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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
16 Day Weather and Surf, issued 7 pm Wednesday 13 May 2026 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
21.1° C
(Which is slightly warmer than usual)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 Monday (May 18) at 11AM. The primary swell is predicted to be 2.1m and 11s period with a secondary swell of 1.0m and 18s. 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 14s and forecast to arrive on Friday (May 15) 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 0.8m 4s period and expected on Wednesday (May 20) at 11AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Mon 18th May) | 7ft (2.1m) 11s |
| Best Surf | 11PM (Tue 19th May) | 8ft (2.5m) 16s |
| Most Powerful | 5AM (Fri 15th May) | 15ft (4.5m) 14s |
Table - best surf conditions forecast for Big Rock over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 6mm), mostly falling on Thu night. Very mild (max 17°C on Wed night, min 15°C on Thu morning). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Sat night. Very mild (max 19°C on Sun night, min 15°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Thursday 14 | Friday 15 | Saturday 16 | Sunday 17 | Monday 18 | Tuesday 19 | Wed 20 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
WSW 14 | WSW 13 | WSW 13 | SW 14 | SW 14 | SW 15 | SW 14 | SW 13 | SW 12 | SW 12 | SW 11 | SW 11 | SW 11 | SW 11 | SW 11 | WSW 16 | SW 16 | SW 16 | SW 15 | WSW 15 | WSW 16 | |
5318 | 3949 | 3314 | 6841 | 6165 | 7258 | 5020 | 2830 | 2099 | 1674 | 1389 | 1259 | 999 | 1053 | 1092 | 1261 | 3515 | 3040 | 2665 | 2544 | 2948 | |
Wind (km/h) | |||||||||||||||||||||
cross-on | on | on | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-off | cross | off | cross-off | cross | cross-off | cross | cross | |
High Tide | 9:43PM0.69m | 8:06AM0.92m | 8:23AM0.99m | 8:46AM1.06m | 9:12AM1.11m | 9:41AM1.14m | 10:09AM1.15m | 10:36AM1.11m | |||||||||||||
Low Tide | 1:13AM0.65m | 4:04PM0.40m | 4:53PM0.34m | 5:46PM0.30m | 6:44PM0.28m | 7:49PM0.29m | 9:01PM0.32m | ||||||||||||||
 |  | |  |  | |  | |  | | |  | | | |  | | | | | | |
 | — | 7:03 | — | — | 7:03 | — | — | 7:05 | — | — | 7:05 | — | — | 7:05 | — | — | 7:07 | — | — | 7:07 | — |
 | 5:29 | — | 5:28 | — | — | 5:27 | — | — | 5:27 | — | — | 5:25 | — | — | 5:24 | — | — | 5:24 | — | — | 5:23 |
1 | — | — | 4 | — | — | — | — | 1 | 2 | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 17 | 16 | 17 | 17 | 15 | 15 | 15 | 17 | 17 | 18 | 18 | 18 | 19 | 18 | 18 | 16 | 18 | 19 | 19 | 20 | 20 |
14 | 11 | 11 | 11 | 10 | 10 | 11 | 13 | 13 | 15 | 16 | 16 | 17 | 17 | 16 | 14 | 15 | 17 | 18 | 18 | 20 | |
Swell 1 Height (m) Direction Period (s) | WSW 14 | WSW 13 | WSW 13 | SW 14 | SW 14 | SW 15 | SW 14 | SW 13 | SW 12 | SW 12 | SW 11 | SW 11 | SW 11 | SW 11 | SW 11 | SW 12 | SW 16 | SW 16 | SW 15 | WSW 15 | WSW 16 |
 kJ | 5318 | 3949 | 3314 | 6841 | 6165 | 7258 | 5020 | 2830 | 2099 | 1674 | 1389 | 1259 | 999 | 1053 | 1092 | 1172 | 3515 | 3040 | 2665 | 2544 | 2948 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | SSW 18 | — | — | — | — | W 24 | WSW 21 | WSW 21 | WSW 19 | WSW 18 | WSW 17 | WSW 16 | S 11 | S 10 | NNE 5 | — | N 5 |
| kJ | — | — | — | — | 565 | — | — | — | — | 11 | 45 | 89 | 251 | 596 | 932 | 1261 | 58 | 18 | 7 | — | 24 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 22 | — | S 12 | — | — | — | — | S 9 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 119 | — | 44 | — | — | — | — | 7 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NNE 4 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 26 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 359 | 359 | 359 | 2 | 2 | 2 | 2 | 359 | 2 | 2 | 2 | 1 | 0 | 1 | 0 | 7 | 0 | 0 | 0 | 20 |
Best forecast wave conditions in Margaret River | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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Ocean Swells (m)- Wind Speed (km/h)
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 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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