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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 7 am Saturday 30 Aug 2025 AWST
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 Saturday (Aug 30) at 11PM. The primary swell is predicted to be 1.3m and 20s period with a secondary swell of 1.6m and 16s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Big Rock in the next 12 days are 5.0m 17s and forecast to arrive on Thursday (Sep 04) at 11AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 4s period and expected on Saturday (Aug 30) at 2PM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sat 30th Aug) | 4.5ft (1.3m) 20s |
| Best Surf | 11AM (Thu 4th Sep) | 16ft (5.0m) 17s |
| Most Powerful | 11AM (Thu 4th Sep) | 16ft (5.0m) 17s |
Table - best surf conditions forecast for Big Rock over the next 12 days.
Short Range Forecast Mostly dry. Very mild (max 16°C on Sat night, min 12°C on Sat morning). Wind will be generally light. | Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Wed night. Very mild (max 17°C on Wed afternoon, min 11°C on Tue night). Winds increasing (calm on Tue morning, strong winds from the W by Wed night). | ||||||||||||||||||||
Saturday 30 | Sunday 31 | Monday 01 | Tuesday 02 | Wednesday 03 | Thursday 04 | Friday 05 | |||||||||||||||
| 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) (?) | 16 | 22 | 19 | 17 | 16 | 15 | 14 | 14 | 13 | 13 | 13 | 15 | 14 | 14 | 11 | 17 | 16 | 14 | 13 | 8 | 11 |
Wave (?)Graph  | |||||||||||||||||||||
| Energy (?) | 666 | 937 | 3181 | 5837 | 5110 | 3725 | 2878 | 2826 | 3201 | 3397 | 5643 | 6371 | 3253 | 4824 | 5752 | 15260 | 11488 | 6314 | 2666 | 2361 | 6672 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | on | cross- off | cross- on | cross- on | cross- on | on | on | cross- on | glass | cross- on | off | cross- on | on | on | on | on | cross- on | on | cross- on | cross- on |
High Tide / height (m) | 1:02AM 0.81 | 1:56AM 0.84 | 3:36AM 0.85 | 5:38AM 0.88 | 6:53AM 0.90 | 7:51AM 0.91 | 11:56PM 0.60 | ||||||||||||||
Low Tide / height (m) | 3:16PM 0.34 | 3:11PM 0.32 | 3:13PM 0.30 | 3:22PM 0.28 | 3:38PM 0.27 | 3:57PM 0.27 | 4:18PM 0.28 | 1:16AM 0.60 | |||||||||||||
Saturday 30 | Sunday 31 | Monday 01 | Tuesday 02 | Wednesday 03 | Thursday 04 | Friday 05 | |||||||||||||||
| Sunrise | 6:41 | - | - | 6:39 | - | - | 6:39 | - | - | 6:37 | - | - | 6:35 | - | - | 6:35 | - | - | 6:33 | - | - |
| Sunset | - | 6:00 | - | - | 6:00 | - | - | 6:00 | - | - | 6:01 | - | - | 6:01 | - | - | 6:02 | - | - | 6:04 | - |
 |  |  | | |  | | | | | | | | |  |  | |  |  |  |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 | - | - | - | 5 | 3 | 1 |
| Temp. °C | 14 | 15 | 16 | 15 | 15 | 15 | 16 | 16 | 16 | 15 | 15 | 14 | 15 | 17 | 16 | 15 | 16 | 15 | 15 | 13 | 13 |
| Feels °C (?) | 10 | 12 | 14 | 11 | 11 | 12 | 11 | 11 | 11 | 14 | 13 | 13 | 13 | 11 | 10 | 10 | 11 | 9 | 7 | 0 | 1 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for WA - Margaret River
Still cross-shore at Big Rock (light winds from the N at Witchcliffe 21 km from Big Rock). 1.3m 9s swell from the SSW with a 0.7m 16s long period groundswell from the WSW and a 0.4m 12s groundswell, also from the WSW. 3 swells combining to make bigger set waves.
21 km away, 48 min ago
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.
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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