
Surf Forecasts:
Big Rock surf forecast from 2 Sep 2026:
- Best quality surf: Sunday 6 Sep, 11PM (local time) - 15ft (4.5m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 8PM (local time) - 15ft (4.5m), 17s period, SW swell with 12,170 kJ wave energy.
- Next surfable swell (1★+): Wednesday 2 Sep, 11PM (local time) - 11ft (3.5m), 14s 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 Wednesday (Sep 02) at 11PM. The primary swell is predicted to be 3.5m and 14s 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 17s and forecast to arrive on Sunday (Sep 06) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Wednesday (Sep 09) at 11AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Wed 2nd Sep) | 11ft (3.5m) 14s |
| Best Surf | 11PM (Sun 6th Sep) | 15ft (4.5m) 17s |
| Most Powerful | 8PM (Sun 6th Sep) | 15ft (4.5m) 17s |
Table - best surf conditions forecast for Big Rock over the next 16 days.
The Lowdown
G'day, I'm Rusty. Let's have a look at the surf coming up.
Alright, we've got a solid run of surf on the way, but it's not all gonna be clean. The standout period is definitely the second week, with a real gem of a morning for the experienced crew. The water is sitting at 65°F which is a touch warmer than normal for this time of year, so that's a nice little bonus.
The action kicks off on Wednesday afternoon, September 2nd, at Big Rock. It's a reef break, fairly consistent, and exposed to the SW swell. We're looking at a 12ft SW swell, but the wind is a cross-shore from the SSW at 12 mph, so it's gonna be a bit lumpy. The combined swell energy is solid at 3984, but the conditions are only marginal.
Thursday, September 3rd, is a write-off with a big NW wind and messy conditions.
Friday, September 4th, looks a bit better. The morning is still choppy with a 16ft WSW swell and cross-on wind. But the afternoon shapes up nicely. The wind drops to a gentle breeze from the WSW at 9 mph, still cross-on, but the swell holds at 16ft with a 15-second period. The combined energy is massive at 10881, and it's a marginal but much better prospect. This is a big, powerful swell, so only for the experienced.
Saturday, September 5th, is a total mess with strong winds and rain. Sunday, September 6th, sees a big improvement. The swell drops to 15ft from the SW, but the wind turns cross-offshore from the S at 19 mph in the morning, and then SSE at 16 mph in the afternoon. The conditions are clean. The combined energy is still high at 6882 and 9222, so there's plenty of push. This is a good, solid day.
Now, the real standout comes on Monday, September 7th, in the morning. The wind is a gentle breeze from the SSE at 9 mph, cross-offshore, and the swell is 12ft from the SW with a very long 16-second period. The combined energy is 6816, and the conditions are clean. This is exceptional surf for expert surfers. The long period means the waves will have serious power and shape, a real treat for the point break.
The rest of that week stays clean and fun, with similar 12ft swells and good winds, but the Monday morning is the pick.
The following week, from the 12th of September, we get another standout. Saturday morning, September 12th, is a beauty. The wind is a slight air from the NNE at 3 mph, cross-offshore, with a 12ft WSW swell at a 16-second period. The combined energy is 6524, and it's clean. Another exceptional morning for the experts.
There's a couple of days in the middle of the second week that are poor, but then Monday, September 14th, morning turns glassy with a light WNW wind and a 10ft WSW swell. The combined energy is 3842, and the conditions are excellent for experienced surfers.
The swell starts to fade out after that, dropping to around 7ft by the 17th of September, with the winds turning more cross-on. The last few days are marginal, but the first two weeks have some absolute crackers.
So, if you're an experienced surfer, mark your calendar for Monday morning, September 7th, and Saturday morning, September 12th. Those are the true standouts. The long period swells will be a dream on the reef.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Thu night. Very mild (max 16°C on Wed afternoon, min 13°C on Wed night). Winds increasing (calm on Wed night, strong winds from the W by Thu night). | Days 5-7 Weather SummaryModerate rain (total 13mm), heaviest on Sat afternoon. Very mild (max 16°C on Sat afternoon, min 11°C on Sat afternoon). Winds decreasing (near gales from the SSW on Sat night, light winds from the SE by Mon morning). | |||||||||||||||||||
Wed 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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) | SW 13 | SW 14 | SW 15 | SW 14 | WSW 10 | WSW 13 | WSW 15 | WSW 14 | SW 14 | SW 10 | SW 12 | SW 13 | SW 13 | SW 17 | SW 16 | SW 16 | SW 15 | WSW 16 | WSW 16 | WSW 16 |
Wave Graph | ||||||||||||||||||||
3984 | 4943 | 5973 | 4334 | 4672 | 8085 | 10881 | 7237 | 3706 | 4658 | 8523 | 6232 | 4882 | 10238 | 6816 | 5457 | 5364 | 6952 | 6290 | 6067 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | off | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | off |
High Tide | 00:29AM0.82m | 1:15AM0.84m | 2:47AM0.85m | 5:24AM0.86m | 6:53AM0.88m | 7:55AM0.87m | 00:50AM0.59m | |||||||||||||
Low Tide | 1:11PM0.31m | 1:59PM0.24m | 2:41PM0.19m | 3:20PM0.18m | 3:55PM0.19m | 4:26PM0.23m | 1:13AM0.59m | |||||||||||||
— | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — | |
6:01 | — | — | 6:01 | — | — | 6:02 | — | — | 6:04 | — | — | 6:04 | — | — | 6:05 | — | — | 6:06 | — | |
mm | — | — | — | — | 3 | — | — | — | 2 | 11 | 2 | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 15 | 16 | 16 | 16 | 15 | 13 | 14 | 15 | 16 | 13 | 14 | 15 | 13 | 13 | 15 | 13 | 15 | 19 | 16 |
Feels °C | 11 | 12 | 10 | 9 | 8 | 8 | 8 | 10 | 9 | 8 | 0 | 6 | 7 | 9 | 10 | 11 | 8 | 12 | 16 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 14 | SW 15 | SW 14 | — | WSW 13 | WSW 15 | WSW 14 | SW 14 | — | WSW 22 | SW 13 | SW 13 | SW 17 | SW 16 | SW 16 | SW 15 | WSW 16 | WSW 16 | WSW 16 |
3984 | 4943 | 5973 | 4334 | — | 8085 | 10881 | 7237 | 3706 | — | 46 | 6232 | 4882 | 10238 | 6816 | 5457 | 5364 | 6952 | 6290 | 6067 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | S 11 | — | — | WSW 19 | WSW 17 | SSE 11 | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | 426 | — | — | 650 | 3945 | 40 | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | W 6 | WSW 10 | — | — | — | WNW 6 | SW 10 | SW 12 | — | S 9 | — | — | — | — | — | — | — |
— | — | — | 270 | 4672 | — | — | — | 233 | 4658 | 8523 | — | 395 | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 31 | 0 | 202 | 251 | 1689 | 2014 | 2 | 202 | 202 | 251 | 630 | 1689 | 31 | 0 | 0 | 31 | 1 | 0 | 1 | 0 |
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.










