Surf Forecasts:
Cobblestones surf forecast from 29 Aug 2026:
- Best quality surf: Saturday 29 Aug, 11PM (local time) - 10ft (3.0m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 30 Aug, 5AM (local time) - 11ft (3.5m), 18s period, SW swell with 7,333 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 2PM (local time) - 8ft (2.5m), 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 Saturday (Aug 29) at 2PM. The primary swell is predicted to be 2.5m and 17s period with a secondary swell of 0.1m and 9s. 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 3.5m 18s and forecast to arrive on Sunday (Aug 30) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Saturday (Aug 29) at 11AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Sat 29th Aug) | 8ft (2.5m) 17s |
| Best Surf | 11PM (Sat 29th Aug) | 10ft (3.0m) 17s |
| Most Powerful | 5AM (Sun 30th Aug) | 11ft (3.5m) 18s |
Table - best surf conditions forecast for Cobblestones over the next 16 days.
The Lowdown
Alright, let’s break that down in feet and Fahrenheit for the crew who think that way.
Cobblestones is a reef break that’s exposed to a SSW swell. The water temp is about 65°, which is a touch warmer than usual for this time of year – you’ll feel it. The next week and a half is all about picking the right windows because we’ve got a lot of swell but the wind is going to be a real mood.
Kicking off Saturday the 29th of August – morning is cross-off with a 7ft SW groundswell at a very long 16 seconds. That’s proper energy, around 3510 units of power. The morning is a bit marginal, but the afternoon cleans right up: 10ft SW, 17-second periods, and offshore east wind. That’s exceptional for an expert surfer – big, clean, and meaty. Sunday the 30th is the best of the first week: 12ft SW swell, still 17 seconds, and a light NE breeze keeping it clean. This is the standout – big, clean, and the reef will be handling that long groundswell perfectly. Not for the faint of heart.
Monday the 31st through Thursday the 3rd of September turns ugly with onshore winds and rain. The swell is still there – over 8ft at times – but it’s choppy and lumpy. Not worth paddling out. Then from Friday the 4th into the 5th of September, it goes huge – up to 21ft of SW swell and 12,891 wave energy. That’s massive, but it’s also blown out by fresh onshore wind. At that size with that wind, you’d want a kite, not a surfboard.
The tide starts to turn on Sunday the 6th of September with a 17ft SW groundswell and a gentle cross-on breeze – still a bit messy, but the reef will take it. Monday the 7th of September has a 13ft SW groundswell at 16 seconds and a light breeze – worth a look for the brave crew. Then Wednesday the 9th of September morning is a gem: 10ft WSW swell, 14 seconds, and glassy offshore ENE wind at just 3 mph. The ocean will be smooth, the waves will be lined up. That’s your late-period standout. Thursday the 10th of September morning also has a solid 13ft WSW groundswell at 16 seconds with cross-off wind – another good window.
The second week gets messy again, with 18ft and bigger swells on the 12th of September, but onshore wind spoils it. Stick to the 9th and 10th of September for the cleanest late windows.
Cobblestones is a reef, so watch the tide. Crowds can show up on the good days. At anything over 8ft, this is expert territory. The best calls: Sunday the 30th of August for a clean, big session, and Wednesday the 9th of September for late glass.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Mon night. Very mild (max 19°C on Sat afternoon, min 12°C on Sat morning). Winds increasing (calm on Sun night, fresh winds from the SSW by Mon afternoon). | Days 4-6 Weather SummaryModerate rain (total 12mm), heaviest on Thu night. Very mild (max 16°C on Wed afternoon, min 11°C on Thu night). Winds increasing (light winds from the SW on Tue morning, strong winds from the SSW by Thu night). | ||||||||||||||||||||
Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | |||||||||||||||
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 16 | SW 17 | SW 17 | SW 17 | WSW 16 | WSW 16 | WSW 17 | WSW 16 | WSW 16 | WSW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 14 | SW 14 | WSW 14 | SW 13 | SW 13 | SW 13 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2325 | 5452 | 6314 | 6471 | 4844 | 3822 | 3909 | 3192 | 5120 | 3800 | 3966 | 3902 | 3916 | 3676 | 4864 | 4076 | 4225 | 5251 | 5091 | 4401 | 4178 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 10:11AM0.79m | 11:06PM0.63m | 10:54AM0.71m | 11:15PM0.67m | 11:39AM0.61m | 11:33PM0.73m | 12:35PM0.51m | 11:57PM0.78m | 00:29AM0.82m | 1:15AM0.84m | 2:47AM0.85m | ||||||||||
Low Tide | 5:13PM0.41m | 4:35AM0.46m | 5:13PM0.46m | 5:41AM0.44m | 4:55PM0.49m | 7:07AM0.42m | 3:46PM0.49m | 10:34AM0.40m | 1:11PM0.31m | 1:59PM0.24m | |||||||||||
 | |  | | |  |  |  |  | | | |  | |  |  | | | | |  | |
 | 6:43 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — |
 | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:02 | — |
mm | — | — | — | — | — | — | — | 1 | 2 | — | — | — | — | — | 1 | 2 | 1 | 8 | — | — | — |
Temp °C | 16 | 19 | 15 | 18 | 19 | 17 | 18 | 18 | 14 | 14 | 14 | 15 | 15 | 16 | 15 | 16 | 16 | 16 | 11 | 13 | 13 |
Feels °C | 11 | 17 | 12 | 17 | 18 | 18 | 14 | 12 | 7 | 9 | 9 | 11 | 11 | 12 | 12 | 11 | 9 | 8 | 2 | 6 | 7 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 17 | SW 17 | SW 17 | WSW 16 | WSW 16 | WSW 17 | WSW 16 | WSW 16 | WSW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 14 | SW 14 | — | — | SW 13 | SW 13 | SW 14 |
| kJ | 2325 | 5452 | 6314 | 6471 | 4844 | 3822 | 3909 | 3192 | 5120 | 3800 | 3966 | 3902 | 3916 | 3676 | 4864 | 4076 | — | — | 5091 | 4401 | 4178 |
Swell 2 Height (m) Direction Period (s) | SW 19 | — | — | — | — | WSW 20 | — | — | — | — | — | — | — | — | — | S 13 | — | — | — | — | SSE 12 |
| kJ | 1185 | — | — | — | — | 441 | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | 14 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SE 5 | SE 5 | SE 6 | — | — | — | WNW 4 | WSW 7 | — | — | — | — | — | — | — | — | WSW 14 | SW 13 | — | — | — |
| kJ | 60 | 46 | 38 | — | — | — | 21 | 346 | — | — | — | — | — | — | — | — | 4225 | 5251 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 35 | 2 | 306 | 359 | 2 | 2 | 2 | 64 | 359 | 359 | 35 | 359 | 359 | 359 | 2004 | 35 | 35 |
Best forecast wave conditions in Margaret River | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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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.
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