Surf Forecasts:
The Window surf forecast from 20 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 11AM (local time) - 16ft (5.0m), 18s period, WSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 26 Aug, 8AM (local time) - 16ft (5.0m), 19s period, WSW swell with 16,863 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 2AM (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 Friday (Aug 21) at 2AM. The primary swell is predicted to be 3.5m and 15s 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 19s and forecast to arrive on Wednesday (Aug 26) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Fri 21st Aug) | 11ft (3.5m) 15s |
| Best Surf | 11AM (Wed 26th Aug) | 16ft (5.0m) 18s |
| Most Powerful | 8AM (Wed 26th Aug) | 16ft (5.0m) 19s |
Table - best surf conditions forecast for The Window over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get stuck into the outlook for The Window. The window is a reef break that handles a good SW swell and is pretty exposed. It’s an advanced wave, so it’s not for the faint-hearted.
The week kicks off with a bit of a wait. The Window is a fairly consistent spot, so we’ll get waves, but the first few days are a mixed bag.
Thursday afternoon (August 20th) is a bit of a write-off. We’ve got a solid 12ft of WSW swell, with a very long period of 16 seconds, so there’s heaps of energy (6308) in the water. But the wind is a dirty cross-on from the SW at 9 mph, and it’s choppy. The water is 66°F, which is a touch warmer than normal for this time of year. Not a great start.
Now, Friday morning (August 21st) is the standout of the early period. The swell holds at 12ft from the SW, period drops a touch to 14 seconds, but the wind switches to a clean SE cross-off at just 3 mph. It’s glassy, it’s clean. This is the one to get on. The combined energy is still chunky (4862), and it’s a proper groundswell. For an advanced spot like The Window, this is premium. The afternoon gets a bit onshore and choppy again, so make the morning session.
Saturday (August 22nd) and Sunday (August 23rd) see the swell drop a bit, but the wind stays cross or cross-shore, keeping things choppy and marginal. The conditions are just not clean enough to get excited about, even though the swell size is still solid.
Monday (August 24th) offers a glimmer with a light NW breeze, but it’s still cross-on, so you’ll be dealing with some wind ripple. The swell is 10ft from the WSW with a 13-second period (2820 energy). It’s okay, but not electric.
We hit a rough patch from Tuesday (August 25th) through to Friday (August 28th) morning. The wind goes cross-on from the NW, and the ocean gets lumpy and choppy. Even though there’s plenty of swell, the quality is poor. Not worth paddling out for.
Now, here’s where it gets interesting. Wednesday (August 26th) is a monster. The swell jumps to 18ft from the WSW with a period of 19 seconds. That’s an enormous groundswell, and the combined energy hits 18892. That’s serious power. The wind is a moderate cross-shore (S at 12 mph), so it’s going to be a bumpy beast. The afternoon cleans up with a cross-off wind, but at 16ft, this is only for the experts. Thursday (August 27th) stays oversized with 16ft to 15ft swell and clean cross-off winds, but again, this is heavy, heavy water. If you’re not charging, stay on the beach.
The end of the week (Friday August 28th) and into Saturday (August 29th) sees the swell drop back to a more manageable 10ft and then 5ft. Saturday morning (August 29th) looks like a winner with a light NE cross-off breeze at 6 mph, clean conditions, and a 5ft WSW swell. That’s a fun size for advanced surfers, and the energy is low (1248), so it’s not as intimidating.
The first week of September is a write-off. The wind is predominantly onshore or cross-on, and the swell is big but messy. Sunday (August 30th) through to Wednesday (September 3rd) is all poor surf conditions with moderate to fresh cross-onshore winds and lumpy, choppy seas. Not worth it.
The best of the best is Friday morning (August 21st) for the clean, glassy conditions with a solid 12ft SW groundswell and that crisp cross-off wind. The second best is Saturday morning (August 29th) for a cleaner, smaller wave. The big stuff on the 26th and 27th is a spectacle, but it’s for the brave only.
Rusty out.
Short Range ForecastSome drizzle, heaviest during Sun morning. Very mild (max 16°C on Thu night, min 12°C on Fri night). Winds increasing (calm on Fri morning, fresh winds from the SSW by Sat afternoon). | Days 5-7 Weather SummaryModerate rain (total 14mm), heaviest on Tue night. Very mild (max 17°C on Tue night, min 11°C on Sun night). Winds increasing (light winds from the ESE on Sun night, fresh winds from the NW by Tue night). | ||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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) | SW 15 | SW 14 | SW 14 | WSW 18 | SW 16 | SW 16 | SW 14 | SW 13 | SW 13 | WSW 15 | WSW 14 | SW 13 | WSW 12 | WSW 11 | WSW 14 | WSW 15 | WSW 18 | WSW 17 | SW 16 |
Wave Graph  | |||||||||||||||||||
 kJ | 5735 | 4720 | 4881 | 2603 | 3953 | 3439 | 1891 | 2318 | 2310 | 5270 | 3148 | 2207 | 1498 | 1328 | 3200 | 6228 | 16542 | 14396 | 11294 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | cross | cross-off | cross | cross | cross | cross | cross | cross-off | cross-off | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off | cross | cross-off |
High Tide | 3:49AM0.60m | 5:28AM0.62m | 6:30AM0.65m | 7:16AM0.68m | 7:56AM0.70m | 8:31AM0.71m | |||||||||||||
Low Tide | 3:36PM0.10m | 3:55PM0.08m | 4:15PM0.07m | 4:34PM0.07m | 4:51PM0.09m | 5:03PM0.11m | |||||||||||||
 |  |  |  | |  | |  | | | | | | | |  |  | |  | |
 | — | 6:52 | — | — | 6:50 | — | — | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — | 6:47 | — | — |
 | 5:52 | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — | — | 5:57 | — | — | 5:57 | — |
mm | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | 9 | 3 | 2 | 1 |
Temp °C | 16 | 15 | 16 | 14 | 15 | 15 | 15 | 14 | 14 | 13 | 12 | 13 | 16 | 16 | 16 | 17 | 14 | 15 | 13 |
Feels °C | 13 | 14 | 14 | 10 | 12 | 9 | 11 | 9 | 8 | 9 | 9 | 10 | 11 | 10 | 10 | 11 | 11 | 12 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 14 | SW 14 | SW 14 | SW 16 | SW 16 | SW 14 | SW 13 | SW 13 | WSW 15 | WSW 14 | SW 13 | WSW 12 | WSW 11 | WSW 14 | WSW 15 | WSW 18 | WSW 17 | SW 16 |
| kJ | 5735 | 4720 | 4881 | 2603 | 3953 | 3439 | 1891 | 2318 | 2310 | 5270 | 3148 | 2207 | 1498 | 1328 | 3200 | 6228 | 16542 | 14396 | 11294 |
Swell 2 Height (m) Direction Period (s) | — | SW 24 | SW 20 | WSW 18 | — | — | WSW 20 | WSW 18 | WSW 16 | — | — | — | SW 15 | SW 16 | — | SW 24 | — | — | — |
| kJ | — | 142 | 1261 | 2490 | — | — | 75 | 360 | 1647 | — | — | — | 171 | 521 | — | 278 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | SW 18 | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 150 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NNW 4 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 16 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 3 | 0 | 3 | 414 | 3 | 3 | 1688 | 0 | 0 | 213 | 69 | 194 | 260 | 15 | 0 | 3 | 16 |
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.
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