Secret Harbour Surf Break

Lat Long: 32.40° S 115.74° E

Secret Harbour Surf Forecast and Surf Report

Issued: 7 pm 08 Aug 2026 (local time)

Forecast update in  hr  min

Today's Secret Harbour sea temperature is
17.8° C
0.9° 

Secret Harbour surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Secret Harbour surf forecast from 8 Aug 2026:

  • Best quality surf: Tuesday 11 Aug, 8AM (local time) - 11ft (3.5m), 16s period, WSW swell with cross-offshore winds.
  • Most powerful swell: Saturday 8 Aug, 11PM (local time) - 15ft (4.5m), 17s period, WSW swell with 11,788 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 11 Aug, 8AM (local time) - 11ft (3.5m), 16s 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 Tuesday (Aug 11) at 8AM. The primary swell is predicted to be 3.5m and 16s 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 4.5m 17s and forecast to arrive on Saturday (Aug 08) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives.

Wave TypeTime (AWST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Tue 11th Aug)11ft (3.5m) 16s
Best Surf 8AM (Tue 11th Aug)11ft (3.5m) 16s
Most Powerful11PM (Sat 8th Aug)15ft (4.5m) 17s

Table - best surf conditions forecast for Secret Harbour over the next 16 days.


The Lowdown

Alright, let’s get into it. This is Rusty, and I’ve got a good look at what’s coming for Secret Harbour.

First up, the water temp is sitting at 64°, which is about 2° cooler than the long-term average for this time of year – nothing to stress about, just a touch on the chilly side. The swell energy is pumping, with a massive reading of 12,279 (very strong) for the first session, but it’s a mess right now. Saturday afternoon has a 16ft WSW swell with a very long period of 16 seconds, but it’s coming with a 25 mph cross-onshore wind and light rain. That’s a write-off – poor surf conditions, blown out, and way too big for anyone but the most experienced.

Sunday morning sees the swell drop to 12ft from the WSW, with a 17-second period, and the wind turns onshore but lighter at 9 mph. The energy is still substantial (5,733), but the report says marginal due to tide. By Sunday afternoon, it’s back to poor with 12 mph onshore wind. Monday is a total loss: 28-31 mph winds, near gale, and 10-13ft of messy swell. That’s kite-surfing territory, not paddle surfing.

Now, Tuesday morning the 11th of August is where we start to see some hope. The swell is still 13ft from the WSW with a 16-second period, and the energy is high (7,494). The wind is a light 6 mph cross-onshore. It’s still marginal, but the score is a 7 – that’s the best of the first week. The waves will have heaps of grunt, but that long period means it’ll be a bit walled up at a beach break like Secret Harbour. It’s a sandbar, so it might line up okay, but it’s more of a spot for the experts given the size.

The real standout? Wednesday the 12th and Thursday the 13th. The swell drops to a more manageable 7-8ft, still from the WSW, with a 15-16 second period. The energy is in the moderate range (2,182-2,660). But the wind – oh, the wind. Wednesday afternoon goes glassy, and both mornings have clean, cross-offshore winds. The report says “excellent surf conditions for experienced surfers,” and I’m buzzing for that. For a surfer, that’s smooth, lined-up groundswell with no chop. This is your window. The crowd factor at Secret Harbour is “sometimes,” so you might have a few others out, but it’s not a circus.

Friday the 14th and Saturday the 15th mornings stay clean with cross-off winds and dropping swell (6-7ft), still with that good period. It’s not as punchy, but it’s quality.

Then there’s a gap. Sunday the 16th is marginal, with a 7ft W swell and a 13-second period, but the wind is a fresh 19 mph cross-off – that’s clean but a bit breezy. Monday the 17th jumps back up to 12ft from the W, with a 17-second period, but the wind is a moderate cross-shore, and it’s only marginal. Tuesday the 18th is a write-off again with 31 mph winds.

Here’s the long-range promise: Wednesday the 19th of August. The swell is 15ft from the W with a 15-18 second period, and the energy is massive (8,158 to 14,770). The wind is a moderate cross-shore, and the report says the swell is predicted to be too big for this break. That’s a 15ft wave – only for the absolute experienced, and even then, it’s going to be a beast. The period is long, so it’ll be a paddle battle, but if you’re a charger, that’s a day to mark. Thursday the 20th is still big (13ft) and marginal, but the wind is fresh cross-shore, making it lumpy.

The rest of the window into the 22nd and 23rd of August is on the bigger side (10-13ft), with cross or onshore winds and poor conditions. Not worth the drive.

So, to sum it up: the best bet is Wednesday the 12th through Friday the 14th of August, when you get clean, 7-8ft WSW groundswell with glassy or light offshore winds. That’s the pick. The long-range standout on the 19th is for the big-wave crew only, and it’s a long way out, so keep an eye on it.

Rusty.

Short Range Forecast

Moderate rain (total 15mm), heaviest on Sun night. Very mild (max 17°C on Mon morning, min 9°C on Mon night). Winds increasing (light winds from the S on Sun morning, strong winds from the SW by Mon afternoon).

Days 5-7 Weather Summary

Mostly dry. Very mild (max 18°C on Fri afternoon, min 11°C on Wed morning). Wind will be generally light.

Sunday
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
7
5
2
0
0
0
6
6
5
5
4
3
4
4
2
4
4
3
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
4
WSW
17
3.5
WSW
17
3
WSW
16
2.4
WSW
16
3
WSW
8
4
WSW
10
3.5
WSW
16
3.5
WSW
16
3
WSW
16
2.5
WSW
16
2.2
WSW
15
2.1
WSW
14
2.1
WSW
15
2.2
WSW
17
2.2
WSW
17
2.2
WSW
16
2.1
WSW
16
2
WSW
16
1.8
WSW
14
Wave Graph
Metric surfscale
Energy kJ
10297
5733
3800
2723
1163
3051
6575
6278
5506
3549
2111
1752
1850
2598
2660
2417
2226
1956
1340
Wind (km/h)
15
SSE
10
WSW
20
W
30
WNW
45
WSW
50
SSW
15
SSE
10
S
10
SW
10
E
15
N
5
W
10
E
0
ENE
10
SSW
10
E
10
NE
10
SSW
10
E
Wind State
cross
on
cross-on
cross-on
on
cross-on
cross
cross
cross-on
off
cross-off
cross-on
cross-off
glassy
cross-on
off
off
cross-on
off
High Tide
6:19AM0.95m
7:30AM0.98m
8:28AM0.99m
9:18AM0.97m
00:50AM0.56m
10:01AM0.94m
00:08AM0.59m
10:37AM0.87m
11:58PM0.63m
Low Tide
4:18PM0.23m
4:49PM0.24m
5:17PM0.28m
5:42PM0.34m
1:35AM0.56m
5:57PM0.41m
3:05AM0.56m
5:59PM0.48m
4:05AM0.56m
cloud
cloud
cloud
rain showers
rain showers
light rain
rain showers
cloud
clear
clear
cloud
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:00
6:58
6:58
6:56
6:56
6:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:44
5:45
5:45
5:45
5:46
5:46
5:47
 mm
6
4
3
2
Temp °C
12
14
16
16
17
13
10
11
14
15
12
15
15
14
15
15
16
18
18
Feels °C
5
12
12
13
9
3
2
8
11
11
9
14
13
13
13
12
14
16
15
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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