
Surf Forecasts:
Big Rock surf forecast from 5 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 5AM (local time) - 13ft (4.0m), 16s period, SW swell with offshore winds.
- Most powerful swell: Sunday 6 Sep, 8PM (local time) - 15ft (4.5m), 17s period, SW swell with 10,792 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 11AM (local time) - 11ft (3.5m), 16s 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 Monday (Sep 07) at 11AM. The primary swell is predicted to be 3.5m and 16s 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 1.2m 5s period and expected on Monday (Sep 07) at 8PM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Mon 7th Sep) | 11ft (3.5m) 16s |
| Best Surf | 5AM (Tue 8th Sep) | 13ft (4.0m) 16s |
| 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
Alright, let’s have a look at what’s coming up. The window kicks off with a bit of a messy start, but there’s some real quality hiding in there if you’re patient and know what you’re doing.
The first call is for Big Rock – a reef break that’s fairly consistent and exposed to the swell. Water temp is sitting at about 65°F, which is a touch warmer than normal for this time of year. Not a huge deal, but it’s nice.
Saturday the 5th is a write-off. We’ve got rain showers, a cross-on wind at 16 mph, and a bumpy 10ft swell from the WSW with a period of 13 seconds. Combined energy is strong (3003), but the conditions are poor. Don’t bother.
Sunday the 6th is where it starts to turn. Morning sees a clean offshore wind from the SSE at 19 mph, with a 12ft swell from the WSW, period 12 seconds. Energy is up (4291), but the tide might be tricky. It’s marginal. The afternoon cleans up even more – same wind, but the swell shifts to SW and period bumps to 13 seconds, energy jumps to 7143. Still a marginal call, but the wave quality improves. This is a good option for stronger surfers.
Monday the 7th morning is the first real standout. Clear skies, a gentle cross-off breeze from the SE at 9 mph, and a 12ft SW groundswell with a very long period of 16 seconds. Energy is high (6307). This is exceptional for expert surfers – the long period will groom the reef nicely. Afternoon stays clean but the wind picks up to 19 mph – still cross-off, but it drops the score.
Tuesday the 8th is the best of the run. Morning has a 13ft SW swell, period 16 seconds, and a moderate cross-off breeze from the ESE at 12 mph. Energy is massive (8296). Conditions are clean and the reef will hold that size well. This is for experienced surfers only – it’s big, powerful, and lined up. The afternoon is similar but slightly smaller at 12ft with a gentle SE breeze. Both sessions are top-tier.
From Wednesday the 9th onward, the swell drops. Morning still has a 10ft WSW swell with a 16-second period, but the wind is a bit stronger. Afternoon is better with a gentle NE breeze. It’s still good, but not as firing as Tuesday.
Thursday the 10th sees the swell drop to 7ft – still WSW, period 14 seconds. The energy is moderate (1785). Morning is clean but light, afternoon gets a bit cross-on and small. Nothing special.
From Friday the 11th through to Saturday the 19th, it’s a long stretch of poor conditions. Winds are mostly cross-on or onshore, often strong, and the swell is either too big, too messy, or both. There’s a quick look on Monday the 14th morning – a 12ft WSW swell with a gentle NNE breeze, clean, and energy over 5000. That’s another expert session, but it’s a one-off in a bad run.
Wednesday the 16th morning is glassy – no wind, 8ft WSW swell, period 14 seconds. Energy is moderate (2618). That’s a rare clean window, but the swell is a bit smaller.
After that, from Thursday the 17th onward, it’s onshore junk. Big swells but poor quality – 18ft on the 19th, but with strong onshore winds, it’s a mess. That’s more of a kite surfing scene than paddle.
Overall, the clear standout is Tuesday the 8th – morning and afternoon – at Big Rock. Big, clean, powerful SW groundswell with light offshore winds. That’s the one to circle. Monday the 7th morning is also solid. The rest is either marginal or not worth the paddle.
Rusty.
Short Range ForecastSome drizzle, heaviest during Sat night. Warm (max 20°C on Tue afternoon, min 10°C on Sun night). Winds decreasing (fresh winds from the S on Sat night, light winds from the SE by Tue afternoon). | Days 5-7 Weather SummaryMostly dry. Warm (max 20°C on Wed afternoon, min 10°C on Wed morning). Wind will be generally light. | ||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | ||||||||||||||
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 9 | SW 12 | WSW 17 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 15 | WSW 14 | WSW 14 | WSW 15 | WSW 14 | WSW 18 | WSW 16 |
Wave Graph | |||||||||||||||||||
1526 | 4402 | 3378 | 9105 | 6018 | 5268 | 6621 | 8195 | 6917 | 5775 | 4278 | 3800 | 2620 | 1667 | 1644 | 1772 | 1454 | 2273 | 4324 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | cross-off | cross-off | cross-off | cross | off | cross-on | cross-on | on |
High Tide | 5:24AM0.86m | 6:53AM0.88m | 7:55AM0.87m | 00:50AM0.59m | 8:46AM0.83m | 11:34PM0.54m | 9:30AM0.77m | 10:58PM0.54m | 10:08AM0.69m | 10:34PM0.56m | |||||||||
Low Tide | 3:20PM0.18m | 3:55PM0.19m | 4:26PM0.23m | 1:13AM0.59m | 4:50PM0.28m | 2:42AM0.51m | 5:02PM0.34m | 3:34AM0.45m | 4:57PM0.40m | 4:22AM0.40m | |||||||||
— | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — | 6:26 | — | — | 6:26 | — | — | |
6:04 | — | 6:04 | — | — | 6:05 | — | — | 6:06 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | |
mm | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 |
Temp °C | 15 | 15 | 15 | 12 | 14 | 17 | 13 | 15 | 20 | 16 | 15 | 20 | 19 | 15 | 18 | 17 | 18 | 18 | 18 |
Feels °C | 10 | 7 | 7 | 6 | 10 | 12 | 7 | 10 | 16 | 11 | 10 | 17 | 15 | 10 | 16 | 15 | 16 | 16 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 9 | SW 12 | WSW 13 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 15 | WSW 14 | WSW 14 | WSW 15 | WSW 14 | WSW 18 | WSW 16 |
1526 | 4402 | 2519 | 9105 | 6018 | 5268 | 6621 | 8195 | 6917 | 5775 | 4278 | 3800 | 2620 | 1667 | 1644 | 1772 | 1454 | 2273 | 4324 | |
Swell 2 Height (m) Direction Period (s) | WSW 22 | SW 20 | WSW 17 | — | — | — | — | — | — | — | — | NNE 5 | WSW 26 | WSW 24 | WSW 22 | WSW 21 | SW 19 | WSW 13 | — |
46 | 575 | 3378 | — | — | — | — | — | — | — | — | 15 | 65 | 217 | 311 | 302 | 863 | 1106 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SW 26 | — | — | — | — | SSW 11 | S 11 | — |
— | — | — | — | — | — | — | — | — | — | — | 27 | — | — | — | — | 23 | 22 | — | |
Wind waves Height (m) Direction Period (s) | S 8 | — | S 7 | — | — | S 4 | — | — | — | SE 6 | NE 5 | — | NE 4 | NNE 6 | N 6 | NNE 5 | N 4 | — | WNW 5 |
640 | — | 297 | — | — | 20 | — | — | — | 70 | 49 | — | 17 | 77 | 43 | 20 | 10 | — | 125 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 221 | 459 | 64 | 86 | 1 | 0 | 34 | 1 | 1 | 0 | 0 | 13 | 0 | 0 | 44 | 38 | 0 | 53 | 359 |
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.










