Surf Forecasts:
Cobblestones surf forecast from 12 Sep 2026:
- Best quality surf: Monday 14 Sep, 11AM (local time) - 13ft (4.0m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 13 Sep, 8PM (local time) - 13ft (4.0m), 14s period, WSW swell with 6,254 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 11AM (local time) - 13ft (4.0m), 14s 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 Monday (Sep 14) at 11AM. The primary swell is predicted to be 4.0m 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 Cobblestones in the next 16 days are 4.0m 14s and forecast to arrive on Sunday (Sep 13) 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 1.3m 6s period and expected on Friday (Sep 18) at 2AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Mon 14th Sep) | 13ft (4.0m) 14s |
| Best Surf | 11AM (Mon 14th Sep) | 13ft (4.0m) 14s |
| Most Powerful | 8PM (Sun 13th Sep) | 13ft (4.0m) 14s |
Table - best surf conditions forecast for Cobblestones over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what’s coming for Cobblestones over the next couple of weeks.
Right now, there’s a quiet start. The first few days are a total loss—Sunday and Monday give us messy 10ft to 11ft cross-onshore slop with strong winds. Not worth paddling out for. That’s a gap of about 2 days of nothing good.
Things finally turn on Monday the 14th. The morning brings clean 13ft SW groundswell with a 14-second period and light offshore cross-off winds. The water temp is about average for this time of year. The combined swell energy hits 5902 (strong), so there’s serious power. This is for experienced surfers only—13ft is expert territory. Cobblestones is a reef break (Big Island), and with that long-period groundswell, the lines will be grinding deep. Crowd levels are likely, so expect some company.
Tuesday the 15th morning keeps it clean: 10ft SW swell with true offshore ENE wind at 6 mph. Combined energy is still a hefty 4009. Excellent for experienced surfers, with glassy-adjacent conditions.
Now, the big standout is Monday the 21st of September. The morning shows 13ft SW swell with a very long 16-second period, combined energy of 7492 (very strong), and light 3 mph cross-shore wind—essentially glassy. The afternoon is even bigger at 13ft, 16-second period, and 8243 combined energy, though it’s onshore. The morning window is the real gold here. This is deep, powerful groundswell hitting a reef—experts only. Beginners and intermediates stay out. Crowds are possible.
The next standout is Wednesday the 23rd of September morning: 13ft SW groundswell with a massive 18-second period, combined energy reading 10841 (very strong), and light onshore wind. That period is about as long as it gets—the swell will have long lulls, then serious, serious lines. This is for experts only. Too bad the afternoon turns choppy.
The second week also has several clean mornings, like Saturday the 26th and Sunday the 27th, with 11-12ft SW swell, offshore winds, and combined energy around 5000-6000. Solid, consistent options, but not as epic as the 21st or 23rd.
Bottom line: the morning of Monday the 21st of September is the best of the whole run. Clean, powerful, long-period groundswell, light winds. That’s your day.
Stay sharp out there.
- Rusty
Short Range ForecastMostly dry. Warm (max 21°C on Tue afternoon, min 11°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 18mm), heaviest on Fri afternoon. Warm (max 23°C on Wed afternoon, min 12°C on Fri morning). Winds increasing (light winds from the NE on Wed night, strong winds from the S by Fri morning). | ||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | ||||||||||||||
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 | WSW 13 | WSW 14 | WSW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 | WSW 15 | WSW 14 | WSW 13 | WSW 12 | WSW 15 | WSW 15 | WSW 16 |
Wave Graph  | |||||||||||||||||||
 kJ | 3446 | 3186 | 5603 | 5399 | 5891 | 5341 | 4757 | 4009 | 3569 | 2390 | 1401 | 721 | 1297 | 1351 | 902 | 1320 | 4149 | 4468 | 5097 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross | cross-off | cross-off | cross-off | off | cross-on | off | cross-off | cross-off | off | cross | cross | cross-off | cross-off | cross | cross-on |
High Tide | 10:24PM0.61m | 11:00AM0.51m | 10:28PM0.67m | 10:57AM0.43m | 10:43PM0.72m | 9:41AM0.38m | 11:04PM0.76m | 11:28PM0.79m | 11:55PM0.81m | 00:25AM0.81m | |||||||||
Low Tide | 5:12AM0.37m | 3:38PM0.43m | 6:09AM0.37m | 2:41PM0.40m | 7:39AM0.38m | 2:06PM0.35m | 2:02PM0.31m | 2:13PM0.28m | 2:26PM0.27m | ||||||||||
 |  | |  |  | |  |  | | | | | | | | |  | |  | |
 | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:18 | — | — | 6:16 | — | — | 6:16 | — | — |
 | 6:07 | — | 6:08 | — | — | 6:09 | — | — | 6:10 | — | — | 6:10 | — | — | 6:12 | — | — | 6:13 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 8 | 10 | 7 |
Temp °C | 16 | 16 | 17 | 17 | 15 | 17 | 15 | 18 | 21 | 21 | 20 | 23 | 22 | 19 | 19 | 19 | 13 | 12 | 14 |
Feels °C | 12 | 11 | 12 | 14 | 12 | 15 | 11 | 16 | 19 | 18 | 17 | 22 | 21 | 19 | 16 | 16 | 5 | 5 | 6 |
Swell 1 Height (m) Direction Period (s) | WSW 14 | WSW 13 | WSW 14 | WSW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 | WSW 15 | WSW 14 | WSW 13 | NW 6 | W 15 | WSW 15 | WSW 16 |
| kJ | 3446 | 3186 | 5603 | 5399 | 5891 | 5341 | 4757 | 4009 | 3569 | 2390 | 1401 | 721 | 1297 | 1351 | 902 | 107 | 17 | 4468 | 5097 |
Swell 2 Height (m) Direction Period (s) | WSW 19 | WSW 17 | — | — | W 24 | — | — | — | — | SE 7 | S 13 | SW 16 | S 12 | S 11 | WSW 18 | — | — | W 15 | — |
| kJ | 274 | 798 | — | — | 11 | — | — | — | — | 67 | 404 | 367 | 134 | 37 | 216 | — | — | 68 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SW 16 | — | ESE 8 | S 11 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 310 | — | 6 | 20 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SE 4 | — | NNE 4 | N 5 | N 4 | NNW 4 | NNW 5 | WSW 12 | WSW 15 | — | — |
| kJ | — | — | — | — | — | — | — | — | 31 | — | 29 | 15 | 4 | 16 | 59 | 1320 | 4149 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 201 | 359 | 359 | 20 | 0 | 1 | 0 | 0 | 1 | 0 | 28 | 0 | 0 | 53 | 53 | 53 | 64 | 89 | 630 |
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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