Surf Forecasts:
Cobblestones surf forecast from 15 Aug 2026:
- Best quality surf: Monday 17 Aug, 8PM (local time) - 16ft (5.0m), 17s period, WSW swell with onshore winds.
- Most powerful swell: Monday 17 Aug, 8PM (local time) - 16ft (5.0m), 17s period, WSW swell with 13,376 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 5PM (local time) - 8ft (2.5m), 13s 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 15) at 5PM. The primary swell is predicted to be 2.5m and 13s period. 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 5.0m 17s and forecast to arrive on Monday (Aug 17) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.1m 6s period and expected on Monday (Aug 17) at 8AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Sat 15th Aug) | 8ft (2.5m) 13s |
| Best Surf | 8PM (Mon 17th Aug) | 16ft (5.0m) 17s |
| Most Powerful | 8PM (Mon 17th Aug) | 16ft (5.0m) 17s |
Table - best surf conditions forecast for Cobblestones over the next 16 days.
The Lowdown
Alright, this is Rusty. Let’s get into it.
We’ve got a solid run of swell coming through for Cobblestones, a serious reef setup, but you’ve got to pick your moments. The water is sitting at 66°, which is a touch warmer than usual for this time of year. That’s a nice bonus.
The weekend kicks off Saturday, August 15, with a clean 8 ft swell from the WSW, period around 14 seconds. The wind is a moderate cross-off, so it’ll be a bit textured but surfable. The wave energy is pumping hard (2856). It’s not perfect, but it’s a start.
Sunday the 16th is a step up in size – 10 ft from the WSW, but the period drops a bit to 15 seconds. The wind is a fresh cross-off, keeping it from being a total loss, but the conditions are marginal. The energy is very strong (3953).
Monday the 17th is a write-off. Strong onshore winds, rain, and a messy 13 ft to 16 ft swell. Forget it.
Tuesday the 18th has a massive 15 ft swell from the WSW with a long 16-second period. The energy is through the roof (12652), but the wind is a moderate cross-onshore, making it choppy. This is big, powerful water – experts only, and even then, it’s a battle.
Wednesday the 19th and Thursday the 20th are similar stories: big, unruly swell with onshore winds. Not great.
Now, here’s the standout. Friday, August 21, morning. The swell drops to a much more manageable 12 ft from the SW, with a solid 14-second period. The wind switches to a light offshore from the NE. That is the golden ticket. Clean, lined-up surf at Cobblestones (reef) with that long-period SW groundswell. The energy is still strong (5115), and with the offshore breeze, it’s going to be glassy perfection. This is the one to circle on the calendar.
Saturday the 22nd and Sunday the 23rd fade a bit in size, but Sunday morning the 23rd is worth a mention. Glassy conditions with a 10 ft, 15-second swell from the SW. Clean as a whistle for the experienced crew.
The following week gets chaotic. Monday the 24th is blown out. Tuesday the 25th is a monster – 21 ft from the SW – but the comment says it’s too big for this break. That’s a no-go for paddle surfing. The wave energy is insane (over 15000). Honestly, that setup would be more interesting for a kite surfer than a paddle surfer. Stay away.
Wednesday the 26th and Thursday the 27th are still big and messy, though Thursday morning the 27th shows a clean 8 ft with light cross-off winds.
The long-range window (August 29-30) shows another massive, stormy pulse. It’s too far out to trust, and the wind forecast is ugly.
Best on offer: Friday, August 21, morning. That’s your call to arms. Clean 12 ft SW groundswell with a light offshore. Cobblestones will be a gem. Expect a crowd, as this spot can get busy when it’s good.
Rusty.
Short Range ForecastModerate rain (total 16mm), heaviest on Mon morning. Very mild (max 19°C on Sun afternoon, min 13°C on Mon afternoon). Winds increasing (light winds from the NNE on Sat night, strong winds from the WSW by Mon afternoon). | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Tue afternoon. Very mild (max 16°C on Tue night, min 14°C on Tue morning). Mainly fresh winds. | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
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 14 | SW 13 | WSW 13 | WSW 15 | WSW 14 | WSW 15 | W 17 | WSW 12 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 16 | WSW 16 | WSW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2856 | 2209 | 1528 | 3866 | 3388 | 3530 | 10359 | 7537 | 10646 | 9796 | 8970 | 6002 | 7582 | 10265 | 10267 | 7395 | 5812 | 5070 | 5115 | 4764 | 2436 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross-off | cross-off | cross-off | on | on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | cross-on | cross-off | off | on | off |
High Tide | 10:47AM0.72m | 00:00AM0.59m | 10:48AM0.62m | 11:55PM0.64m | 10:00AM0.54m | 00:10AM0.70m | 00:37AM0.74m | 1:15AM0.78m | 2:08AM0.81m | 3:39AM0.84m | |||||||||||
Low Tide | 6:01PM0.46m | 5:05AM0.52m | 5:10PM0.47m | 6:30AM0.52m | 4:12PM0.44m | 3:35PM0.38m | 3:25PM0.34m | 3:31PM0.30m | 3:41PM0.29m | ||||||||||||
 |  |  | | |  |  | | |  |  | | | |  | | |  | | | | |
 | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — |
 | — | 5:49 | — | — | 5:50 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — |
mm | — | — | — | — | — | 1 | 11 | 3 | 1 | — | 1 | 4 | 2 | 1 | — | — | — | — | — | — | — |
Temp °C | 17 | 17 | 17 | 17 | 19 | 19 | 18 | 14 | 14 | 14 | 15 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 16 | 15 |
Feels °C | 12 | 13 | 16 | 11 | 14 | 14 | 11 | 5 | 5 | 10 | 10 | 11 | 12 | 12 | 12 | 10 | 10 | 12 | 12 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | WSW 14 | SW 13 | WSW 13 | WSW 15 | WSW 14 | WSW 15 | — | SW 18 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 16 | WSW 16 | WSW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 |
| kJ | 2856 | 2209 | 1528 | 3866 | 3388 | 3530 | — | 1839 | 10646 | 9796 | 8970 | 6002 | 7582 | 10265 | 10267 | 7395 | 5812 | 5070 | 5115 | 4764 | 2436 |
Swell 2 Height (m) Direction Period (s) | — | — | WSW 16 | SW 24 | SW 22 | SW 20 | — | — | — | SW 15 | — | — | — | — | — | — | — | — | — | — | SW 16 |
| kJ | — | — | 1390 | 87 | 558 | 1422 | — | — | — | 2856 | — | — | — | — | — | — | — | — | — | — | 1904 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | N 4 | — | N 5 | N 6 | NNW 6 | W 17 | WSW 12 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 8 | — | 61 | 212 | 141 | 10359 | 7537 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 53 | 0 | 0 | 165 | 159 | 53 | 1689 | 359 | 359 | 179 | 201 | 201 | 201 | 2 | 2 | 2 | 2 | 0 | 0 | 2 | 0 |
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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