Surf Forecasts:
The Window surf forecast from 17 Aug 2026:
- Best quality surf: Thursday 20 Aug, 2AM (local time) - 15ft (4.5m), 16s period, WSW swell with glassy winds.
- Most powerful swell: Tuesday 18 Aug, 5AM (local time) - 16ft (5.0m), 15s period, WSW swell with 11,039 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 2AM (local time) - 15ft (4.5m), 16s period with WSW 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 2AM. The primary swell is predicted to be 4.5m and 16s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at The Window in the next 16 days are 5.0m 15s and forecast to arrive on Tuesday (Aug 18) at 5AM. 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 (Thu 20th Aug) | 15ft (4.5m) 16s |
| Best Surf | 2AM (Thu 20th Aug) | 15ft (4.5m) 16s |
| Most Powerful | 5AM (Tue 18th Aug) | 16ft (5.0m) 15s |
Table - best surf conditions forecast for The Window over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s coming down the pipe for The Window. This is a real heavy-water reef setup, and it’s not for the faint of heart. We’ve got a solid run of swell, but the wind is going to be our biggest enemy for a lot of this stretch.
The pattern starts with a serious pulse of energy. Monday the 17th kicks things off with a massive 20ft swell from the WSW, carrying a huge amount of energy (9408). The problem? That’s accompanied by a strong 28 mph WSW wind, making it a cross-onshore mess. The water is sitting at 66°, which is a touch warmer than normal for this time of year. Don’t bother paddling out on Monday; it’s a kite-surfing session if anything.
Tuesday the 18th sees the swell drop a touch to 15ft, but wind is still a factor. The morning is a bit of a question mark with a moderate 12 mph onshore wind, and the afternoon goes cross-onshore with 16 mph. The period stretches to 16 seconds, so there’s some serious groundswell energy, but the surface is going to be choppy.
Wednesday the 19th is where things start to look a little more promising. The morning has rain showers and a gentle 9 mph onshore breeze. Keep an eye on the afternoon though – it’s looking clear with that same gentle breeze coming straight onshore, which is a solid improvement. The swell is 15ft with a 16-second period and a massive energy spike (9864). It’s still a big wave, but the conditions are trending better.
Thursday the 20th is a bit of a step back. The swell is down to 13ft, but the wind is light and cross-onshore, leaving the surface fairly choppy. Not great.
Now, here’s the standout window. Friday the 21st morning is the one to circle. The swell drops to 10ft from the SW with a 14-second period, but the wind goes completely glassy. That’s a major positive. This will be excellent surf for experienced surfers. The energy is still substantial (4336), but the clean conditions will make this reef line up beautifully. The Window is a fairly consistent spot, and it’s sometimes crowded, so expect company for this one.
Saturday the 22nd morning is also worth a mention. Another glassy period with 10ft swell from the SW and a long 16-second period. The energy is a bit lower (3953), but the clean conditions are a big draw. The Window can be a bit of a paddle for the long period stuff, but it’s a point/reef, so it handles the groundswell well.
The rest of the week into the next is a mixed bag. Sunday the 23rd and Monday the 24th are mostly blown out or marginal. The wind gets messy again.
Looking further out, we’ve got a few promising windows. On the morning of Thursday the 27th, the swell is 8ft from the WSW, and the wind is calm and glassy. That’s excellent for experienced surfers again. Then Friday the 28th afternoon is looking clean with a light offshore breeze and 10ft from the SW. The energy is moderate (4364), and the conditions are clean. That’s a good shout for a late session.
The final weekend of the 30th and 31st gets messy again with strong winds and a building swell, so the window closes out with some challenging conditions. The first of September looks like a big, windy, blown-out mess with 16ft swell and gale-force winds.
Overall, the best bet is Friday the 21st morning for the combination of size and glassy conditions. The morning of the 27th is another solid, cleaner option for the second week, though it’s a bit further out so less certain.
Rusty out.
Short Range ForecastLight rain (total 5mm), mostly falling on Wed morning. Very mild (max 16°C on Tue night, min 14°C on Mon night). Winds decreasing (strong winds from the WSW on Mon night, light winds from the WNW by Wed night). | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Sat night. Very mild (max 18°C on Sat afternoon, min 13°C on Thu night). Winds increasing (calm on Fri morning, strong winds from the WSW by Sun morning). | ||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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 15 | WSW 15 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 16 | SW 16 | WSW 14 | WSW 14 | WSW 14 | WSW 13 |
Wave Graph | |||||||||||||||||||
11009 | 10173 | 8820 | 6324 | 8083 | 9739 | 9256 | 7008 | 6308 | 5659 | 4281 | 3665 | 3017 | 4181 | 3340 | 2151 | 1349 | 3789 | 2553 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | on | on | cross-on | glassy | cross-on | cross-on | glassy | glassy | cross-on | off | cross-off | cross | on | cross-on | cross-on | cross-on |
High Tide | 00:24AM0.53m | 00:40AM0.57m | 1:23AM0.59m | 3:49AM0.60m | 5:28AM0.62m | 6:30AM0.65m | |||||||||||||
Low Tide | 3:20PM0.22m | 3:07PM0.17m | 3:18PM0.13m | 3:36PM0.10m | 3:55PM0.08m | 4:15PM0.07m | |||||||||||||
— | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:50 | — | — | 6:50 | — | — | |
5:51 | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | |
mm | — | — | — | 2 | 2 | — | — | 1 | — | — | — | — | — | — | — | 3 | 1 | — | 1 |
Temp °C | 14 | 15 | 15 | 16 | 16 | 16 | 15 | 15 | 16 | 15 | 14 | 15 | 14 | 17 | 18 | 18 | 16 | 15 | 15 |
Feels °C | 4 | 10 | 10 | 10 | 12 | 13 | 12 | 13 | 13 | 13 | 14 | 13 | 10 | 14 | 17 | 17 | 9 | 8 | 10 |
Swell 1 Height (m) Direction Period (s) | WSW 15 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 16 | SW 16 | WSW 14 | WSW 14 | WSW 14 | WSW 13 |
11009 | 10173 | 8820 | 6324 | 8083 | 9739 | 9256 | 7008 | 6308 | 5659 | 4281 | 3665 | 3017 | 4181 | 3340 | 2151 | 1349 | 3789 | 2553 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | WSW 24 | SW 22 | SW 18 | — | — | WSW 18 | WSW 16 | — | — |
— | — | — | — | — | — | — | — | — | — | 55 | 227 | 1283 | — | — | 263 | 597 | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | N 4 | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WNW 4 | SW 8 | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 29 | 530 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 576 | 363 | 213 | 260 | 15 | 15 | 0 | 3 | 3 | 0 | 0 | 3 | 0 | 14 | 21 | 171 | 363 | 15 | 15 |
Best forecast wave conditions in Margaret River | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.











