain (total 3mm), mostly falling on Fri night. Warm (max 20°C on Fri afternoon, min 14°C on Fri morning). Winds decreasing (strong winds from the W on Fri night, light winds from the SSW by Sun night). | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Wed afternoon, min 12°C on Mon night). Winds decreasing (fresh winds from the ESE on Mon night, calm by Wed night). | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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) | W 19 | W 19 | W 17 | W 16 | WSW 10 | W 14 | WSW 14 | WSW 13 | WSW 15 | WSW 14 | WSW 14 | WSW 14 | WSW 14 | WSW 14 | WSW 14 | WSW 14 | WSW 13 | WSW 15 | WSW 13 | WSW 13 | W 12 |
Wave Graph | |||||||||||||||||||||
904 | 1037 | 2171 | 1273 | 1086 | 703 | 1367 | 1192 | 2416 | 2107 | 2297 | 1748 | 1569 | 1419 | 980 | 624 | 294 | 456 | 378 | 273 | 1731 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-on | on | on | cross-on | cross-on | on | cross | cross-off | cross-off | cross-off | off | cross-off | off | cross-off | on | cross-off | cross | cross | cross-on |
High Tide | 10:01AM0.74m | 10:17PM0.63m | 10:34AM0.66m | 10:23PM0.68m | 10:57AM0.57m | 10:36PM0.72m | 11:02AM0.49m | 10:56PM0.75m | 10:13AM0.43m | 11:19PM0.76m | 11:48PM0.77m | 00:21AM0.77m | |||||||||
Low Tide | 4:21PM0.45m | 4:02AM0.42m | 4:07PM0.47m | 4:51AM0.41m | 3:46PM0.46m | 5:43AM0.41m | 3:24PM0.42m | 6:51AM0.41m | 3:06PM0.38m | 2:55PM0.34m | 2:49PM0.31m | ||||||||||
6:22 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — | 6:16 | — | — | 6:15 | — | — | 6:13 | — | — | |
— | 6:05 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:08 | — | |
mm | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 19 | 20 | 18 | 16 | 16 | 16 | 16 | 17 | 18 | 19 | 21 | 16 | 19 | 23 | 22 | 23 | 25 | 24 | 19 | 19 | 18 |
Feels °C | 15 | 17 | 17 | 9 | 12 | 13 | 13 | 14 | 16 | 16 | 18 | 10 | 14 | 20 | 18 | 21 | 24 | 24 | 16 | 15 | 15 |
Swell 1 Height (m) Direction Period (s) | WSW 14 | WSW 14 | W 17 | W 16 | WSW 10 | WSW 10 | WSW 14 | WSW 13 | WSW 15 | WSW 14 | WSW 14 | WSW 14 | WSW 14 | WSW 14 | WSW 14 | WSW 14 | WSW 13 | WSW 15 | WSW 13 | WSW 13 | — |
613 | 704 | 2171 | 1273 | 1086 | 680 | 1367 | 1192 | 2416 | 2107 | 2297 | 1748 | 1569 | 1419 | 980 | 624 | 294 | 456 | 378 | 273 | — | |
Swell 2 Height (m) Direction Period (s) | W 19 | W 19 | — | — | W 16 | W 14 | W 17 | W 16 | — | — | — | — | NNE 4 | — | — | — | W 16 | W 21 | W 20 | WSW 18 | — |
904 | 1037 | — | — | 954 | 703 | 459 | 539 | — | — | — | — | 2 | — | — | — | 174 | 9 | 30 | 67 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | N 4 | NNW 5 | NW 5 | W 9 | — | — | — | — | — | — | — | SE 4 | E 3 | — | NE 3 | NNE 3 | NNW 4 | NW 3 | NW 4 | NW 5 | W 12 |
31 | 21 | 126 | 1010 | — | — | — | — | — | — | — | 16 | 6 | — | 9 | 5 | 3 | 2 | 17 | 90 | 1731 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 46 | 221 | 314 | 958 | 407 | 164 | 369 | 369 | 21 | 0 | 45 | 190 | 101 | 44 | 86 | 46 | 98 | 0 | 307 | 221 | 221 |
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.










