Surf Forecasts:
Cobblestones surf forecast from 18 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 5AM (local time) - 16ft (5.0m), 15s period, WSW swell with onshore winds.
- Most powerful swell: Wednesday 26 Aug, 8AM (local time) - 16ft (5.0m), 17s period, WSW swell with 14,218 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 11PM (local time) - 13ft (4.0m), 15s 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 Thursday (Aug 20) at 11PM. The primary swell is predicted to be 4.0m and 15s 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 Wednesday (Aug 26) at 8AM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Thu 20th Aug) | 13ft (4.0m) 15s |
| Best Surf | 5AM (Wed 26th Aug) | 16ft (5.0m) 15s |
| Most Powerful | 8AM (Wed 26th Aug) | 16ft (5.0m) 17s |
Table - best surf conditions forecast for Cobblestones over the next 16 days.
The Lowdown
Alright, folks, Rusty here. We’ve got a solid run of swell on the way, but it’s not going to be an easy ride for the whole stretch. The big story is the consistent, powerful SW groundswell, but it’s going to come with a lot of wind in the early days.
The first real window of opportunity kicks off on the morning of Thursday, August 21st. The standout morning is looking like Friday, August 22nd. That’s the one you want to circle. We’ve got a 16ft swell from the WSW, but the conditions are absolute trash with a strong onshore wind. The combined energy is massive at 9915 (moderate to strong wave energy). The water temperature is 67°, which is a touch warmer than normal for this time of year.
Forget the first couple of days. Thursday the 21st is where it starts to get interesting. The morning sees the swell dropping a touch to 13ft from the WSW, but the wind swings light and onshore. It’s still a bit messy, but it's a step up. The real gold is Friday morning, August 22nd. We’ve got an 12ft SSW groundswell with a very long 15-second period, and the wind is glassy, absolutely glassy, from the NNE. That’s a rare combination. The combined energy is 5680 (moderate wave energy). Cobblestones is a reef break, which is perfect for this long-period groundswell. It’s an advanced break, and it’s consistent, so expect a few others who know the score. The crowds are listed as “sometimes,” so you might have company, but for a wave this clean, it’s worth it.
The surf stays solid through the weekend, but the wind picks up again, making it choppy and cross-onshore. The swell drops to 10ft on Saturday with a 16-second period, but it’s messy. Sunday drops to 8ft, but the wind is even stronger.
Monday, August 25th, brings a change. The wind goes light cross-offshore from the NNE, and the swell is a solid 10ft from the SW with a 13-second period. The combined energy is 3041 (moderate wave energy). The morning is described as “clean” and excellent for experienced surfers. This is a good session, but the swell is still big enough that beginners should sit this one out.
The middle of the week, from August 26th to 28th, is a write-off. The wind is howling onshore again, with a 16ft swell on the 26th that’s just blown out. The combined energy hits 13858 (strong to very strong wave energy), but it’s a mess.
The second week starts to look promising again. On Friday, August 29th, the morning is clean with a light cross-offshore breeze from the ESE. The swell is down to 6ft from the SSW with a 12-second period, and the combined energy is 1990 (moderate wave energy). That afternoon is also clean, with a 6ft SSW swell. Both are excellent for experienced surfers.
Saturday, August 30th, is another standout. The morning is glassy, with a light cross-offshore from the NNE. The swell is 4ft from the WSW with a very long 17-second period, and the combined energy is 1551 (moderate wave energy). That’s a long-period groundswell, perfect for a reef like Cobblestones. It’s going to be clean and lined up.
Sunday, August 31st, the morning is clean again with a light cross-offshore from the NNW. The swell is back up to 10ft from the WSW with a 16-second period, and the combined energy is 4184 (moderate wave energy). Another excellent session for experienced surfers.
The last day of the forecast, Thursday, September 4th, shows a clean morning with a light cross-offshore from the NNE. The swell is 8ft from the WSW with an 11-second period, and the combined energy is 2091 (moderate wave energy). The afternoon is also clean with an 8ft WSW swell. A solid way to finish the stretch.
The one true standout is the Friday morning, August 22nd, with the glassy conditions and the long-period groundswell. The other top pick is the Saturday morning, August 30th, with the 4ft, 17-second groundswell and glassy wind. Both are on the reef, so they’ll handle the long period beautifully.
Rusty.
Short Range ForecastMostly dry. Very mild (max 16°C on Wed morning, min 12°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Sat night. Very mild (max 15°C on Sat morning, min 11°C on Mon morning). Winds decreasing (fresh winds from the SSW on Sat night, light winds from the ESE by Sun night). | ||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | |||||||||||||||
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 15 | WSW 16 | WSW 16 | WSW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 16 | SW 16 | SW 14 | SW 13 | SW 16 | SW 14 | SW 13 | SW 13 | SW 12 | WSW 10 | WSW 14 | WSW 14 |
Wave Graph | |||||||||||||||||||||
9915 | 10770 | 10064 | 7197 | 7196 | 6573 | 5538 | 5538 | 3659 | 4123 | 3283 | 2506 | 2904 | 5596 | 4401 | 3041 | 2075 | 1082 | 683 | 2848 | 6481 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | cross-on | cross-off | glassy | cross-on | cross-off | cross-on | cross-on | on | cross-on | cross-on | cross-off | cross-off | cross | cross-off | cross | cross | on |
High Tide | 1:15AM0.78m | 2:08AM0.81m | 3:39AM0.84m | 5:28AM0.87m | 6:35AM0.90m | 7:24AM0.91m | |||||||||||||||
Low Tide | 3:25PM0.34m | 3:31PM0.30m | 3:41PM0.29m | 3:54PM0.28m | 4:05PM0.29m | 4:17PM0.29m | 4:29PM0.31m | ||||||||||||||
6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — | |
— | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | 3 |
Temp °C | 16 | 15 | 16 | 15 | 16 | 15 | 14 | 15 | 14 | 15 | 15 | 15 | 14 | 14 | 14 | 13 | 13 | 14 | 16 | 17 | 17 |
Feels °C | 11 | 11 | 11 | 11 | 14 | 13 | 13 | 13 | 11 | 12 | 11 | 11 | 7 | 8 | 9 | 10 | 10 | 11 | 10 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | WSW 15 | WSW 16 | WSW 16 | WSW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 16 | SW 16 | SW 14 | SW 13 | SW 16 | SW 14 | SW 13 | SW 13 | SW 12 | WSW 10 | WSW 14 | WSW 20 |
9915 | 10770 | 10064 | 7197 | 7196 | 6573 | 5538 | 5538 | 3659 | 4123 | 3283 | 2506 | 2904 | 5596 | 4401 | 3041 | 2075 | 1082 | 683 | 2848 | 412 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | SW 24 | SW 21 | SW 18 | — | — | WSW 20 | WSW 18 | — | — | — | — | WSW 18 | SW 16 | SSE 10 | SSE 9 |
— | — | — | — | — | — | 142 | 959 | 1947 | — | — | 152 | 842 | — | — | — | — | 33 | 358 | 10 | 8 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 12 | S 13 | S 12 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 13 | 11 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NNW 4 | NNW 5 | NW 6 | WSW 14 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 9 | 74 | 190 | 6481 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 2 | 35 | 2 | 1 | 0 | 0 | 1 | 0 | 2 | 2 | 2 | 89 | 35 | 0 | 0 | 89 | 0 | 211 | 53 | 220 |
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.











