Surf Forecasts:
Big Rock surf forecast from 24 Jul 2026:
- Best quality surf: Tuesday 28 Jul, 2AM (local time) - 10ft (3.0m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 26 Jul, 5PM (local time) - 18ft (5.5m), 14s period, SW swell with 11,023 kJ wave energy.
- Next surfable swell (1★+): Tuesday 28 Jul, 2AM (local time) - 10ft (3.0m), 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 Tuesday (Jul 28) at 2AM. The primary swell is predicted to be 3.0m and 14s period with a secondary swell of 0.1m and 24s. 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 5.5m 14s and forecast to arrive on Sunday (Jul 26) at 5PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Wednesday (Jul 29) at 8AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Tue 28th Jul) | 10ft (3.0m) 14s |
| Best Surf | 2AM (Tue 28th Jul) | 10ft (3.0m) 14s |
| Most Powerful | 5PM (Sun 26th Jul) | 18ft (5.5m) 14s |
Table - best surf conditions forecast for Big Rock over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s talk Big Rock. This is a run where the swell gets serious, and the breaks will sort the men from the boys.
We kick off Saturday the 25th with a bit of a lumpy start. 1.7m of WSW swell at 12 seconds, but a fresh north wind puts a chop on it. Water temp’s about 66°, just a hint warmer than average.
Sunday the 26th goes off the rails – 5.5m of SW groundswell at 14 seconds, but the wind is howling cross-onshore. It’s a mess. Save your energy.
Monday the 27th cleans up nicely. Swell drops to 3.5m, and the wind swings light cross-offshore from the SSE. Clean conditions for the experienced crowd. The energy is strong out there.
Tuesday the 28th is your first real gem. Morning has 3.0m SW groundswell with a light cross-off. But the afternoon is glassy – dead calm, with 2.5m of long-period SW swell. That’s as good as it gets for first-week conditions. Pristine reef waves. Crowds can show when it’s like this, so get in early.
Wednesday the 29th and Thursday the 30th stay clean with light breezes and 1.8m to 2.2m of very long-period groundswell (16–17 seconds). Lovely shaped waves, but longer waits between sets.
Friday the 31st gets wind-affected again. Not worth it.
The first weekend of August is smaller but clean. 1.3m to 1.6m of long-period swell on Sunday the 2nd afternoon with light winds – a nice longboard session.
Next week starts ugly. Monday the 3rd through Tuesday the 4th brings strong cross-onshore winds and big, lumpy surf. Wednesday and Thursday the 5th and 6th see the biggest swell of the run – 5.5m at 17–18 seconds, but it’s blown out by near gale winds.
Then, the big standout: Saturday the 8th morning. 5.0m of WSW swell, light cross-off from the NE, and clean conditions. This is heavy, expert-only territory. Sunday the 9th morning is glassy with 4.5m. If you’re a big-wave charger, that Saturday morning is your window. For most people, the best all-around session is Tuesday the 28th afternoon – perfectly clean, solid, and manageable.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Sat night. Very mild (max 19°C on Sat night, min 13°C on Sat night). Winds decreasing (strong winds from the WSW on Sat night, light winds from the ESE by Mon night). | Days 4-6 Weather SummarySome drizzle, heaviest during Thu night. Very mild (max 17°C on Thu night, min 11°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | |||||||||||||||
AM | 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) | WSW 12 | WSW 13 | W 7 | SW 12 | SW 14 | SW 13 | SW 12 | SW 12 | SW 14 | SW 14 | SW 14 | SW 13 | SW 17 | SW 16 | SW 16 | SW 14 | SW 14 | SW 17 | SW 16 | SW 18 | SW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 937 | 390 | 859 | 6731 | 11023 | 5989 | 3505 | 2918 | 3781 | 3495 | 2521 | 1619 | 1415 | 2354 | 1871 | 1186 | 1863 | 5064 | 3252 | 8249 | 6021 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | on | cross-on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | on | cross-on | cross-off |
High Tide | 6:59AM1.00m | 7:34AM1.04m | 8:09AM1.06m | 8:45AM1.06m | 9:21AM1.03m | 9:58AM0.98m | 1:42AM0.62m | ||||||||||||||
Low Tide | 4:52PM0.31m | 5:06PM0.31m | 5:20PM0.32m | 5:34PM0.33m | 5:50PM0.35m | 6:06PM0.37m | 6:21PM0.40m | 2:31AM0.62m | |||||||||||||
 |  |  | | |  |  | | | |  |  | | | | | | | |  |  | |
 | 7:18 | — | — | 7:16 | — | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | — | 7:13 | — | — | 7:13 | — | — |
 | — | 5:35 | — | — | 5:36 | — | — | 5:36 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:38 | — |
mm | — | — | 2 | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | 1 | — | 2 | 5 |
Temp °C | 17 | 18 | 19 | 14 | 15 | 14 | 14 | 14 | 13 | 13 | 15 | 14 | 13 | 14 | 15 | 15 | 16 | 17 | 17 | 17 | 13 |
Feels °C | 11 | 12 | 11 | 4 | 7 | 8 | 9 | 9 | 9 | 11 | 12 | 12 | 9 | 10 | 12 | 12 | 13 | 12 | 14 | 12 | 7 |
Swell 1 Height (m) Direction Period (s) | WSW 12 | SW 11 | SW 16 | — | SW 14 | SW 13 | SW 12 | SW 12 | SW 14 | SW 14 | SW 14 | SW 13 | SW 12 | SW 16 | SW 16 | SW 14 | SW 14 | SW 17 | SW 16 | SW 18 | SW 16 |
| kJ | 937 | 341 | 353 | — | 11023 | 5989 | 3505 | 2918 | 3781 | 3495 | 2521 | 1619 | 959 | 2354 | 1871 | 1186 | 1863 | 5064 | 3252 | 8249 | 6021 |
Swell 2 Height (m) Direction Period (s) | SW 17 | WSW 13 | — | — | — | — | — | W 24 | SW 24 | SW 21 | SW 19 | SW 17 | SW 17 | NNE 4 | SW 22 | SW 20 | SW 19 | — | SW 21 | — | — |
| kJ | 106 | 390 | — | — | — | — | — | 12 | 22 | 224 | 715 | 1118 | 1415 | 3 | 231 | 890 | 1365 | — | 1796 | — | — |
Swell 3 Height (m) Direction Period (s) | — | SW 16 | — | — | — | — | — | — | — | — | — | — | — | — | S 16 | SW 16 | N 5 | — | — | — | — |
| kJ | — | 219 | — | — | — | — | — | — | — | — | — | — | — | — | 5 | 508 | 12 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | N 5 | NNW 6 | W 7 | SW 12 | — | — | — | — | — | — | — | — | NE 4 | — | NE 5 | — | — | — | NNE 4 | — | — |
| kJ | 55 | 138 | 859 | 6731 | — | — | — | — | — | — | — | — | 7 | — | 7 | — | — | — | 15 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 144 | 159 | 474 | 610 | 1689 | 20 | 20 | 20 | 0 | 0 | 0 | 0 | 15 | 0 | 0 | 15 | 0 | 53 | 251 | 359 | 512 |
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.
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