Surf Forecasts:
The Window surf forecast from 18 Aug 2026:
- Best quality surf: Saturday 22 Aug, 2AM (local time) - 11ft (3.5m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 19 Aug, 5PM (local time) - 15ft (4.5m), 16s period, WSW swell with 9,944 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 11PM (local time) - 11ft (3.5m), 15s period with SW swell.
Best Forecast Surf Conditions for The Window this week:
The surf forecast for The Window 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 3.5m and 15s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at The Window in the next 16 days are 4.5m 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+) | 11PM (Thu 20th Aug) | 11ft (3.5m) 15s |
| Best Surf | 2AM (Sat 22nd Aug) | 11ft (3.5m) 17s |
| Most Powerful | 5PM (Wed 19th Aug) | 15ft (4.5m) 16s |
Table - best surf conditions forecast for The Window over the next 16 days.
The Lowdown
Alright, grab your board, let’s get into it. This is Rusty, and I’m looking at a solid 16-day window for The Window.
Right off the bat, we’ve got a serious pulse of energy hitting the reef. The window opens on Tuesday the 18th of August, but don’t get too excited just yet. The swell is a thumping 15ft from the WSW with a very long 16-second period, and the combined energy is pumping at a massive 8820 (strong to very strong wave energy). The problem is, the wind is ripping from the NW at 16 mph, making it a messy cross-on. The water is a touch warmer than normal at 66°, which is a little unusual for this time of year. Conditions are poor, so you’re better off taking a look and waiting.
Wednesday the 19th is more of the same: big 15ft swell, long period, and cross-on winds. The Window is a reef break, so it can handle swell, but the wind is just chopping it up. Thursday the 20th sees the swell drop a touch to 13ft, still with a 16-second period, but the wind eases to a gentle breeze. It’s still cross-on, so we’re looking at “marginal” conditions.
Now, Friday the 21st of August is where it gets interesting. The morning session is looking like a genuine standout. Swell is still a hefty 12ft from the WSW, with a 14-second period, and the combined energy is very strong at 5010. But the wind goes glassy – a light easterly breeze at just 3 mph. The report says “excellent surf conditions for experienced surfers.” This is the pick of the first week. The Window is a reef break, and with that long-period groundswell, it’s going to be firing, but it’s steep and powerful, so only for the crew who know what they’re doing. The afternoon sees the wind shift, so the morning is the window.
Saturday the 22nd and Sunday the 23rd are still in the 8ft to 10ft range, but the wind is cross-shore or cross-on, keeping the quality down. Monday the 24th is a write-off with strong cross-on wind.
There’s a massive gap after that. The next sniff of quality doesn’t come until Wednesday the 26th of August. The afternoon session shows a 15ft swell from the SW, 15-second period, and the wind drops to a gentle cross-shore breeze. The energy is back up to 8628 (very strong). It’s rated as “marginal,” but it’s a step up from the garbage before it.
The real second chance comes on Thursday the 27th of August. The morning has a 12ft swell from the SW, 13-second period, and the wind is offshore from the ENE at 9 mph. The report says “excellent surf conditions for experienced surfers.” The afternoon is also clean with a 10ft swell. This is your second standout. The Window is a reef, and with that offshore wind, it should be holding a nice line.
The rest of the run into the first week of September is a mixed bag. Friday the 28th and Saturday the 29th are smaller and choppy. Monday the 31st of August has a clean morning with a 8ft swell and light cross-off wind, a solid option for the more experienced.
The last real stand-out is Wednesday the 2nd of September. The morning shows a 12ft swell from the WSW, 15-second period, and the wind is cross-off at 9 mph. The energy is 4893 (strong), and the report says “excellent surf conditions for experienced surfers.” This is a promising long-range call, but it’s a bit far out, so keep your fingers crossed it holds.
Overall, the best waves are for the experienced crew. The standouts are the morning of Friday the 21st of August (glassy, 12ft WSW) and the morning of Thursday the 27th of August (offshore, 12ft SW). The Window is a reef, so it can handle the size, but it gets critical. Crowds are possible there, so be ready to share. If you’re a beginner, stay out of the water when it’s over 8ft, which is most of this forecast.
Rusty.
Short Range ForecastLight rain (total 3mm), 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 W on Tue night, calm by Fri morning). | Days 5-7 Weather SummarySome drizzle, heaviest during Sun morning. Very mild (max 17°C on Mon afternoon, min 9°C on Mon morning). Wind will be generally light. | ||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 15 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | SW 15 | SW 15 | SW 17 | SW 16 | SW 16 | SW 14 | SW 13 | SW 13 | WSW 15 | WSW 14 | SW 12 | SW 13 |
Wave Graph | |||||||||||||||||||
6238 | 8590 | 9944 | 9256 | 6829 | 6494 | 6085 | 5187 | 5187 | 6625 | 3953 | 3137 | 2125 | 2719 | 2107 | 4431 | 2898 | 1624 | 1230 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | on | cross-on | cross-on | cross-off | off | cross-on | cross-off | cross | cross-on | cross | cross | cross | off | cross-off | cross-on | cross-on |
High Tide | 00:40AM0.57m | 1:23AM0.59m | 3:49AM0.60m | 5:28AM0.62m | 6:30AM0.65m | 7:16AM0.68m | |||||||||||||
Low Tide | 3:07PM0.17m | 3:18PM0.13m | 3:36PM0.10m | 3:55PM0.08m | 4:15PM0.07m | 4:34PM0.07m | |||||||||||||
— | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:50 | — | — | 6:50 | — | — | 6:48 | — | — | |
5:52 | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — | |
mm | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — |
Temp °C | 16 | 16 | 15 | 16 | 16 | 15 | 15 | 14 | 15 | 14 | 15 | 15 | 16 | 14 | 15 | 13 | 13 | 17 | 16 |
Feels °C | 9 | 10 | 11 | 12 | 13 | 12 | 12 | 13 | 14 | 11 | 11 | 10 | 12 | 9 | 9 | 9 | 9 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | — | WSW 15 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | SW 15 | SW 15 | SW 17 | SW 16 | SW 16 | SW 14 | SW 13 | SW 13 | WSW 15 | WSW 14 | SW 12 | SW 13 |
— | 8590 | 9944 | 9256 | 6829 | 6494 | 6085 | 5187 | 5187 | 6625 | 3953 | 3137 | 2125 | 2719 | 2107 | 4431 | 2898 | 1624 | 1230 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | SW 24 | — | SW 18 | — | — | WSW 20 | WSW 18 | WSW 17 | — | SW 12 | — | SSW 10 |
— | — | — | — | — | — | — | 142 | — | 1925 | — | — | 136 | 578 | 1462 | — | 353 | — | 112 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | WSW 15 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
6238 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 231 | 15 | 15 | 74 | 3 | 3 | 0 | 0 | 3 | 0 | 3 | 15 | 3 | 3 | 3 | 0 | 69 | 69 | 156 |
Best forecast wave conditions in Margaret River | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
Header Global | |||||||||||||||||||
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Information about the The Window Surf forecast
The above surf forecast table for The Window provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at The Window can be found by selecting the local surf guide option on the grey menu. Our The Window 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 (The Window) 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 The Window 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.
The Window is 74 km (46 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.











