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
Right, let’s have a proper look at what’s coming down the line.
The forecast is a bit of a slow burner, with nothing worth paddling out for in the first day or two. The first real chance of a wave hits on Monday, 14 September, and things start to build from there.
Monday 14 September – Cobblestones is the only show in town. Early morning sees a solid 13ft swell from the SW with a long 14-second period. The wind is a light cross-offshore SE breeze, so it’s clean and lined up. This is proper groundswell energy (combined energy of 5902), and with that size and period, it’s going to be pushing hard. This is only for experienced surfers – 13ft is not beginner territory. The water temp is 64°, which is about average for the time of year. The afternoon drops a touch to 11ft but stays clean.
Tuesday 15 September – Another morning session at Cobblestones is looking good. 10ft of SW groundswell with a 14-second pulse, and a light offshore ENE wind at 6 mph. Glassy, clean, proper shape. The energy is still solid (4009). Afternoon winds swing a bit cross-shore, so morning is the pick.
Saturday 20 September – This is the standout. Cobblestones early on Saturday morning is looking like the best session of the whole run. The swell jumps to 15ft from the SW with a very long 16-second period. Wind is almost nothing – glassy, from the NNW at just 3 mph. That’s about as perfect as it gets for a big, powerful reef break. Combined energy is a whopping 9225. This is expert-only stuff, but for those who can handle it, it will be unforgettable.
Monday 21 & Tuesday 22 September – The swell stays up around 11ft to 13ft, with long 16-second periods. Winds are cross-offshore or light, keeping the surface clean. The quality remains high for experienced surfers.
Thursday 24 September – This one is massive. Cobblestones is looking at an 18ft swell from the WSW with an 18-second period. That’s a huge amount of water moving, and the combined energy reading is 18995. The forecast note says the swell might be too big for this break, and I’d agree – that’s only for the most expert, and even then, it’s sketchy. The wind is cross-shore, so not ideal, but the raw power is there.
After the 24th, the size drops off gradually through the end of September, with smaller 6ft to 7ft swells and clean conditions, but nothing that matches the earlier week’s intensity.
In short: the best bet is Saturday 20 September at Cobblestones – that glassy 15ft, 16-second groundswell is the one to circle on the calendar.
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) | 879 | 201 | 359 | 359 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 28 | 0 | 0 | 53 | 53 | 53 | 53 | 201 |
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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