
Surf Forecasts:
Cobblestones surf forecast from 3 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 12,820 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 11PM (local time) - 15ft (4.5m), 17s period with SW swell.
Best Forecast Surf Conditions for Cobblestones this week:
The surf forecast for Cobblestones over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 06) at 11PM. The primary swell is predicted to be 4.5m and 17s period with a secondary swell of 0.5m and 11s. Another secondary swell of 1.3m and 8s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Cobblestones 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 0.7m 4s period and expected on Wednesday (Sep 09) at 2PM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sun 6th Sep) | 15ft (4.5m) 17s |
| 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 Cobblestones over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at the waves ahead. We’ve got a single spot lighting up the charts for the next couple of weeks, so let’s get straight into it.
The story starts with a bang but with some messy conditions. We're looking at a solid pulse of swell, but the wind is going to be a bit of a battle for the first few days. The real gold is going to be next Tuesday morning, the 8th of September, so keep that date circled.
Right now, for Thursday morning, the 3rd, we’ve got a big 13-foot SW groundswell rolling in with a long 15-second period. The energy is pumping at 6562, which is serious power, but the wind is howling from the NW at 16 mph and it's cross-onshore. It’s going to be a choppy, lumpy mess out there. That afternoon it gets worse with 22 mph winds, so chalk this day off.
Friday the 4th is another big day for size – 16-foot SW swell in the morning – but the wind is still a problem. The afternoon might be the first window we get, with 15 feet of SW swell and the wind swinging onshore. It’s a marginal call and the tide might be funky, but it’s not a total write-off.
Saturday and Sunday, the 5th and 6th, are mostly no-gos with rain and strong cross-shore winds. A bit of a frustrating start to the run.
Now, here’s where it gets good. Monday morning, the 7th of September, we start to see a change. The wind drops to a gentle breeze from the S, and with a 13-foot SW groundswell with a 16-second period, the energy is still huge at 7263. It’s cross-shore, but with that much size and long period, the lineup at Cobblestones is going to be a powerful, heaving reef. It’s an advanced-only affair, but for the crew that can handle it, this is a proper paddle out.
Tuesday the 8th is the absolute standout of this whole forecast. Tuesday morning is where you want to be in the water. The wind goes light and offshore from the ESE at just 6 mph, cleaning up the 13-foot SW groundswell. The period stretches to a massive 18 seconds, and the energy is off the charts at 10815. This is as good as it gets – a long-period, groundswell hitting a reef with perfect offshore wind. It’s a world-class window for the experts, and you will want to be there early. The afternoon holds clean but with a light cross-shore breeze.
Wednesday the 9th is still solid but the wind turns a little less friendly, and the swell starts to drop a touch. From the 10th through the 11th, we get a dip in size and quality, with smaller 8–8-foot swells and moderate winds. Not a write-off, but nothing compared to what’s to come.
Then, just when you think it’s over, Saturday the 12th brings another massive pulse. We’re talking 16 feet of WSW swell with a 16-second period, and a combined energy reading of 11914 – that’s a hell of a lot of water moving. But, the wind is back on it, cross-onshore from the WNW, so it’ll be choppy again. A day for the jet ski or maybe just watching from the cliff.
Sunday the 13th and Monday the 14th see the size drop back to the 12–15-foot range with onshore winds, keeping it marginal.
Looking into the second week, Wednesday the 16th brings a smaller, cleaner setup. Actually, Wednesday morning looks decent with a solid offshore breeze from the NE and an 12-foot SSW swell, though the period drops to 10 seconds. It’s clean, but not the power of that 8th. The energy is at 3331, which is moderate.
After that, the swell fades to around 5 to 7 feet for the last few days of the window. It’s clean but small, with offshore winds on the 17th and 18th, making for a good end to the run if you’ve got a longboard or a fish.
So, to wrap it up: The real deal is Tuesday the 8th of September. The water is sitting at 65°, which is a touch warmer than normal for this time of year, so the rubber might be a little thinner. That morning is a genuine standout. The weekend after that has size but messy conditions. Everything else is a wait-and-see game for clean windows.
Signing off, Rusty.
Short Range ForecastModerate rain (total 11mm), heaviest on Sat afternoon. Very mild (max 16°C on Thu morning, min 13°C on Fri afternoon). Winds increasing (light winds from the NW on Thu morning, near gales from the S by Sat night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Tue afternoon, min 10°C on Tue morning). Winds decreasing (fresh winds from the SSE on Sun morning, light winds from the ESE by Tue morning). | ||||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | |||||||||||||||
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) | SW 15 | WSW 14 | WSW 10 | SW 13 | SW 14 | SW 14 | WSW 14 | WSW 13 | SW 12 | WSW 13 | SW 17 | SW 17 | SW 16 | SW 16 | SW 15 | SW 16 | SW 18 | WSW 16 | WSW 16 | WSW 15 | WSW 15 |
Wave Graph | |||||||||||||||||||||
6562 | 5956 | 5018 | 8632 | 8591 | 7811 | 4889 | 5385 | 7667 | 4839 | 4770 | 10558 | 7263 | 6128 | 5669 | 8803 | 10815 | 6917 | 5559 | 4551 | 3282 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | cross-on | on | cross-on | cross-on | cross-on | cross | cross | cross | cross-off | cross | cross | cross-off | cross-off | cross | off | cross-off | cross-on | off |
High Tide | 1:15AM0.84m | 2:47AM0.85m | 5:24AM0.86m | 6:53AM0.88m | 7:55AM0.87m | 00:50AM0.59m | 8:46AM0.83m | 11:34PM0.54m | |||||||||||||
Low Tide | 1:11PM0.31m | 1:59PM0.24m | 2:41PM0.19m | 3:20PM0.18m | 3:55PM0.19m | 4:26PM0.23m | 1:13AM0.59m | 4:50PM0.28m | 2:42AM0.51m | ||||||||||||
6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — | |
— | 6:01 | — | — | 6:02 | — | — | 6:04 | — | — | 6:04 | — | — | 6:05 | — | — | 6:06 | — | — | 6:06 | — | |
mm | — | — | 3 | — | — | — | 2 | 3 | 3 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 16 | 16 | 15 | 13 | 14 | 15 | 16 | 13 | 15 | 15 | 12 | 13 | 16 | 13 | 14 | 18 | 16 | 15 | 18 | 17 |
Feels °C | 11 | 9 | 8 | 8 | 8 | 9 | 9 | 9 | 3 | 7 | 7 | 8 | 10 | 11 | 8 | 11 | 15 | 13 | 10 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 15 | WSW 14 | SW 18 | SW 13 | SW 14 | SW 14 | WSW 14 | — | WSW 22 | WSW 13 | SW 12 | SW 17 | SW 16 | SW 16 | SW 15 | SW 16 | SW 18 | WSW 16 | WSW 16 | WSW 15 | WSW 15 |
6562 | 5956 | 392 | 8632 | 8591 | 7811 | 4889 | — | 46 | 4839 | 3986 | 10558 | 7263 | 6128 | 5669 | 8803 | 10815 | 6917 | 5559 | 4551 | 3282 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | WSW 21 | WSW 18 | — | S 12 | — | — | SW 19 | SW 17 | SSE 10 | — | — | SSE 10 | — | — | — | — | W 26 | SW 26 |
— | — | — | 150 | 1707 | — | 511 | — | — | 855 | 4770 | 86 | — | — | 9 | — | — | — | — | 14 | 26 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | S 15 | — | — | — | — | S 13 | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | 113 | — | — | — | — | 13 | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | WNW 6 | WSW 10 | — | — | — | — | WSW 13 | SW 12 | S 9 | SSE 8 | — | — | — | — | — | — | — | — | — | — |
— | 214 | 5018 | — | — | — | — | 5385 | 7667 | 575 | 376 | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 201 | 301 | 688 | 2165 | 2 | 201 | 201 | 201 | 753 | 1689 | 89 | 0 | 0 | 31 | 0 | 0 | 0 | 0 | 16 | 2 | 0 |
Best forecast wave conditions in Margaret River | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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Information about the Cobblestones Surf forecast
The above surf forecast table for Cobblestones provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Cobblestones can be found by selecting the local surf guide option on the grey menu. Our Cobblestones 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 (Cobblestones) 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 Cobblestones 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.
Cobblestones 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.










