Surf Forecasts:
Big Rock surf forecast from 18 Aug 2026:
- Best quality surf: Saturday 22 Aug, 5AM (local time) - 10ft (3.0m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 19 Aug, 2PM (local time) - 15ft (4.5m), 15s period, WSW swell with 9,740 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 5AM (local time) - 11ft (3.5m), 15s period with SW 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 Friday (Aug 21) at 5AM. The primary swell is predicted to be 3.5m and 15s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Big Rock in the next 16 days are 4.5m 15s and forecast to arrive on Wednesday (Aug 19) at 2PM. 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+) | 5AM (Fri 21st Aug) | 11ft (3.5m) 15s |
| Best Surf | 5AM (Sat 22nd Aug) | 10ft (3.0m) 17s |
| Most Powerful | 2PM (Wed 19th Aug) | 15ft (4.5m) 15s |
Table - best surf conditions forecast for Big Rock over the next 16 days.
Short Range ForecastLight rain (total 4mm), mostly falling on Tue night. Very mild (max 16°C on Tue night, min 13°C on Thu night). Winds decreasing (fresh winds from the WNW on Tue night, light winds from the S by Thu night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 16°C on Sat night, min 12°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 16 | WSW 15 | WSW 15 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | WSW 15 | WSW 14 | WSW 13 | WSW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 10173 | 8941 | 6238 | 8590 | 9739 | 9256 | 6829 | 6389 | 6085 | 5024 | 4720 | 2926 | 3953 | 3441 | 2066 | 2641 | 1915 | 3130 | 2222 | 1693 | 1726 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | cross | glassy | cross-on | cross-off | cross | cross-on | cross-on | cross-on | cross | glassy | cross | cross-on | cross-on |
High Tide | 00:37AM0.74m | 1:15AM0.78m | 2:08AM0.81m | 3:39AM0.84m | 5:28AM0.87m | 6:35AM0.90m | |||||||||||||||
Low Tide | 3:35PM0.38m | 3:25PM0.34m | 3:31PM0.30m | 3:41PM0.29m | 3:54PM0.28m | 4:05PM0.29m | 4:17PM0.29m | ||||||||||||||
 |  |  |  | |  | | |  |  | |  | | | | | | | | | | |
 | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | 6:48 | — | — |
 | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — |
mm | — | — | 3 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 6 |
Temp °C | 15 | 15 | 16 | 16 | 15 | 15 | 16 | 16 | 16 | 14 | 15 | 14 | 15 | 15 | 16 | 15 | 15 | 15 | 14 | 15 | 16 |
Feels °C | 10 | 10 | 8 | 11 | 11 | 10 | 12 | 13 | 13 | 14 | 12 | 11 | 13 | 10 | 12 | 10 | 10 | 11 | 10 | 10 | 9 |
Swell 1 Height (m) Direction Period (s) | WSW 16 | WSW 16 | — | WSW 15 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | WSW 15 | WSW 14 | WSW 13 | — |
| kJ | 10173 | 8941 | — | 8590 | 9739 | 9256 | 6829 | 6389 | 6085 | 5024 | 4720 | 2926 | 3953 | 3441 | 2066 | 2641 | 1915 | 3130 | 2222 | 1693 | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SW 24 | SW 20 | SW 18 | — | — | WSW 20 | WSW 18 | WSW 16 | — | — | SSW 10 | — |
| kJ | — | — | — | — | — | — | — | — | — | 142 | 808 | 2125 | — | — | 163 | 851 | 1393 | — | — | 58 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | WSW 15 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WSW 13 |
| kJ | — | — | 6238 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1726 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 251 | 202 | 221 | 2 | 2 | 86 | 2 | 2 | 1 | 0 | 1 | 0 | 1 | 1689 | 2 | 2 | 20 | 0 | 53 | 53 | 279 |
Best forecast wave conditions in Margaret River | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Big Rock surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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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