Surf Forecasts:
Big Rock surf forecast from 30 Aug 2026:
- Best quality surf: Sunday 6 Sep, 8PM (local time) - 16ft (5.0m), 18s period, WSW swell with cross-onshore winds.
- Most powerful swell: Sunday 6 Sep, 8PM (local time) - 16ft (5.0m), 18s period, WSW swell with 15,717 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 8PM (local time) - 16ft (5.0m), 18s period with WSW swell.
Best Forecast Surf Conditions for Big Rock this week:
The surf forecast for Big Rock over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 06) at 8PM. The primary swell is predicted to be 5.0m and 18s period with a secondary swell of 0.1m and 15s. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Big Rock in the next 16 days are 5.0m 18s and forecast to arrive on Sunday (Sep 06) at 8PM. 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+) | 8PM (Sun 6th Sep) | 16ft (5.0m) 18s |
| Best Surf | 8PM (Sun 6th Sep) | 16ft (5.0m) 18s |
| Most Powerful | 8PM (Sun 6th Sep) | 16ft (5.0m) 18s |
Table - best surf conditions forecast for Big Rock over the next 16 days.
The Lowdown
Alright, surfers, Rusty here.
It’s going to be a long, slow burn with one short window of glory. There is a lot of swell on the way, but the wind is going to make a mess of most of it. For the first nine days, it’s mostly a write-off: strong onshore and cross-shore winds are going to chop up some honestly solid waves. The water’s running at 65°, which is a touch warmer than normal for this time of year, so you can leave the wetsuit at home.
Here’s the one standout: Big Rock is a reef break, and it’s fairly consistent. The big news is the back half of the second week. On the morning of Monday, September 9, we get a clean window. Swell is a solid 15ft from the WSW with a 16-second period. That’s a powerful groundswell (combined energy 9429) and with a NNE breeze giving us clean offshore wind. That’s the session. The reef should handle that long-period energy beautifully. It’s too big for beginners at that size, but for anyone with experience, it’s your only real chance at a classic wave.
The rest of the run-up is brutal. The first few days from August 30 through September 4 are plagued by strong, messy winds and onshore slop. There’s a pulse of serious size – 16ft on the 4th of September (energy over 11,000) but with a cross-onshore wind it’s going to be a washing machine. That setup looks more interesting for kite surfing than paddle surfing.
After that September 9th highlight, the wind swings back onshore and the swell stays big but messy right through to the 14th. There is another marginal window on the afternoon of September 7 with a 13ft swell and 16-second period (energy 14487) but with a gentle cross-onshore, it’ll be pretty choppy. Not a patch on the 9th.
In short: Wait for the 9th of September. Everything else is either blown out or too sketchy for a good time.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Mon afternoon. Very mild (max 19°C on Sun afternoon, min 13°C on Mon afternoon). Winds increasing (light winds from the WNW on Sun night, fresh winds from the WNW by Mon afternoon). | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Wed afternoon. Very mild (max 16°C on Thu afternoon, min 12°C on Fri morning). Winds decreasing (near gales from the W on Thu night, light winds from the SW by Fri night). | |||||||||||||||||||
Sun 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | ||||||||||||||
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 16 | WSW 17 | WSW 16 | WSW 16 | WSW 15 | WSW 14 | SW 14 | WSW 13 | WSW 13 | SW 14 | SW 14 | SW 14 | WSW 10 | WSW 14 | WSW 16 | WSW 14 | SW 14 | SW 13 | SW 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 4320 | 3116 | 3428 | 3075 | 4299 | 3243 | 2907 | 3372 | 3247 | 3149 | 3706 | 4681 | 3757 | 4756 | 9349 | 11654 | 6868 | 3875 | 2103 | 6610 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross | cross-on | on | on | on | on | cross-on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross |
High Tide | 11:15PM0.67m | 11:39AM0.61m | 11:33PM0.73m | 12:35PM0.51m | 11:57PM0.78m | 00:29AM0.82m | 1:15AM0.84m | 2:47AM0.85m | ||||||||||||
Low Tide | 5:13PM0.46m | 5:41AM0.44m | 4:55PM0.49m | 7:07AM0.42m | 3:46PM0.49m | 10:34AM0.40m | 1:11PM0.31m | 1:59PM0.24m | 2:41PM0.19m | |||||||||||
 |  |  |  |  | | | |  | | | | |  | | | | |  |  | |
 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — |
 | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:02 | — | — | 6:04 | — |
mm | — | — | — | 2 | — | — | — | — | — | 2 | — | — | — | 3 | — | — | — | 1 | 2 | 10 |
Temp °C | 19 | 17 | 17 | 17 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 15 | 16 | 16 | 12 | 12 | 13 | 14 | 16 | 14 |
Feels °C | 17 | 17 | 13 | 11 | 9 | 10 | 9 | 10 | 11 | 11 | 13 | 10 | 8 | 7 | 4 | 7 | 8 | 7 | 8 | 2 |
Swell 1 Height (m) Direction Period (s) | WSW 16 | WSW 16 | WSW 17 | WSW 16 | WSW 16 | WSW 15 | WSW 14 | SW 14 | WSW 13 | WSW 13 | SW 14 | SW 14 | SW 14 | — | WSW 14 | WSW 16 | WSW 14 | SW 14 | SW 13 | SW 24 |
| kJ | 4320 | 3116 | 3428 | 3075 | 4299 | 3243 | 2907 | 3372 | 3247 | 3149 | 3706 | 4681 | 3757 | — | 9349 | 11654 | 6868 | 3875 | 2103 | 23 |
Swell 2 Height (m) Direction Period (s) | — | WSW 19 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 16 | S 11 | — |
| kJ | — | 664 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 21 | 199 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 16 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 43 | — |
Wind waves Height (m) Direction Period (s) | — | — | W 5 | WSW 6 | — | — | — | — | — | — | — | — | W 6 | WSW 10 | — | — | — | NW 6 | NW 8 | SW 11 |
| kJ | — | — | 55 | 230 | — | — | — | — | — | — | — | — | 275 | 4756 | — | — | — | 247 | 805 | 6610 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 38 | 34 | 359 | 359 | 2 | 2 | 2 | 64 | 89 | 2 | 2 | 251 | 633 | 1689 | 1105 | 2 | 86 | 221 | 202 | 359 |
Best forecast wave conditions in Margaret River | ||||||||||||||||||||
Best forecast wave conditions in Australia | ||||||||||||||||||||
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Information about the Big Rock Surf forecast
The above surf forecast table for Big Rock provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Big Rock can be found by selecting the local surf guide option on the grey menu. Our Big Rock 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 (Big Rock) 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 Big Rock 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.
Big Rock is 85 km (53 miles) from the city of Bunbury. If you plan a holiday in Margaret River, look for hotels and other accommodation in Bunbury. Bunbury has rooms for a wide range of budgets as well as car hire and transport links.
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