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Big Rock Surf Forecast
/ WA – Margaret River (57 breaks) / Western Australia (159 breaks) /
Surf Forecasts:
Big Rock surfForecast / WA – Margaret River / Australia
12 Day Weather and Surf, issued 1 am Friday 12 Dec 2025 AWSTForecast update in hr min s Forecast update imminent
Big Rock surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Big Rock sea temperature is
20.2° C
(Which is 1.1°C warmer than normal for this time of year)Best Forecast Surf Conditions for Big Rock this week:
The surf forecast for Big Rock over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Dec 14) at 8AM. The primary swell is predicted to be 1.3m and 11s period with a secondary swell of 0.5m and 7s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Big Rock in the next 12 days are 3.0m 13s and forecast to arrive on Wednesday (Dec 17) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 6s period and expected on Friday (Dec 12) at 5PM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Sun 14th Dec) | 4.5ft (1.3m) 11s |
| Best Surf | 11AM (Sun 14th Dec) | 4ft (1.2m) 11s |
| Most Powerful | 5AM (Wed 17th Dec) | 10ft (3.0m) 13s |
Table - best surf conditions forecast for Big Rock over the next 12 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Mostly dry. Warm (max 32°C on Sun morning, min 13°C on Fri night). Winds decreasing (strong winds from the SSE on Fri afternoon, light winds from the NE by Sun morning). | Days 3-6 Weather Summary Mostly dry. Warm (max 27°C on Mon morning, min 15°C on Wed night). Winds increasing (calm on Mon night, fresh winds from the S by Wed afternoon). | ||||||||||||||||||||
Friday 12 | Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 12 | 12 | 11 | 16 | 15 | 14 | 8 | 10 | 13 | 13 | 12 | 12 | 12 | 11 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 933 | 769 | 615 | 622 | 493 | 396 | 332 | 524 | 486 | 369 | 330 | 393 | 899 | 507 | 1970 | 2362 | 1527 | 1522 | 625 | 414 | 256 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross | cross- off | off | cross- off | cross | cross- off | cross | on | on | cross- on | on | cross- on | cross- on | cross | cross- off | cross | cross- off | cross- off |
High Tide / height (m) | 8:28PM 0.57 | 7:40PM 0.59 | 7:17PM 0.63 | 7:15PM 0.69 | 7:25PM 0.76 | 7:42PM 0.82 | 8:04PM 0.88 | ||||||||||||||
Low Tide / height (m) | 10:58AM 0.35 | 5:55AM 0.35 | 4:50AM 0.28 | 4:46AM 0.22 | 4:56AM 0.17 | 5:12AM 0.14 | 5:31AM 0.13 | ||||||||||||||
Friday 12 | Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | |||||||||||||||
| Sunrise | 5:01 | - | - | 5:01 | - | - | 5:01 | - | - | 5:03 | - | - | 5:03 | - | - | 5:03 | - | - | 5:03 | - | - |
| Sunset | - | 7:23 | - | - | 7:24 | - | - | 7:24 | - | - | 7:25 | - | - | 7:27 | - | - | 7:27 | - | - | 7:28 | - |
 | |  | | | | | | | |  | | | |  | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 23 | 23 | 17 | 25 | 26 | 21 | 32 | 28 | 28 | 27 | 23 | 20 | 20 | 21 | 17 | 17 | 17 | 16 | 20 | 21 | 16 |
| Feels °C (?) | 17 | 16 | 10 | 21 | 20 | 16 | 30 | 26 | 25 | 24 | 23 | 22 | 21 | 19 | 13 | 13 | 11 | 10 | 15 | 14 | 9 |
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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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FREE! Surf-Forecast.com widget for your website
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.
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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 12 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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