Surf Forecasts:
Margaret River Mouth surf forecast from 18 Aug 2026:
- Best quality surf: Friday 21 Aug, 2AM (local time) - 6ft (1.9m), 15s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 19 Aug, 5PM (local time) - 8ft (2.4m), 16s period, WSW swell with 2,791 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 2AM (local time) - 6ft (1.9m), 15s period with SW swell.
Best Forecast Surf Conditions for Margaret River Mouth this week:
The surf forecast for Margaret River Mouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 2AM. The primary swell is predicted to be 1.9m and 15s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Margaret River Mouth in the next 16 days are 2.4m 16s and forecast to arrive on Wednesday (Aug 19) at 5PM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Fri 21st Aug) | 6ft (1.9m) 15s |
| Best Surf | 2AM (Fri 21st Aug) | 6ft (1.9m) 15s |
| Most Powerful | 5PM (Wed 19th Aug) | 8ft (2.4m) 16s |
Table - best surf conditions forecast for Margaret River Mouth over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about the Margaret River Mouth stretch for the next couple of weeks.
Right off the bat, it’s a mixed bag. The water temp is 67°, which is a touch warmer than you’d usually expect for this time of year – a nice little bonus if you’re paddling out without a thick wetsuit. The main story is a long, solid pulse of WSW groundswell with a very long period of 16 seconds, pushing through the middle of the week with strong energy (2780). That kind of period is classic for a river mouth setup – it’ll wrap in and offer up some proper lines, but it’s also a big, powerful swell that can move fast. The wind is the issue though. Tuesday morning kicks off with a 8ft WSW swell, but it’s coming with a 9 mph WNW breeze blowing onshore, making it lumpy. Tuesday arvo is a write-off with 19 mph NW wind. Wednesday and Thursday see the swell staying solid, from 8ft to 7ft, but the wind is cross-onshore, keeping things on the choppy side. Not the best for a beginner – anything over 5ft and it’s starting to get punchy, and this is well above that.
The real highlight, and the standout session, looks like Friday morning on the 21st. The swell drops slightly to 6ft, still from the SW with a 14-second period, but the wind goes glassy – 3 mph from the WSW. That’s the magic window. The river mouth will be clean, that long-period swell will be offering up some sweet, lined-up waves. It’s a solid, fun size, not too big, and the energy is still moderate (1329). The crowds are *sometimes* an issue here, but on a Friday morning with that glass, it’s worth the paddle. Saturday morning the 22nd is also looking glassy with a 5ft SW swell, but a bit smaller. Still a very good option.
The second week gets a bit more interesting again, but it’s less certain. There’s a big spike late on Sunday the 30th and into the 31st, with a 10ft WSW swell on Monday the 31st and massive energy (3944). That’s a beast, and it’s only for experienced surfers at that size – way too big for beginners. The wind is cross-onshore, so it’ll be a messy, powerful beast. The Saturday the 29th has a late arvo glass-off with a 5ft swell – clean and fun for a paddle. The very end of the run, on the 1st of September, has a 8ft WSW swell with light offshore winds, which is promising, but it’s a long-range call.
Overall, the best bet is next Friday morning the 21st – glassy, clean, and a solid 6ft of SW groundswell. That’s the one to circle. If you want a bigger challenge, the 30th of August has a solid 7ft with clean conditions, but keep an eye on the wind updates.
Rusty out.
Short Range ForecastLight rain (total 4mm), mostly falling on Tue night. Very mild (max 16°C on Tue night, min 13°C on Thu night). Winds decreasing (fresh winds from the WNW on Tue night, calm by Thu night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 16°C on Sat night, min 12°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 16 | WSW 16 | WSW 15 | WSW 15 | WSW 16 | WSW 16 | WSW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | WSW 15 | WSW 14 | WSW 13 | WSW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2543 | 2170 | 1749 | 2446 | 2791 | 2419 | 1880 | 1822 | 1663 | 1325 | 1220 | 799 | 1087 | 939 | 589 | 680 | 479 | 897 | 621 | 408 | 520 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | glassy | glassy | cross-on | cross-off | cross | cross-on | cross-on | cross-on | cross | glassy | cross | cross-on | cross-on |
High Tide | 00:34AM0.58m | 1:16AM0.61m | 4:00AM0.61m | 5:40AM0.64m | 6:41AM0.67m | 7:27AM0.70m | |||||||||||||||
Low Tide | 3:16PM0.22m | 3:12PM0.16m | 3:26PM0.12m | 3:44PM0.10m | 4:03PM0.08m | 4:23PM0.07m | 4:42PM0.08m | ||||||||||||||
 |  |  | | |  | | |  |  | |  | | | | | | | | | | |
 | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | 6:48 | — | — |
 | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — |
mm | — | — | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 |
Temp °C | 15 | 15 | 16 | 16 | 15 | 15 | 15 | 16 | 16 | 14 | 14 | 14 | 15 | 15 | 16 | 15 | 15 | 15 | 14 | 15 | 16 |
Feels °C | 10 | 10 | 8 | 11 | 11 | 9 | 11 | 13 | 14 | 13 | 11 | 12 | 13 | 11 | 12 | 10 | 10 | 11 | 10 | 10 | 9 |
Swell 1 Height (m) Direction Period (s) | WSW 16 | WSW 16 | — | WSW 15 | WSW 16 | WSW 16 | WSW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | WSW 15 | WSW 14 | WSW 13 | S 10 |
| kJ | 2543 | 2170 | — | 2446 | 2791 | 2419 | 1880 | 1822 | 1663 | 1325 | 1220 | 799 | 1087 | 939 | 589 | 680 | 479 | 897 | 621 | 408 | 17 |
Swell 2 Height (m) Direction Period (s) | SW 16 | — | — | — | — | — | — | — | — | SW 24 | SW 20 | SW 17 | — | — | WSW 20 | WSW 18 | WSW 16 | S 10 | — | SSW 10 | SW 16 |
| kJ | 165 | — | — | — | — | — | — | — | — | 22 | 202 | 594 | — | — | 41 | 180 | 385 | 2 | — | 20 | 10 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | WSW 15 | — | — | — | — | — | — | — | — | — | — | — | WSW 5 | — | — | — | — | NW 4 | WSW 13 |
| kJ | — | — | 1749 | — | — | — | — | — | — | — | — | — | — | — | 15 | — | — | — | — | 9 | 520 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 245 | 194 | 214 | 12 | 12 | 93 | 12 | 12 | 0 | 0 | 12 | 0 | 12 | 1688 | 12 | 12 | 31 | 0 | 43 | 43 | 273 |
Best forecast wave conditions in Margaret River | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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Information about the Margaret River Mouth Surf forecast
The above surf forecast table for Margaret River Mouth provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Margaret River Mouth can be found by selecting the local surf guide option on the grey menu. Our Margaret River Mouth 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 (Margaret River Mouth) 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 Margaret River Mouth 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.
Margaret River Mouth is 92 km (57 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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